1
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Zhao X, Alsufyani M, Tian J, Lin Y, Jeong SY, Han YW, Yin Y, McCulloch I. High Efficiency n-Type Doping of Organic Semiconductors by Cation Exchange. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024:e2412811. [PMID: 39385648 DOI: 10.1002/adma.202412811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2024] [Revised: 09/16/2024] [Indexed: 10/12/2024]
Abstract
Achieving efficient doping in n-type conjugated polymers is crucial for their application in electronic devices. In this study, an n-type doping method is developed based on cation exchange that maintains a high doping level while ensuring a high degree of structural order, leading to significantly improved electrical conductivity. By investigating various dopants and ionic liquids, it is discovered that the choice of dopant influences doping efficiency, while the selection of ionic liquid affects cation exchange efficiency. Through careful selection of suitable dopants and ionic liquids, High doping levels are achieved remarkably in a short period, resulting in the highest conductivity (nearly 1 × 10- 2 S cm-¹) compared to other doping methods for poly{[N,N'-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5'-(2,2'-bithiophene)} (N2200). The findings highlight the robustness and efficiency of cation exchange doping as an effective approach for achieving high-quality n-type doping in conjugated polymers, thereby opening new avenues for the development of advanced polymer-based electronic devices.
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Affiliation(s)
- Xiaolei Zhao
- Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
- Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK
| | - Maryam Alsufyani
- Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK
| | - Junfu Tian
- Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK
| | - Yuanbao Lin
- Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK
| | - Sang Young Jeong
- Department of Chemistry, Korea University, Seoul, 02841, Republic of Korea
| | - Young Woo Han
- Department of Chemistry, Korea University, Seoul, 02841, Republic of Korea
| | - Yi Yin
- Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Iain McCulloch
- Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK
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2
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Farka D, Ciganek M, Veselý D, Kalina L, Krajčovič J. Epitaxial Guidance of Adamantyl-Substituted Polythiophenes by Self-Assembled Monolayers. ACS OMEGA 2024; 9:38733-38742. [PMID: 39310142 PMCID: PMC11411674 DOI: 10.1021/acsomega.4c04616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/15/2024] [Revised: 08/20/2024] [Accepted: 08/26/2024] [Indexed: 09/25/2024]
Abstract
The anisotropic nature of charge transport through organic materials requires high control over the self-assembly of the organic materials. This is particularly so for conductive polymers, where transport occurs mainly along the polymers' backbone. Herein, we demonstrate the use of self-assembled monolayers (SAMs) to influence the self-assembly of poly(3-adamantylmethylthiophene). We employ two different SAMs, which interact with either the adamantyl- or the thiophene-functionality, respectively, and acquire distinct topologies as compared to the unmodified Au(111) surface. We compare these results with unmodified glass and mica (muscovite) surfaces, which are typically employed in the field of optoelectronics. We prove the usefulness and applicability of epitaxial effects and adamantyl substituents for organic electronics. This presents a viable way toward improved electronic performance for the field as a whole.
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Affiliation(s)
- Dominik Farka
- Institute
of Organic Chemistry and Biochemistry (IOCB), Czech Academy of Sciences, Flemingovo Náměstí 2, Prague 160 00, Czech Republic
| | - Martin Ciganek
- Faculty
of Chemistry, Brno University of Technology
(BUT), Purkyňova
118, Brno CZ-612 00, Czech Republic
| | - Dominik Veselý
- Faculty
of Chemistry, Brno University of Technology
(BUT), Purkyňova
118, Brno CZ-612 00, Czech Republic
| | - Lukáš Kalina
- Faculty
of Chemistry, Brno University of Technology
(BUT), Purkyňova
118, Brno CZ-612 00, Czech Republic
| | - Jozef Krajčovič
- Faculty
of Chemistry, Brno University of Technology
(BUT), Purkyňova
118, Brno CZ-612 00, Czech Republic
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3
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Wu Y, Salamat CZ, León Ruiz A, Simafranca AF, Akmanşen-Kalayci N, Wu EC, Doud E, Mehmedović Z, Lindemuth JR, Phan MD, Spokoyny AM, Schwartz BJ, Tolbert SH. Using Bulky Dodecaborane-Based Dopants to Produce Mobile Charge Carriers in Amorphous Semiconducting Polymers. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2024; 36:5552-5562. [PMID: 38883433 PMCID: PMC11171275 DOI: 10.1021/acs.chemmater.4c00502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 04/19/2024] [Accepted: 04/22/2024] [Indexed: 06/18/2024]
Abstract
Conjugated polymers are a versatile class of electronic materials featured in a variety of next-generation electronic devices. The utility of such polymers is contingent in large part on their electrical conductivity, which depends both on the density of charge carriers (polarons) and on the carrier mobility. Carrier mobility, in turn, is largely controlled by the separation between the polarons and dopant counterions, as counterions can produce Coulombic traps. In previous work, we showed that large dopants based on dodecaborane (DDB) clusters were able to reduce Coulombic binding and thus increase carrier mobility in regioregular (RR) poly(3-hexylthiophene-2,5-diyl) (P3HT). Here, we use a DDB-based dopant to study the effects of polaron-counterion separation in chemically doped regiorandom (RRa) P3HT, which is highly amorphous. X-ray scattering shows that the DDB dopants, despite their large size, can partially order the RRa P3HT during doping and produce a doped polymer crystal structure similar to that of DDB-doped RR P3HT; Alternating Field (AC) Hall measurements also confirm a similar hole mobility. We also show that use of the large DDB dopants successfully reduces Coulombic binding of polarons and counterions in amorphous polymer regions, resulting in a 77% doping efficiency in RRa P3HT films. The DDB dopants are able to produce RRa P3HT films with a 4.92 S/cm conductivity, a value that is ∼200× higher than that achieved with 3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ), the traditional dopant molecule. These results show that tailoring dopants to produce mobile carriers in both the amorphous and semicrystalline regions of conjugated polymers is an effective strategy for increasing achievable polymer conductivities, particularly in low-cost polymers with random regiochemistry. The results also emphasize the importance of dopant size and shape for producing Coulombically unbound, mobile polarons capable of electrical conduction in less-ordered materials.
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Affiliation(s)
- Yutong Wu
- Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1569, United States
| | - Charlene Z Salamat
- Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1569, United States
| | - Alex León Ruiz
- Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1569, United States
| | - Alexander F Simafranca
- Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1569, United States
| | - Nesibe Akmanşen-Kalayci
- Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1569, United States
| | - Eric C Wu
- Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1569, United States
| | - Evan Doud
- Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1569, United States
| | - Zerina Mehmedović
- Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1569, United States
| | | | - Minh D Phan
- Center for Neutron Science, Department of Chemical and Biochemical Engineering, University of Delaware, Newark, Delaware 19716, United States
| | - Alexander M Spokoyny
- Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1569, United States
| | - Benjamin J Schwartz
- Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1569, United States
| | - Sarah H Tolbert
- Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1569, United States
- Department of Materials Science and Engineering, University of California Los Angeles, Los Angeles, California 90095-1595, United States
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4
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Wang S, Zhu W, Jacobs IE, Wood WA, Wang Z, Manikandan S, Andreasen JW, Un HI, Ursel S, Peralta S, Guan S, Grivel JC, Longuemart S, Sirringhaus H. Enhancing the Thermoelectric Properties of Conjugated Polymers by Suppressing Dopant-Induced Disorder. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2314062. [PMID: 38558210 DOI: 10.1002/adma.202314062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 03/17/2024] [Indexed: 04/04/2024]
Abstract
Doping is a crucial strategy to enhance the performance of various organic electronic devices. However, in many cases, the random distribution of dopants in conjugated polymers leads to the disruption of the polymer microstructure, severely constraining the achievable performance of electronic devices. Here, it is shown that by ion-exchange doping polythiophene-based P[(3HT)1-x-stat-(T)x] (x = 0 (P1), 0.12 (P2), 0.24 (P3), and 0.36 (P4)), remarkably high electrical conductivity of >400 S cm-1 and power factor of >16 µW m-1 K-2 are achieved for the random copolymer P3, ranking it among highest ever reported for unaligned P3HT-based films, significantly higher than that of P1 (<40 S cm-1, <4 µW m-1 K-2). Although both polymers exhibit comparable field-effect transistor hole mobilities of ≈0.1 cm2 V-1 s-1 in the pristine state, after doping, Hall effect measurements indicate that P3 exhibits a large Hall mobility up to 1.2 cm2 V-1 s-1, significantly outperforming that of P1 (0.06 cm2 V-1 s-1). GIWAXS measurement determines that the in-plane π-π stacking distance of doped P3 is 3.44 Å, distinctly shorter than that of doped P1 (3.68 Å). These findings contribute to resolving the long-standing dopant-induced-disorder issues in P3HT and serve as an example for achieving fast charge transport in highly doped polymers for efficient electronics.
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Affiliation(s)
- Suhao Wang
- Optoelectronics Group, Cavendish Laboratory, JJ Thomson Avenue, Cambridge, CB3 0HE, UK
- Unité de Dynamique et Structure des Matériaux Moléculaires, Université du Littoral Côte d'Opale, 145 Avenue Maurice Schumann, Dunkerque, 59140, France
| | - Wenjin Zhu
- Optoelectronics Group, Cavendish Laboratory, JJ Thomson Avenue, Cambridge, CB3 0HE, UK
| | - Ian E Jacobs
- Optoelectronics Group, Cavendish Laboratory, JJ Thomson Avenue, Cambridge, CB3 0HE, UK
| | - William A Wood
- Optoelectronics Group, Cavendish Laboratory, JJ Thomson Avenue, Cambridge, CB3 0HE, UK
| | - Zichen Wang
- Optoelectronics Group, Cavendish Laboratory, JJ Thomson Avenue, Cambridge, CB3 0HE, UK
| | - Suraj Manikandan
- Department of Energy Conversion and Storage, Technical University of Denmark, Kongens Lyngby, 2800, Denmark
| | - Jens Wenzel Andreasen
- Department of Energy Conversion and Storage, Technical University of Denmark, Kongens Lyngby, 2800, Denmark
| | - Hio-Ieng Un
- Optoelectronics Group, Cavendish Laboratory, JJ Thomson Avenue, Cambridge, CB3 0HE, UK
| | - Sarah Ursel
- Optoelectronics Group, Cavendish Laboratory, JJ Thomson Avenue, Cambridge, CB3 0HE, UK
| | - Sébastien Peralta
- Laboratoire de Physicochimie des Polymères et des Interfaces, CY Cergy Paris Université, 5 Mail Gay Lussac, Neuville-sur-Oise, 95000, France
| | - Shaoliang Guan
- Maxwell Centre, Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, UK
| | - Jean-Claude Grivel
- Department of Energy Conversion and Storage, Technical University of Denmark, Kongens Lyngby, 2800, Denmark
| | - Stéphane Longuemart
- Unité de Dynamique et Structure des Matériaux Moléculaires, Université du Littoral Côte d'Opale, 145 Avenue Maurice Schumann, Dunkerque, 59140, France
| | - Henning Sirringhaus
- Optoelectronics Group, Cavendish Laboratory, JJ Thomson Avenue, Cambridge, CB3 0HE, UK
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5
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Guo J, Chen PA, Yang S, Wei H, Liu Y, Xia J, Chen C, Chen H, Wang S, Li W, Hu Y. Dopant-induced Morphology of Organic Semiconductors Resulting in High Doping Performance. SMALL METHODS 2024:e2400084. [PMID: 38738733 DOI: 10.1002/smtd.202400084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 04/21/2024] [Indexed: 05/14/2024]
Abstract
Doping plays a crucial role in modulating and enhancing the performance of organic semiconductor (OSC) devices. In this study, the critical role of dopants is underscored in shaping the morphology and structure of OSC films, which in turn profoundly influences their properties. Two dopants, trityl tetrakis(pentafluorophenyl) (TrTPFB) and N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate (DMA-TPFB), are examined for their doping effects on poly(3-hexylthiophene) (P3HT) and PBBT-2T host OSCs. It is found that although TrTPFB exhibits higher doping efficiency, OSCs doped with DMA-TPFB achieve comparable or even enhanced electrical conductivity. Indeed, the electrical conductivity of DMA-TPFB-doped P3HT reaches over 67 S cm-1, which is a record-high value for mixed-solution-doped P3HT. This can be attributed to DMA-TPFB inducing a higher degree of crystallinity and reduced structural disorder. Moreover, the beneficial impact of DMA-TPFB on the OSC films' morphology and structure results in superior thermoelectric performance in the doped OSCs. These findings highlight the significance of dopant-induced morphological and structural considerations in enhancing the film characteristics of OSCs, opening up a new avenue for optimization of dopant performance.
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Affiliation(s)
- Jing Guo
- Changsha Semiconductor Technology and Application Innovation Research Institute, College of Semiconductors (College of Integrated Circuits), Hunan University, Changsha, 410082, China
- School of Physics and Information Engineering, Shanxi Normal University, Taiyuan, 031000, China
| | - Ping-An Chen
- Changsha Semiconductor Technology and Application Innovation Research Institute, College of Semiconductors (College of Integrated Circuits), Hunan University, Changsha, 410082, China
- Shenzhen Research Institute of Hunan University, Shenzhen, 518063, China
- International Science and Technology Innovation Cooperation Base for Advanced Display Technologies of Hunan Province, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Shuzhang Yang
- Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception, Institute of Optoelectronics, Department of Materials Science, Fudan University, Shanghai, 200433, China
| | - Huan Wei
- Shenzhen Research Institute of Hunan University, Shenzhen, 518063, China
- International Science and Technology Innovation Cooperation Base for Advanced Display Technologies of Hunan Province, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Yu Liu
- Shenzhen Research Institute of Hunan University, Shenzhen, 518063, China
- International Science and Technology Innovation Cooperation Base for Advanced Display Technologies of Hunan Province, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Jiangnan Xia
- Shenzhen Research Institute of Hunan University, Shenzhen, 518063, China
- International Science and Technology Innovation Cooperation Base for Advanced Display Technologies of Hunan Province, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Chen Chen
- Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, 410000, China
| | - Huajie Chen
- Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, 411105, China
| | - Suhao Wang
- Unité de Dynamique et Structure des Matériaux Moléculaires (UDSMM), Université du Littoral Côte d'Opale, 145 Avenue Maurice Schumann, Dunkerque, 59140, France
| | - Wenwu Li
- Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception, Institute of Optoelectronics, Department of Materials Science, Fudan University, Shanghai, 200433, China
| | - Yuanyuan Hu
- Changsha Semiconductor Technology and Application Innovation Research Institute, College of Semiconductors (College of Integrated Circuits), Hunan University, Changsha, 410082, China
- Shenzhen Research Institute of Hunan University, Shenzhen, 518063, China
- International Science and Technology Innovation Cooperation Base for Advanced Display Technologies of Hunan Province, School of Physics and Electronics, Hunan University, Changsha, 410082, China
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6
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Le CV, Yoon H. Advances in the Use of Conducting Polymers for Healthcare Monitoring. Int J Mol Sci 2024; 25:1564. [PMID: 38338846 PMCID: PMC10855550 DOI: 10.3390/ijms25031564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 01/21/2024] [Accepted: 01/22/2024] [Indexed: 02/12/2024] Open
Abstract
Conducting polymers (CPs) are an innovative class of materials recognized for their high flexibility and biocompatibility, making them an ideal choice for health monitoring applications that require flexibility. They are active in their design. Advances in fabrication technology allow the incorporation of CPs at various levels, by combining diverse CPs monomers with metal particles, 2D materials, carbon nanomaterials, and copolymers through the process of polymerization and mixing. This method produces materials with unique physicochemical properties and is highly customizable. In particular, the development of CPs with expanded surface area and high conductivity has significantly improved the performance of the sensors, providing high sensitivity and flexibility and expanding the range of available options. However, due to the morphological diversity of new materials and thus the variety of characteristics that can be synthesized by combining CPs and other types of functionalities, choosing the right combination for a sensor application is difficult but becomes important. This review focuses on classifying the role of CP and highlights recent advances in sensor design, especially in the field of healthcare monitoring. It also synthesizes the sensing mechanisms and evaluates the performance of CPs on electrochemical surfaces and in the sensor design. Furthermore, the applications that can be revolutionized by CPs will be discussed in detail.
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Affiliation(s)
- Cuong Van Le
- School of Polymer Science and Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea;
- Department of Polymer Engineering, Graduate School, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea
| | - Hyeonseok Yoon
- School of Polymer Science and Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea;
- Department of Polymer Engineering, Graduate School, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea
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7
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Duhandžić M, Lu-Dìaz M, Samanta S, Venkataraman D, Akšamija Z. Carrier Screening Controls Transport in Conjugated Polymers at High Doping Concentrations. PHYSICAL REVIEW LETTERS 2023; 131:248101. [PMID: 38181141 DOI: 10.1103/physrevlett.131.248101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Accepted: 11/03/2023] [Indexed: 01/07/2024]
Abstract
Transport properties of doped conjugated polymers (CPs) have been widely analyzed with the Gaussian disorder model (GDM) in conjunction with hopping transport between localized states. These models reveal that even in highly doped CPs, a majority of carriers are still localized because dielectric permittivity of CPs is well below that of inorganic materials, making Coulomb interactions between carriers and dopant counterions much more pronounced. However, previous studies within the GDM did not consider the role of screening the dielectric interactions by carriers. Here we implement carrier screening in the Debye-Hückel formalism in our calculations of dopant-induced energetic disorder, which modifies the Gaussian density of states (DOS). Then we solve the Pauli master equation using Miller-Abrahams hopping rates with states from the resulting screened DOS to obtain conductivity and Seebeck coefficient across a broad range of carrier concentrations and compare them to measurements. Our results show that screening has significant impact on the shape of the DOS and consequently on carrier transport, particularly at high doping. We prove that the slope of Seebeck coefficient versus electric conductivity, which was previously thought to be universal, is impacted by screening and decreases for systems with small dopant-carrier separation, explaining our measurements. We also show that thermoelectric power factor is underestimated by a factor of ∼10 at higher doping concentrations if screening is neglected. We conclude that carrier screening plays a crucial role in curtailing dopant-induced energetic disorder, particularly at high carrier concentrations.
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Affiliation(s)
- Muhamed Duhandžić
- Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, USA
| | - Michael Lu-Dìaz
- Department of Chemistry, University of Massachusetts Amherst, Amherst, Massachusetts 01003, USA
| | - Subhayan Samanta
- Department of Chemistry, University of Massachusetts Amherst, Amherst, Massachusetts 01003, USA
| | - Dhandapani Venkataraman
- Department of Chemistry, University of Massachusetts Amherst, Amherst, Massachusetts 01003, USA
| | - Zlatan Akšamija
- Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, USA
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8
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Limelette P, Leclerc N, Brinkmann M. Heterogeneous Oriented Structure model of thermoelectric transport in conducting polymers. Sci Rep 2023; 13:21161. [PMID: 38036620 PMCID: PMC10689499 DOI: 10.1038/s41598-023-48353-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Accepted: 11/25/2023] [Indexed: 12/02/2023] Open
Abstract
Understanding transport phenomena in conducting polymers (CP) is a main issue in order to optimize their performance and despite intense investigations, the influence of their microstructure remains controversial. By analyzing the thermoelectric measurements performed on highly oriented and non-oriented CP films, we show that an Heterogeneous Oriented Structure (HOSt) model considering both ordered and disordered domains is able to account for the thermoelectric transport in CP. This model unveils the key role of the crystallinity, the anisotropy and the alignment degree of these domains. It points out the importance of the thermal conductivity in the interpretation of the thermopower [Formula: see text] and explains the frequently observed electrical conductivity [Formula: see text] cut-off in the [Formula: see text] curves due to the disordered domains. By varying the alignment degree depending on the orientation and the anisotropy according to the face-on or the edge-on polymers conformation, the HOSt model successfully describes the overall measured thermoelectric properties by demonstrating its applicability to a wide variety of both oriented and non-oriented CP.
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Affiliation(s)
- Patrice Limelette
- GREMAN UMR 7347, Université de Tours, CNRS, INSA CVL, Parc de Grandmont, 37200, Tours, France.
| | - Nicolas Leclerc
- Université de Strasbourg, CNRS, ICPEES UMR 7515, 67087, Strasbourg, France
| | - Martin Brinkmann
- Université de Strasbourg, CNRS, ICS UPR 22, 67000, Strasbourg, France
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9
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Gilhooly-Finn PA, Jacobs IE, Bardagot O, Zaffar Y, Lemaire A, Guchait S, Zhang L, Freeley M, Neal W, Richard F, Palma M, Banerji N, Sirringhaus H, Brinkmann M, Nielsen CB. Interplay between Side Chain Density and Polymer Alignment: Two Competing Strategies for Enhancing the Thermoelectric Performance of P3HT Analogues. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2023; 35:9029-9039. [PMID: 38027547 PMCID: PMC10653083 DOI: 10.1021/acs.chemmater.3c01680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 10/06/2023] [Indexed: 12/01/2023]
Abstract
A series of polythiophenes with varying side chain density was synthesized, and their electrical and thermoelectric properties were investigated. Aligned and non-aligned thin films of the polymers were characterized in the neutral and chemically doped states. Optical and diffraction measurements revealed an overall lower order in the thin films with lower side chain density, also confirmed using polarized optical experiments on aligned thin films. However, upon doping the non-aligned films, a sixfold increase in electrical conductivity was observed for the polythiophene with the lowest side chain density compared to poly(3-hexylthiophene) (P3HT). We found that the improvement in conductivity was not due to a larger charge carrier density but an increase in charge carrier mobility after doping with 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ). On the other hand, doped aligned films did not show the same trend; lower side chain density instead led to a lower conductivity and Seebeck coefficient compared to those for P3HT. This was attributed to the poorer alignment of the polymer thin films with lower side chain density. The study demonstrates that optimizing side chain density is a synthetically simple and effective way to improve electrical conductivity in polythiophene films relevant to thermoelectric applications.
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Affiliation(s)
- Peter A. Gilhooly-Finn
- Department
of Chemistry, University College London, Gower Street, London WC1E 6BT, U.K.
- Department
of Chemistry, Queen Mary University of London, Mile End Road, London E1 4NS, U.K.
| | - Ian E. Jacobs
- Optoelectronics
Group, University of Cambridge, Cavendish
Laboratory, J J Thomson Avenue, Cambridge CB3 0HE, U.K.
| | - Olivier Bardagot
- Department
of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Yasser Zaffar
- Department
of Chemistry, Queen Mary University of London, Mile End Road, London E1 4NS, U.K.
| | - Antoine Lemaire
- Charles
Sadron Institute (ICS), CNRS Université de Strasbourg, UPR
22, 23 Rue du Loess, Strasbourg Cedex 02, 67034, France
| | - Shubhradip Guchait
- Charles
Sadron Institute (ICS), CNRS Université de Strasbourg, UPR
22, 23 Rue du Loess, Strasbourg Cedex 02, 67034, France
| | - Lu Zhang
- Optoelectronics
Group, University of Cambridge, Cavendish
Laboratory, J J Thomson Avenue, Cambridge CB3 0HE, U.K.
| | - Mark Freeley
- Department
of Chemistry, Queen Mary University of London, Mile End Road, London E1 4NS, U.K.
| | - William Neal
- Department
of Chemistry, Queen Mary University of London, Mile End Road, London E1 4NS, U.K.
| | - Fanny Richard
- Université
de Strasbourg, CNRS, ISIS UMR 7006, Strasbourg 67000, France
| | - Matteo Palma
- Department
of Chemistry, Queen Mary University of London, Mile End Road, London E1 4NS, U.K.
| | - Natalie Banerji
- Department
of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Henning Sirringhaus
- Optoelectronics
Group, University of Cambridge, Cavendish
Laboratory, J J Thomson Avenue, Cambridge CB3 0HE, U.K.
| | - Martin Brinkmann
- Charles
Sadron Institute (ICS), CNRS Université de Strasbourg, UPR
22, 23 Rue du Loess, Strasbourg Cedex 02, 67034, France
| | - Christian B. Nielsen
- Department
of Chemistry, Queen Mary University of London, Mile End Road, London E1 4NS, U.K.
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10
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Lee J, Bark H, Xue Y, Lee PS, Zhong M. Size-Selective Ionic Crosslinking Provides Stretchable Mixed Ionic-Electronic Conductors. Angew Chem Int Ed Engl 2023; 62:e202306994. [PMID: 37597178 DOI: 10.1002/anie.202306994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 07/08/2023] [Accepted: 08/16/2023] [Indexed: 08/21/2023]
Abstract
Mechanically compliant conductors are of utmost importance for the emerging fields of soft electronics and robotics. However, the development of intrinsically deformable organic conductors remains a challenge due to the trade-off between mechanical performance and charge mobility. In this study, we report a solution to this issue based on size-selective ionic crosslinking. This rationally designed crosslinking mediated by length-regulated oligo(ethylene glycol) pendant groups and metal ions simultaneously improved the softness and toughness and ensured excellent mixed ionic-electronic conductivity in poly(3,4-ethylenedioxythiophene):polystyrene sulfonate composite materials. Moreover, the added ions remarkably promoted accumulation of charge carriers in response to temperature gradient, thus offering a viable approach to stretchable thermoelectric generators with enhanced stability against humidity.
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Affiliation(s)
- Junwoo Lee
- Department of Chemical and Environmental Engineering, Yale University, New Haven, CT 06520, USA
| | - Hyunwoo Bark
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Yazhen Xue
- Department of Chemical and Environmental Engineering, Yale University, New Haven, CT 06520, USA
| | - Pooi See Lee
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Mingjiang Zhong
- Department of Chemical and Environmental Engineering, Yale University, New Haven, CT 06520, USA
- Department of Chemistry, Yale University, New Haven, CT 06520, USA
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11
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Cavassin P, Holzer I, Tsokkou D, Bardagot O, Réhault J, Banerji N. Electrochemical Doping in Ordered and Disordered Domains of Organic Mixed Ionic-Electronic Conductors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2300308. [PMID: 37086157 DOI: 10.1002/adma.202300308] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 04/17/2023] [Indexed: 05/03/2023]
Abstract
Conjugated polymers are increasingly used as organic mixed ionic-electronic conductors in electrochemical applications for neuromorphic computing, bioelectronics, and energy harvesting. The design of efficient electrochemical devices relies on large modulations of the polymer conductivity, fast doping/dedoping kinetics, and high ionic uptake. In this work, structure-property relations are established and control of these parameters by the co-existence of order and disorder in the phase morphology is demonstrated. Using in situ time-resolved spectroelectrochemistry, resonant Raman, and terahertz (THz) conductivity measurements, the electrochemical doping in the different morphological domains of poly(3-hexylthiophene) (P3HT) is investigated. The main finding is that bipolarons are found preferentially in disordered polymer regions, where they are formed faster and are thermodynamically more favored. On the other hand, polarons show a preference for ordered domains, leading to drastically different bipolaron/polaron ratios and doping/dedoping dynamics in the distinct regions. A significant enhancement of the electronic conductivity is evident when bipolarons start forming in the disordered regions, while the presence of bipolarons in the ordered regions is detrimental for transport. This study provides significant advances in the understanding of the impact of morphology on the electrochemical doping of conjugated polymers and the induced increase in conductivity.
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Affiliation(s)
- Priscila Cavassin
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, Bern, 3012, Switzerland
| | - Isabelle Holzer
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, Bern, 3012, Switzerland
| | - Demetra Tsokkou
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, Bern, 3012, Switzerland
| | - Olivier Bardagot
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, Bern, 3012, Switzerland
| | - Julien Réhault
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, Bern, 3012, Switzerland
| | - Natalie Banerji
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, Bern, 3012, Switzerland
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12
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Control Aggregation of P3HT in Solution for High Efficiency Doping: Ensuring Structural Order and the Distribution of Dopants. CHINESE JOURNAL OF POLYMER SCIENCE 2023. [DOI: 10.1007/s10118-023-2939-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
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13
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Zhang Y, Deng L, Cho Y, Lee J, Shibayama N, Zhang Z, Wang C, Hu Z, Wang J, Wu F, Chen L, Du Y, Ren F, Yang C, Gao P. Revealing the Enhanced Thermoelectric Properties of Controllably Doped Donor-Acceptor Copolymer: The Impact of Regioregularity. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2206233. [PMID: 36592416 DOI: 10.1002/smll.202206233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 12/06/2022] [Indexed: 06/17/2023]
Abstract
Albeit considerable attention to the fast-developing organic thermoelectric (OTE) materials due to their flexibility and non-toxic features, it is still challenging to design an OTE polymer with superior thermoelectric properties. In this work, two "isomorphic" donor-acceptor (D-A) conjugated polymers are studied as the semiconductor in OTE devices, revealing for the first time the internal mechanism of regioregularity on thermoelectric performances in D-A type polymers. A higher molecular structure regularity can lead to higher crystalline order and mobility, higher doping efficiency, order of energy state, and thermoelectric (TE) performance. As a result, the regioregular P2F exhibits a maximum power factor (PF) of up to 113.27 µW m-1 K-2 , more than three times that of the regiorandom PRF (35.35 µW m-1 K-2 ). However, the regular backbone also implies lower miscibility with a dopant, negatively affecting TE performance. Therefore, the trade-off between doping efficiency and miscibility plays a vital role in OTE materials, and this work sheds light on the molecular design strategy of OTE polymers with state-of-the-art performances.
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Affiliation(s)
- Yingyao Zhang
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
- Laboratory of Advanced Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institute, Chinese Academy of Sciences, Xiamen, 361021, China
| | - Longhui Deng
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
- Laboratory of Advanced Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institute, Chinese Academy of Sciences, Xiamen, 361021, China
| | - Yongjoon Cho
- School of Energy and Chemical Engineering, Perovtronics Research Center, Low Dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulju-gun, 44919, Ulsan, South Korea
- Department of Chemistry and Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA
| | - Jungho Lee
- School of Energy and Chemical Engineering, Perovtronics Research Center, Low Dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulju-gun, 44919, Ulsan, South Korea
- Samsung Electro-Mechanics Co, Ltd., 150, Maeyeong-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16674, Republic of Korea
| | - Naoyuki Shibayama
- Naoyuki Shibayama, Department of Engineering, Toin University of Yokohama, 1614 Kurogane-cho, Aoba, Yokohama, Kanagawa, 225-8503, Japan
| | - Zilong Zhang
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
- Laboratory of Advanced Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institute, Chinese Academy of Sciences, Xiamen, 361021, China
| | - Can Wang
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
- Laboratory of Advanced Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institute, Chinese Academy of Sciences, Xiamen, 361021, China
| | - Zhenyu Hu
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
- Laboratory of Advanced Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institute, Chinese Academy of Sciences, Xiamen, 361021, China
| | - Jing Wang
- College of Chemistry, Nanchang University, 999 Xuefu Avenue, 330031, Nanchang, China
| | - Feiyan Wu
- College of Chemistry, Nanchang University, 999 Xuefu Avenue, 330031, Nanchang, China
| | - Lie Chen
- College of Chemistry, Nanchang University, 999 Xuefu Avenue, 330031, Nanchang, China
| | - Yitian Du
- Institute of Materials Physical Chemistry, Huaqiao University, Xiamen, 361021, China
| | - Fangbin Ren
- Xiamen University of Technology, Xiamen, 361024, China
| | - Changduk Yang
- School of Energy and Chemical Engineering, Perovtronics Research Center, Low Dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulju-gun, 44919, Ulsan, South Korea
- Graduate School of Carbon Neutrality, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulju-gun, 44919, Ulsan, South Korea
| | - Peng Gao
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
- Laboratory of Advanced Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institute, Chinese Academy of Sciences, Xiamen, 361021, China
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14
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Perry S, Arumugam S, Beeby S, Nandhakumar I. Template-free nanostructured poly-3-hexylthiophene (P3HT) films via single pulse-nucleated electrodeposition. J Electroanal Chem (Lausanne) 2023. [DOI: 10.1016/j.jelechem.2023.117278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
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15
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Guo J, Liu Y, Chen P, Wang X, Wang Y, Guo J, Qiu X, Zeng Z, Jiang L, Yi Y, Watanabe S, Liao L, Bai Y, Nguyen T, Hu Y. Revealing the Electrophilic-Attack Doping Mechanism for Efficient and Universal p-Doping of Organic Semiconductors. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2203111. [PMID: 36089649 PMCID: PMC9661849 DOI: 10.1002/advs.202203111] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 08/18/2022] [Indexed: 06/02/2023]
Abstract
Doping is of great importance to tailor the electrical properties of semiconductors. However, the present doping methodologies for organic semiconductors (OSCs) are either inefficient or can only apply to some OSCs conditionally, seriously limiting their general applications. Herein, a novel p-doping mechanism is revealed by investigating the interactions between the dopant trityl tetrakis(pentafluorophenyl) borate (TrTPFB) and poly(3-hexylthiophene) (P3HT). It is found that electrophilic attack of the trityl cations on thiophenes results in the formation of tritylated thiophenium ions, which subsequently induce electron transfer from neighboring P3HT chains to realize p-doping. This unique p-doping mechanism enables TrTPFB to p-dope various OSCs including those with high ionization energy (IE ≈ 5.8 eV). Moreover, this doping mechanism endows TrTPFB with strong doping capability, leading to doping efficiency of over 80% in P3HT. The discovery and elucidation of this novel doping mechanism not only points out that strong electrophiles are a class of efficient p-dopants for OSCs, but also provides new opportunities toward highly efficient doping of various OSCs.
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Affiliation(s)
- Jing Guo
- International Science and Technology Innovation Cooperation Base for Advanced Display Technologies of Hunan ProvinceCollege of Semiconductors (College of Integrated Circuits)Hunan UniversityChangsha410082P. R. China
| | - Ying Liu
- State Key Laboratory of Chem‐/Bio‐Sensing and ChemometricsSchool of Chemistry and Chemical EngineeringHunan UniversityChangshaHunan410082P. R. China
| | - Ping‐An Chen
- International Science and Technology Innovation Cooperation Base for Advanced Display Technologies of Hunan ProvinceCollege of Semiconductors (College of Integrated Circuits)Hunan UniversityChangsha410082P. R. China
| | - Xinhao Wang
- State Key Laboratory of Chem‐/Bio‐Sensing and ChemometricsSchool of Chemistry and Chemical EngineeringHunan UniversityChangshaHunan410082P. R. China
| | - Yanpei Wang
- State Key Laboratory of Chem‐/Bio‐Sensing and ChemometricsSchool of Chemistry and Chemical EngineeringHunan UniversityChangshaHunan410082P. R. China
| | - Jing Guo
- State Key Laboratory of Chem‐/Bio‐Sensing and ChemometricsSchool of Chemistry and Chemical EngineeringHunan UniversityChangshaHunan410082P. R. China
| | - Xincan Qiu
- International Science and Technology Innovation Cooperation Base for Advanced Display Technologies of Hunan ProvinceCollege of Semiconductors (College of Integrated Circuits)Hunan UniversityChangsha410082P. R. China
| | - Zebing Zeng
- State Key Laboratory of Chem‐/Bio‐Sensing and ChemometricsSchool of Chemistry and Chemical EngineeringHunan UniversityChangshaHunan410082P. R. China
| | - Lang Jiang
- Beijing National Laboratory for Molecular SciencesKey Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing100190P. R. China
| | - Yuanping Yi
- Beijing National Laboratory for Molecular SciencesKey Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing100190P. R. China
| | - Shun Watanabe
- Material Innovation Research Center (MIRC) and Department of Advanced Material ScienceGraduate School of Frontier SciencesThe University of Tokyo5‐1‐5 KashiwanohaKashiwaChiba77‐8561Japan
| | - Lei Liao
- International Science and Technology Innovation Cooperation Base for Advanced Display Technologies of Hunan ProvinceCollege of Semiconductors (College of Integrated Circuits)Hunan UniversityChangsha410082P. R. China
| | - Yugang Bai
- State Key Laboratory of Chem‐/Bio‐Sensing and ChemometricsSchool of Chemistry and Chemical EngineeringHunan UniversityChangshaHunan410082P. R. China
| | - Thuc‐Quyen Nguyen
- Center for Polymers and Organic SolidsDepartment of Chemistry and BiochemistryUniversity of California at Santa BarbaraSanta BarbaraCA93106USA
| | - Yuanyuan Hu
- International Science and Technology Innovation Cooperation Base for Advanced Display Technologies of Hunan ProvinceCollege of Semiconductors (College of Integrated Circuits)Hunan UniversityChangsha410082P. R. China
- Shenzhen Research Institute of Hunan UniversityShenzhen518063P. R. China
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16
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Mu X, Wang W, Sun C, Zhao D, Ma C, Zhu J, Knez M. Greatly increased electrical conductivity of PBTTT-C14 thin film via controllable single precursor vapor phase infiltration. NANOTECHNOLOGY 2022; 34:015709. [PMID: 36191569 DOI: 10.1088/1361-6528/ac96fa] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Accepted: 10/03/2022] [Indexed: 06/16/2023]
Abstract
Doping is an important strategy for effectively regulating the charge carrier concentration of semiconducting materials. In this study, the electronic properties of organic-inorganic hybrid semiconducting polymers, synthesized viain situcontrolled vapor phase infiltration (VPI) of poly[2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene] (PBTTT-C14) with the metal precursors molybdenum pentachloride (MoCl5) and titanium tetrachloride (TiCl4), were altered and characterized. The conductivities of the infiltration-doped PBTTT-C14 thin films were enhanced by up to 9 and 4 orders of magnitude, respectively. The significantly improved electrical properties may result from interactions between metal atoms in the metal precursors and sulfur of the thiophene rings, thus forming new chemical bonds. Importantly, VPI doping has little influence on the structure of the PBTTT-C14 thin films. Even if various dopant molecules infiltrate the polymer matrix, the interlayer spacing of the films will inevitably expand, but it has negligible effects on the overall morphology and structure of the film. Also, Lewis acid-doped PBTTT-C14 thin films exhibited excellent environmental stability. Therefore, the VPI-based doping process has great potential for use in processing high-quality conductive polymer films.
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Affiliation(s)
- Xueyang Mu
- School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Material, Shaanxi University of Science & Technology Xi'an, Shaanxi 710021, People's Republic of China
| | - Weike Wang
- School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Material, Shaanxi University of Science & Technology Xi'an, Shaanxi 710021, People's Republic of China
| | - Chongcai Sun
- School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Material, Shaanxi University of Science & Technology Xi'an, Shaanxi 710021, People's Republic of China
| | - Dan Zhao
- School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Material, Shaanxi University of Science & Technology Xi'an, Shaanxi 710021, People's Republic of China
| | - Chuang Ma
- School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Material, Shaanxi University of Science & Technology Xi'an, Shaanxi 710021, People's Republic of China
| | - Jiankang Zhu
- Guangzhou Special Pressure Equipment Inspection and Research Institute, National Graphene Product Quality Supervision and Inspection Center, Guangzhou, Guangdong 510700, People's Republic of China
| | - Mato Knez
- CIC nanoGUNE, Tolosa Hiribidea, 76, Donostia-San Sebastián, E-20018, Spain
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17
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Hicks GEJ, Cranston RR, Lotocki V, Manion JG, Lessard BH, Seferos DS. Dopant-Stabilized Assembly of Poly(3-hexylthiophene). J Am Chem Soc 2022; 144:16456-16470. [PMID: 36044779 DOI: 10.1021/jacs.2c04984] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Polymer self-assembly is a powerful approach for forming nanostructures for solution-phase applications. However, polymer semiconductor assembly has primarily been driven by solvent interactions. Here, we report poly(3-hexythiophene) homopolymer assembly driven and stabilized by oxidative doping with iron (III) p-toluenesulfonate in benzonitrile. By this improved method, dopant mol % and addition temperature determine the size and morphology of oxidized polymer nanostructures. The dopant counterion provides colloidal stability in a process of dopant-stabilized assembly (DSA). Each variable governing polymer assembly is systematically varied, revealing general principles of oxidized nanostructure assembly and allowing the polymer planarity, optical absorption, and doping level to be modulated. Oxidized nanostructure heights, lengths, and widths are shown to depend on these properties, which we hypothesize is due to competing nanostructure formation and oxidation mechanisms that are governed by the polymer conformation upon doping. Finally, we demonstrate that the nanoparticle oxidative doping level can be tuned post-formation through sequential dopant addition. By revealing the fundamental processes underlying DSA, this work provides a powerful toolkit to control the assembly and optoelectronic properties of oxidatively doped nanostructures in solution.
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Affiliation(s)
- Garion E J Hicks
- Lash Miller Chemical Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, M5S 3H6 Toronto, Ontario, Canada
| | - Rosemary R Cranston
- Department of Chemical and Biological Engineering, University of Ottawa, 161 Louis Pasteur, K1N 6N5 Ottawa, Ontario, Canada
| | - Victor Lotocki
- Lash Miller Chemical Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, M5S 3H6 Toronto, Ontario, Canada
| | - Joseph G Manion
- Department of Chemical and Biological Engineering, University of Ottawa, 161 Louis Pasteur, K1N 6N5 Ottawa, Ontario, Canada
| | - Benoît H Lessard
- Department of Chemical and Biological Engineering, University of Ottawa, 161 Louis Pasteur, K1N 6N5 Ottawa, Ontario, Canada.,School of Electrical Engineering and Computer Science, University of Ottawa, 800 King Edward, K1N 6N5 Ottawa, Ontario, Canada
| | - Dwight S Seferos
- Lash Miller Chemical Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, M5S 3H6 Toronto, Ontario, Canada.,Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College St, M5S 3E5 Toronto, Ontario, Canada
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18
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Wang S, Zuo G, Kim J, Sirringhaus H. Progress of Conjugated Polymers as Emerging Thermoelectric Materials. Prog Polym Sci 2022. [DOI: 10.1016/j.progpolymsci.2022.101548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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19
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Dixon AL, Vezin H, Nguyen TQ, Reddy GNM. Structural insights into Lewis acid- and F4TCNQ-doped conjugated polymers by solid-state magnetic resonance spectroscopy. MATERIALS HORIZONS 2022; 9:981-990. [PMID: 34982809 DOI: 10.1039/d1mh01574e] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Molecular doping strategies facilitate orders of magnitude enhancement in the charge carrier mobility of organic semiconductors (OSCs). Understanding the different doping mechanisms and molecular-level constraints on doping efficiency related to the material energy levels is crucial to develop versatile dopants for OSCs. Given the compositional and structural heterogeneities associated with OSC thin films, insight into dopant-polymer interactions by long-range techniques such as X-ray scattering and electron microscopy is exceedingly challenging to obtain. This study employs short-range probes, solid-state (ss)NMR and EPR spectroscopy, to resolve local structures and intermolecular interactions between dopants such as F4TCNQ (2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane), Lewis acid BCF (tris[pentafluorophenyl] borane) and Lewis base conjugated polymer, PCPDTBT (P4) (poly[2,6-(4,4-bis(2-hexadecyl)-4H-cyclopenta[2,1-b;3,4-b']dithiophene)-alt-4,7(2,1,3-benzothiadiazole)]). Analysis of 1H and 13C ssNMR spectra of P4, P4 : F4TCNQ and P4 : BCF blends indicates that the addition of dopants induces local structural changes in the P4 polymer, and causes paramagnetism-induced signal broadening and intensity losses. The hyperfine interactions in P4 : BCF and P4 : F4TCNQ are characterized by two-dimensional pulsed EPR spectroscopy. For P4 : F4TCNQ, 19F ssNMR analysis indicates that the F4TCNQ molecules are distributed and aggregated into different local chemical environments. By comparison, BCF molecules are intermixed with the P4 polymer and interact with traces of water molecules to form BCF-water complexes that serve as Brønsted acid sites, as revealed by 11B ssNMR spectroscopy. These results indicate that the P4-dopant blends exhibit complex morphology with different distributions of dopants, whereby the combined use of ssNMR and EPR provides essential insights into how higher doping efficiency is observed with BCF and a mediocre efficiency is associated with F4TCNQ molecules.
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Affiliation(s)
- Alana L Dixon
- Center for Polymers and Organic Solids, University of California Santa Barbara (UCSB), Santa Barbara, California 93106, USA.
| | - Hervé Vezin
- University of Lille, CNRS UMR8516, LASIRE, Lille, F-59000, France
| | - Thuc-Quyen Nguyen
- Center for Polymers and Organic Solids, University of California Santa Barbara (UCSB), Santa Barbara, California 93106, USA.
| | - G N Manjunatha Reddy
- University of Lille, CNRS, Centrale Lille Institut, Univ. Artois, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, Lille, F-59000, France.
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20
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Kurioka T, Komamura T, Shida N, Hayakawa T, Tomita I, Inagi S. Ordered‐Structure‐Induced Electrochemical Post‐Functionalization of Poly(3‐(2‐ethylhexyl)thiophene). MACROMOL CHEM PHYS 2022. [DOI: 10.1002/macp.202100435] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Tomoyuki Kurioka
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology Tokyo Institute of Technology 4259 Nagatsuta‐cho Midori‐ku Yokohama 226–8502 Japan
| | - Takahiro Komamura
- Department of Materials Science and Engineering, School of Materials and Chemical Technology Tokyo Institute of Technology 2‐12‐1 Ookayama Meguro‐ku Tokyo 152–8552 Japan
| | - Naoki Shida
- Graduate School of Science and Engineering Yokohama National University 79‐5 Tokiwadai Hodogaya‐ku Yokohama 240–8501 Japan
| | - Teruaki Hayakawa
- Department of Materials Science and Engineering, School of Materials and Chemical Technology Tokyo Institute of Technology 2‐12‐1 Ookayama Meguro‐ku Tokyo 152–8552 Japan
| | - Ikuyoshi Tomita
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology Tokyo Institute of Technology 4259 Nagatsuta‐cho Midori‐ku Yokohama 226–8502 Japan
| | - Shinsuke Inagi
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology Tokyo Institute of Technology 4259 Nagatsuta‐cho Midori‐ku Yokohama 226–8502 Japan
- PRESTO Japan Science and Technology Agency (JST) 4‐1‐8 Honcho Kawaguchi Saitama 332‐0012 Japan
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21
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Tsokkou D, Cavassin P, Rebetez G, Banerji N. Bipolarons rule the short-range terahertz conductivity in electrochemically doped P3HT. MATERIALS HORIZONS 2022; 9:482-491. [PMID: 34904620 PMCID: PMC8725991 DOI: 10.1039/d1mh01343b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 12/07/2021] [Indexed: 06/14/2023]
Abstract
Doping of organic semiconductor films enhances their conductivity for applications in organic electronics, thermoelectrics and bioelectronics. However, much remains to be learnt about the properties of the conductive charges in order to optimize the design of the materials. Electrochemical doping is not only the fundamental mechanism in organic electrochemical transistors (OECTs), used in biomedical sensors, but it also represents an ideal playground for fundamental studies. Benefits of investigating doping mechanisms via electrochemistry include controllable doping levels, reversibility and high achievable carrier densities. We introduced here a new technique, applying in situ terahertz (THz) spectroscopy directly to an electrochemically doped polymer in combination with spectro-electrochemistry and chronoamperometry. We evaluate the intrinsic short-range transport properties of the polymer (without the effects of long-range disorder, grain boundaries and contacts), while precisely tuning the doping level via the applied oxidation voltage. Analysis of the complex THz conductivity reveals both the mobility and density of the charges. We find that polarons and bipolarons need to co-exist in an optimal ratio to reach high THz conductivity (∼300 S cm-1) and mobility (∼7 cm2 V-1 s-1) of P3HT in aqueous KPF6 electrolyte. In this regime, charge mobility increases and a high fraction of injected charges (up to 25%) participates in the transport via mixed-valence hopping. We also show significantly higher conductivity in electrochemically doped P3HT with respect to co-processed molecularly doped films at a similar doping level, which suffer from low mobility. Efficient molecular doping should therefore aim for reduced disorder, high doping levels and backbones that favour bipolaron formation.
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Affiliation(s)
- Demetra Tsokkou
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP), University of Bern, Freiestrasse 3, 3012 Bern, Switzerland.
| | - Priscila Cavassin
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP), University of Bern, Freiestrasse 3, 3012 Bern, Switzerland.
| | - Gonzague Rebetez
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP), University of Bern, Freiestrasse 3, 3012 Bern, Switzerland.
| | - Natalie Banerji
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP), University of Bern, Freiestrasse 3, 3012 Bern, Switzerland.
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22
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Zokaei S, Kim D, Järsvall E, Fenton AM, Weisen AR, Hultmark S, Nguyen PH, Matheson AM, Lund A, Kroon R, Chabinyc ML, Gomez ED, Zozoulenko I, Müller C. Tuning of the elastic modulus of a soft polythiophene through molecular doping. MATERIALS HORIZONS 2022; 9:433-443. [PMID: 34787612 DOI: 10.1039/d1mh01079d] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Molecular doping of a polythiophene with oligoethylene glycol side chains is found to strongly modulate not only the electrical but also the mechanical properties of the polymer. An oxidation level of up to 18% results in an electrical conductivity of more than 52 S cm-1 and at the same time significantly enhances the elastic modulus from 8 to more than 200 MPa and toughness from 0.5 to 5.1 MJ m-3. These changes arise because molecular doping strongly influences the glass transition temperature Tg and the degree of π-stacking of the polymer, as indicated by both X-ray diffraction and molecular dynamics simulations. Surprisingly, a comparison of doped materials containing mono- or dianions reveals that - for a comparable oxidation level - the presence of multivalent counterions has little effect on the stiffness. Evidently, molecular doping is a powerful tool that can be used for the design of mechanically robust conducting materials, which may find use within the field of flexible and stretchable electronics.
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Affiliation(s)
- Sepideh Zokaei
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Göteborg 41296, Sweden.
| | - Donghyun Kim
- Laboratory of Organic Electronics, Linköping University, Norrköping 60174, Sweden
| | - Emmy Järsvall
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Göteborg 41296, Sweden.
| | - Abigail M Fenton
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Albree R Weisen
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Sandra Hultmark
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Göteborg 41296, Sweden.
| | - Phong H Nguyen
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, USA
| | - Amanda M Matheson
- Materials Department, University of California, Santa Barbara, California 93106, USA
| | - Anja Lund
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Göteborg 41296, Sweden.
| | - Renee Kroon
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Göteborg 41296, Sweden.
- Laboratory of Organic Electronics, Linköping University, Norrköping 60174, Sweden
- Wallenberg Wood Science Center, Linköping University, Norrköping 60174, Sweden
| | - Michael L Chabinyc
- Materials Department, University of California, Santa Barbara, California 93106, USA
| | - Enrique D Gomez
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Igor Zozoulenko
- Laboratory of Organic Electronics, Linköping University, Norrköping 60174, Sweden
- Wallenberg Wood Science Center, Linköping University, Norrköping 60174, Sweden
| | - Christian Müller
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Göteborg 41296, Sweden.
- Wallenberg Wood Science Center, Chalmers University of Technology, Göteborg 41296, Sweden
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23
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Scaccabarozzi AD, Basu A, Aniés F, Liu J, Zapata-Arteaga O, Warren R, Firdaus Y, Nugraha MI, Lin Y, Campoy-Quiles M, Koch N, Müller C, Tsetseris L, Heeney M, Anthopoulos TD. Doping Approaches for Organic Semiconductors. Chem Rev 2021; 122:4420-4492. [PMID: 34793134 DOI: 10.1021/acs.chemrev.1c00581] [Citation(s) in RCA: 77] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Electronic doping in organic materials has remained an elusive concept for several decades. It drew considerable attention in the early days in the quest for organic materials with high electrical conductivity, paving the way for the pioneering work on pristine organic semiconductors (OSCs) and their eventual use in a plethora of applications. Despite this early trend, however, recent strides in the field of organic electronics have been made hand in hand with the development and use of dopants to the point that are now ubiquitous. Here, we give an overview of all important advances in the area of doping of organic semiconductors and their applications. We first review the relevant literature with particular focus on the physical processes involved, discussing established mechanisms but also newly proposed theories. We then continue with a comprehensive summary of the most widely studied dopants to date, placing particular emphasis on the chemical strategies toward the synthesis of molecules with improved functionality. The processing routes toward doped organic films and the important doping-processing-nanostructure relationships, are also discussed. We conclude the review by highlighting how doping can enhance the operating characteristics of various organic devices.
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Affiliation(s)
- Alberto D Scaccabarozzi
- King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), Thuwal 23955, Saudi Arabia
| | - Aniruddha Basu
- King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), Thuwal 23955, Saudi Arabia
| | - Filip Aniés
- Department of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, U.K
| | - Jian Liu
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Göteborg 412 96, Sweden
| | - Osnat Zapata-Arteaga
- Materials Science Institute of Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Spain
| | - Ross Warren
- Institut für Physik & IRIS Adlershof, Humboldt-Universität zu Berlin, 12489 Berlin, Germany
| | - Yuliar Firdaus
- King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), Thuwal 23955, Saudi Arabia.,Research Center for Electronics and Telecommunication, Indonesian Institute of Science, Jalan Sangkuriang Komplek LIPI Building 20 level 4, Bandung 40135, Indonesia
| | - Mohamad Insan Nugraha
- King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), Thuwal 23955, Saudi Arabia
| | - Yuanbao Lin
- King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), Thuwal 23955, Saudi Arabia
| | - Mariano Campoy-Quiles
- Materials Science Institute of Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Spain
| | - Norbert Koch
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Kekulé-Strasse 5, 12489 Berlin, Germany.,Institut für Physik & IRIS Adlershof, Humboldt-Universität zu Berlin, 12489 Berlin, Germany
| | - Christian Müller
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Göteborg 412 96, Sweden
| | - Leonidas Tsetseris
- Department of Physics, National Technical University of Athens, Athens GR-15780, Greece
| | - Martin Heeney
- Department of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, U.K
| | - Thomas D Anthopoulos
- King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), Thuwal 23955, Saudi Arabia
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24
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Krauss G, Hochgesang A, Mohanraj J, Thelakkat M. Highly Efficient Doping of Conjugated Polymers Using Multielectron Acceptor Salts. Macromol Rapid Commun 2021; 42:e2100443. [PMID: 34599788 DOI: 10.1002/marc.202100443] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 09/23/2021] [Indexed: 11/06/2022]
Abstract
Chemical doping is a vital tool for tuning electronic properties of conjugated polymers. Most single electron acceptors used for p-doping necessitate high dopant concentrations to achieve good electrical conductivity. However, high-molar doping ratios hamper doping efficiency. Here a new concept of using multielectron acceptor (MEA) salts as dopants for conjugated polymers is presented. Two novel MEA salts are synthesized and their doping efficiency towards two polymers differing in their dielectric properties are compared with two single electron acceptors such as NOPF6 and magic blue. Cutting-edge methods such as ultraviolet photoelectron spectroscopy/X-ray photoelectron spectroscopy (XPS), impedance spectroscopy, and density of states analysis in addition to UV-vis-NIR absorption, spectroelectrochemistry, and Raman spectroscopy methods are used to characterize the doped systems. The tetracation salt improves the conductivity by two orders of magnitude and quadruples the charge carrier concentration compared to single electron acceptors for the same molar ratio. The differences in charge carrier density and activation energy on doping are delineated. Further, a strong dependency of the carrier release on the polymer polarity is observed. High carrier densities at reduced dopant loadings and improved doping efficacies using MEA dopants offer a highly efficient doping strategy for conjugated polymers.
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Affiliation(s)
- Gert Krauss
- Applied Functional Polymers, Macromolecular Chemistry I, University of Bayreuth, Bayreuth, 95440, Germany
| | - Adrian Hochgesang
- Applied Functional Polymers, Macromolecular Chemistry I, University of Bayreuth, Bayreuth, 95440, Germany
| | - John Mohanraj
- Applied Functional Polymers, Macromolecular Chemistry I, University of Bayreuth, Bayreuth, 95440, Germany
| | - Mukundan Thelakkat
- Applied Functional Polymers, Macromolecular Chemistry I, University of Bayreuth, Bayreuth, 95440, Germany.,Bavarian Polymer Institute, University of Bayreuth, Bayreuth, 95440, Germany
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25
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Ma T, Dong BX, Onorato JW, Niklas J, Poluektov O, Luscombe CK, Patel SN. Correlating conductivity and Seebeck coefficient to doping within crystalline and amorphous domains in poly(3‐(methoxyethoxyethoxy)thiophene). JOURNAL OF POLYMER SCIENCE 2021. [DOI: 10.1002/pol.20210608] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Tengzhou Ma
- Pritzker School of Molecular Engineering University of Chicago Chicago Illinois USA
| | - Ban Xuan Dong
- Pritzker School of Molecular Engineering University of Chicago Chicago Illinois USA
| | - Jonathan W. Onorato
- Department of Materials Science and Engineering University of Washington Seattle Washington USA
| | - Jens Niklas
- Chemical Sciences and Engineering Division Argonne National Laboratory Lemont Illinois USA
| | - Oleg Poluektov
- Chemical Sciences and Engineering Division Argonne National Laboratory Lemont Illinois USA
| | - Christine K. Luscombe
- Department of Materials Science and Engineering University of Washington Seattle Washington USA
- Department of Chemistry University of Washington Seattle Washington USA
- Molecular Engineering and Sciences Institute University of Washington Seattle Washington USA
| | - Shrayesh N. Patel
- Pritzker School of Molecular Engineering University of Chicago Chicago Illinois USA
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26
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Foyle LDP, Hicks GEJ, Pollit AA, Seferos DS. Polyacetylene Revisited: A Computational Study of the Molecular Engineering of N-type Polyacetylene. J Phys Chem Lett 2021; 12:7745-7751. [PMID: 34369780 DOI: 10.1021/acs.jpclett.1c01925] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The development of stable and highly conductive polymers, particularly n-type materials, remains an outstanding challenge in organic electronics. N-doped polyacetylene has long been studied as a highly conductive organic n-type material but suffers from extremely poor stability. Herein, we use DFT to model a series of n-doped polyacetylene derivatives, which have been functionalized with a range of electron-withdrawing substituents, with the goal of identifying attractive candidates for synthesis. We analyze the predicted molecular orbital energies, polymer planarity, and delocalization of charge carriers along the polymer backbone. In so doing, we develop key insights about the ideal substituents for both stable and highly conductive polyacetylene derivatives. This work will inform the modern synthesis and development of new polyacetylene derivatives. Beyond this, the work identifies a variety of new materials that have not yet been synthesized and should be good candidates for emerging optoelectronic applications including soft thermoelectrics, bioelectronics, and flexible device technologies.
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Affiliation(s)
- Liam D P Foyle
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| | - Garion E J Hicks
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| | - Adam A Pollit
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| | - Dwight S Seferos
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, Ontario M5S 3E5, Canada
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27
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Krumland J, Valencia AM, Cocchi C. Exploring organic semiconductors in solution: the effects of solvation, alkylization, and doping. Phys Chem Chem Phys 2021; 23:4841-4855. [PMID: 33605967 DOI: 10.1039/d0cp06085b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first-principles simulation of the electronic structure of organic semiconductors in solution poses a number of challenges that are not trivial to address simultaneously. In this work, we investigate the effects and the mutual interplay of solvation, alkylization, and doping on the structural, electronic, and optical properties of sexithiophene, a representative organic semiconductor molecule. To this end, we employ (time-dependent) density functional theory in conjunction with the polarizable-continuum model. We find that the torsion between adjacent monomer units plays a key role, as it strongly influences the electronic structure of the molecule, including energy gap, ionization potential, and band widths. Alkylization promotes delocalization of the molecular orbitals up to the first methyl unit, regardless of the chain length, leading to an overall shift of the energy levels. The alterations in the electronic structure are reflected in the optical absorption, which is additionally affected by dynamical solute-solvent interactions. Taking all these effects into account, solvents decrease the optical gap by an amount that depends on its polarity, and concomitantly increase the oscillator strength of the first excitation. The interaction with a dopant molecule promotes planarization. In such scenario, solvation and alkylization enhance charge transfer both in the ground state and in the excited state.
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Affiliation(s)
- Jannis Krumland
- Humboldt-Universität zu Berlin, Physics Department and IRIS Adlershof, 12489 Berlin, Germany.
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28
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Baker C, Wagner K, Wagner P, Officer DL, Mawad D. Biofunctional conducting polymers: synthetic advances, challenges, and perspectives towards their use in implantable bioelectronic devices. ADVANCES IN PHYSICS: X 2021. [DOI: 10.1080/23746149.2021.1899850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Affiliation(s)
- Carly Baker
- ARC Centre of Excellence for Electromaterials Science and Intelligent Polymer Research Institute, AIIM Faculty, Innovation Campus, University of Wollongong, North Wollongong, Australia
| | - Klaudia Wagner
- ARC Centre of Excellence for Electromaterials Science and Intelligent Polymer Research Institute, AIIM Faculty, Innovation Campus, University of Wollongong, North Wollongong, Australia
| | - Pawel Wagner
- ARC Centre of Excellence for Electromaterials Science and Intelligent Polymer Research Institute, AIIM Faculty, Innovation Campus, University of Wollongong, North Wollongong, Australia
| | - David L. Officer
- ARC Centre of Excellence for Electromaterials Science and Intelligent Polymer Research Institute, AIIM Faculty, Innovation Campus, University of Wollongong, North Wollongong, Australia
| | - Damia Mawad
- School of Materials Science and Engineering, UNSW Science, University of New South Wales, Sydney, Australia
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29
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Tait CE, Reckwitz A, Arvind M, Neher D, Bittl R, Behrends J. Spin-spin interactions and spin delocalisation in a doped organic semiconductor probed by EPR spectroscopy. Phys Chem Chem Phys 2021; 23:13827-13841. [PMID: 34151324 DOI: 10.1039/d1cp02133h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The enhancement and control of the electrical conductivity of organic semiconductors is fundamental for their use in optoelectronic applications and can be achieved by molecular doping, which introduces additional charge carriers through electron transfer between a dopant molecule and the organic semiconductor. Here, we use Electron Paramagnetic Resonance (EPR) spectroscopy to characterise the unpaired spins associated with the charges generated by molecular doping of the prototypical organic semiconductor poly(3-hexylthiophene) (P3HT) with 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) and tris(pentafluorophenyl)borane (BCF). The EPR results reveal the P3HT radical cation as the only paramagnetic species in BCF-doped P3HT films and show evidence for increased mobility of the detected spins at high doping concentrations as well as formation of antiferromagnetically coupled spin pairs leading to decreased spin concentrations at low temperatures. The EPR signature for F4TCNQ-doped P3HT is found to be determined by spin exchange between P3HT radical cations and F4TCNQ radical anions. Results from continuous-wave and pulse EPR measurements suggest the presence of the unpaired spin on P3HT in a multitude of environments, ranging from free P3HT radical cations with similar properties to those observed in BCF-doped P3HT, to pairs of dipolar and exchange-coupled spins on P3HT and the dopant anion. Characterisation of the proton hyperfine interactions by ENDOR allowed quantification of the extent of spin delocalisation and revealed reduced delocalisation in the F4TCNQ-doped P3HT films.
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Affiliation(s)
- Claudia E Tait
- Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany. and Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, OX1 3QZ Oxford, UK
| | - Anna Reckwitz
- Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.
| | - Malavika Arvind
- Institute of Physics and Astronomy, Universität Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany
| | - Dieter Neher
- Institute of Physics and Astronomy, Universität Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany
| | - Robert Bittl
- Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.
| | - Jan Behrends
- Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.
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30
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Lund A, Wu Y, Fenech-Salerno B, Torrisi F, Carmichael TB, Müller C. Conducting materials as building blocks for electronic textiles. MRS BULLETIN 2021; 46:491-501. [PMID: 34720389 PMCID: PMC8550728 DOI: 10.1557/s43577-021-00117-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 05/03/2021] [Indexed: 05/07/2023]
Abstract
ABSTRACT To realize the full gamut of functions that are envisaged for electronic textiles (e-textiles) a range of semiconducting, conducting and electrochemically active materials are needed. This article will discuss how metals, conducting polymers, carbon nanotubes, and two-dimensional (2D) materials, including graphene and MXenes, can be used in concert to create e-textile materials, from fibers and yarns to patterned fabrics. Many of the most promising architectures utilize several classes of materials (e.g., elastic fibers composed of a conducting material and a stretchable polymer, or textile devices constructed with conducting polymers or 2D materials and metal electrodes). While an increasing number of materials and devices display a promising degree of wash and wear resistance, sustainability aspects of e-textiles will require greater attention.
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Affiliation(s)
- Anja Lund
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Gothenburg, Sweden
| | - Yunyun Wu
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Canada
| | - Benji Fenech-Salerno
- Molecular Sciences Research Hub, Imperial College London, White City Campus, London, UK
| | - Felice Torrisi
- Molecular Sciences Research Hub, Imperial College London, White City Campus, London, UK
| | | | - Christian Müller
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Gothenburg, Sweden
- Wallenberg Wood Science Center, Chalmers University of Technology, Gothenburg, Sweden
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31
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Sahalianov I, Hynynen J, Barlow S, Marder SR, Müller C, Zozoulenko I. UV-to-IR Absorption of Molecularly p-Doped Polythiophenes with Alkyl and Oligoether Side Chains: Experiment and Interpretation Based on Density Functional Theory. J Phys Chem B 2020; 124:11280-11293. [PMID: 33237790 PMCID: PMC7872427 DOI: 10.1021/acs.jpcb.0c08757] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 11/04/2020] [Indexed: 11/28/2022]
Abstract
The UV-to-IR transitions in p-doped poly(3-hexylthiophene) (P3HT) with alkyl side chains and polar polythiophene with tetraethylene glycol side chains are studied experimentally by means of the absorption spectroscopy and computationally using density functional theory (DFT) and tight-binding DFT. The evolution of electronic structure is calculated as the doping level is varied, while the roles of dopant ions, chain twisting, and π-π stacking are also considered, each of these having the effect of broadening the absorption peaks while not significantly changing their positions. The calculated spectra are found to be in good agreement with experimental spectra obtained for the polymers doped with a molybdenum dithiolene complex. As in other DFT studies of doped conjugated polymers, the electronic structure and assignment of optical transitions that emerge are qualitatively different from those obtained through earlier "traditional" approaches. In particular, the two prominent bands seen for the p-doped materials are present for both polarons and bipolarons/polaron pairs. The lowest energy of these transitions is due to excitation from the valence band to a spin-resolved orbitals located in the gap between the bands. The higher-energy band is a superposition of excitation from the valence band to a spin-resolved orbitals in the gap and an excitation between bands.
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Affiliation(s)
- Ihor Sahalianov
- Laboratory
of Organic Electronics, Department of Science and Technology, Linköping University, 60174 Norrköping, Sweden
| | - Jonna Hynynen
- Department
of Chemistry and Chemical Engineering, Chalmers
University of Technology, 41296 Göteborg, Sweden
| | - Stephen Barlow
- School
of Chemistry and Biochemistry and Center for Organic Photonics and
Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
| | - Seth R. Marder
- School
of Chemistry and Biochemistry and Center for Organic Photonics and
Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
| | - Christian Müller
- Department
of Chemistry and Chemical Engineering, Chalmers
University of Technology, 41296 Göteborg, Sweden
| | - Igor Zozoulenko
- Laboratory
of Organic Electronics, Department of Science and Technology, Linköping University, 60174 Norrköping, Sweden
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32
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Nagamatsu S, Pandey SS. Ordered arrangement of F4TCNQ anions in three-dimensionally oriented P3HT thin films. Sci Rep 2020; 10:20020. [PMID: 33208776 PMCID: PMC7674482 DOI: 10.1038/s41598-020-77022-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 11/04/2020] [Indexed: 11/25/2022] Open
Abstract
An ordered arrangement of electron-accepting molecular dopant, 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ), in three-dimensionally (3D) oriented poly(3-hexylthiophene) (P3HT) film was clarified. The 3D oriented P3HT thin films prepared by the friction-transfer technique were doped with F4TCNQ by dipping into an acetonitrile solution. The presence of F4TCNQ anions in the 3D oriented P3HT thin films was investigated by polarized ultraviolet/visible/near-infrared absorption spectroscopy, grazing incidence X-ray diffractometry, polarized Fourier transform infrared spectroscopy (FT-IR), and infrared p-polarized multiple-angle incidence resolution spectroscopy (pMAIRS). The F4TCNQ-doped 3D oriented P3HT films showed anisotropic properties in all characterizations. In particular, the anisotropic molecular vibrations from polarized FT-IR and pMAIRS have clearly revealed orientations of polymeric chains and molecular dopant molecules. Considering the results from several independent techniques indicated that F4TCNQ anions in the 3D oriented P3HT were orderly arranged in a 3D manner with respect to the 3D oriented P3HT such that their molecular long-axis parallel to the P3HT backbone, with in-plane molecular orientation. Additionally, the direction of the optical transition moment of the F4TCNQ anion was found to be parallel to the molecular short-axis.
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Affiliation(s)
- Shuichi Nagamatsu
- Department of Physics and Information Technology, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka, Fukuoka, 820-8502, Japan.
| | - Shyam S Pandey
- Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, 808-0196, Japan
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33
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Untilova V, Hynynen J, Hofmann AI, Scheunemann D, Zhang Y, Barlow S, Kemerink M, Marder SR, Biniek L, Müller C, Brinkmann M. High Thermoelectric Power Factor of Poly(3-hexylthiophene) through In-Plane Alignment and Doping with a Molybdenum Dithiolene Complex. Macromolecules 2020; 53:6314-6321. [PMID: 32913375 PMCID: PMC7472519 DOI: 10.1021/acs.macromol.0c01223] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 06/22/2020] [Indexed: 12/27/2022]
Abstract
We report a record thermoelectric power factor of up to 160 μW m-1 K-2 for the conjugated polymer poly(3-hexylthiophene) (P3HT). This result is achieved through the combination of high-temperature rubbing of thin films together with the use of a large molybdenum dithiolene p-dopant with a high electron affinity. Comparison of the UV-vis-NIR spectra of the chemically doped samples to electrochemically oxidized material reveals an oxidation level of 10%, i.e., one polaron for every 10 repeat units. The high power factor arises due to an increase in the charge-carrier mobility and hence electrical conductivity along the rubbing direction. We conclude that P3HT, with its facile synthesis and outstanding processability, should not be ruled out as a potential thermoelectric material.
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Affiliation(s)
| | - Jonna Hynynen
- Department
of Chemistry and Chemical Engineering, Chalmers
University of Technology, 41296 Göteborg, Sweden
| | - Anna I. Hofmann
- Department
of Chemistry and Chemical Engineering, Chalmers
University of Technology, 41296 Göteborg, Sweden
| | - Dorothea Scheunemann
- Department
of Chemistry and Chemical Engineering, Chalmers
University of Technology, 41296 Göteborg, Sweden
| | - Yadong Zhang
- School
of Chemistry & Biochemistry and Center for Organic Photonics and
Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
| | - Stephen Barlow
- School
of Chemistry & Biochemistry and Center for Organic Photonics and
Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
| | - Martijn Kemerink
- Centre
for Advanced Materials, Heidelberg University, 69120 Heidelberg, Germany
| | - Seth R. Marder
- School
of Chemistry & Biochemistry and Center for Organic Photonics and
Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
| | - Laure Biniek
- CNRS,
ICS UPR 22, Université de Strasbourg, F-67000 Strasbourg, France
| | - Christian Müller
- Department
of Chemistry and Chemical Engineering, Chalmers
University of Technology, 41296 Göteborg, Sweden
| | - Martin Brinkmann
- CNRS,
ICS UPR 22, Université de Strasbourg, F-67000 Strasbourg, France
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34
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Aubry TJ, Winchell KJ, Salamat CZ, Basile VM, Lindemuth JR, Stauber JM, Axtell JC, Kubena RM, Phan MD, Bird MJ, Spokoyny AM, Tolbert SH, Schwartz BJ. Tunable Dopants with Intrinsic Counterion Separation Reveal the Effects of Electron Affinity on Dopant Intercalation and Free Carrier Production in Sequentially Doped Conjugated Polymer Films. ADVANCED FUNCTIONAL MATERIALS 2020; 30:2001800. [PMID: 32684909 PMCID: PMC7357248 DOI: 10.1002/adfm.202001800] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 04/02/2020] [Accepted: 04/06/2020] [Indexed: 06/11/2023]
Abstract
Carrier mobility in doped conjugated polymers is limited by Coulomb interactions with dopant counterions. This complicates studying the effect of the dopant's oxidation potential on carrier generation because different dopants have different Coulomb interactions with polarons on the polymer backbone. Here, dodecaborane (DDB)-based dopants are used, which electrostatically shield counterions from carriers and have tunable redox potentials at constant size and shape. DDB dopants produce mobile carriers due to spatial separation of the counterion, and those with greater energetic offsets produce more carriers. Neutron reflectometry indicates that dopant infiltration into conjugated polymer films is redox-potential-driven. Remarkably, X-ray scattering shows that despite their large 2-nm size, DDBs intercalate into the crystalline polymer lamellae like small molecules, indicating that this is the preferred location for dopants of any size. These findings elucidate why doping conjugated polymers usually produces integer, rather than partial charge transfer: dopant counterions effectively intercalate into the lamellae, far from the polarons on the polymer backbone. Finally, it is shown that the IR spectrum provides a simple way to determine polaron mobility. Overall, higher oxidation potentials lead to higher doping efficiencies, with values reaching 100% for driving forces sufficient to dope poorly crystalline regions of the film.
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Affiliation(s)
- Taylor J. Aubry
- Department of Chemistry and BiochemistryUniversity of California, Los AngelesLos AngelesCA90095‐1569USA
| | - K. J. Winchell
- Department of Chemistry and BiochemistryUniversity of California, Los AngelesLos AngelesCA90095‐1569USA
| | - Charlene Z. Salamat
- Department of Chemistry and BiochemistryUniversity of California, Los AngelesLos AngelesCA90095‐1569USA
| | - Victoria M. Basile
- Department of Chemistry and BiochemistryUniversity of California, Los AngelesLos AngelesCA90095‐1569USA
| | | | - Julia M. Stauber
- Department of Chemistry and BiochemistryUniversity of California, Los AngelesLos AngelesCA90095‐1569USA
| | - Jonathan C. Axtell
- Department of Chemistry and BiochemistryUniversity of California, Los AngelesLos AngelesCA90095‐1569USA
| | - Rebecca M. Kubena
- Department of Chemistry and BiochemistryUniversity of California, Los AngelesLos AngelesCA90095‐1569USA
| | - Minh D. Phan
- Neutron Scattering DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Matthew J. Bird
- Chemistry DepartmentBrookhaven National LaboratoryUptonNY11973USA
| | - Alexander M. Spokoyny
- Department of Chemistry and BiochemistryUniversity of California, Los AngelesLos AngelesCA90095‐1569USA
- California NanoSystems InstituteUniversity of California, Los AngelesLos AngelesCA90095‐7227USA
| | - Sarah H. Tolbert
- Department of Chemistry and BiochemistryUniversity of California, Los AngelesLos AngelesCA90095‐1569USA
- California NanoSystems InstituteUniversity of California, Los AngelesLos AngelesCA90095‐7227USA
- Department of Materials Science and EngineeringUniversity of California, Los AngelesLos AngelesCA90095‐1595USA
| | - Benjamin J. Schwartz
- Department of Chemistry and BiochemistryUniversity of California, Los AngelesLos AngelesCA90095‐1569USA
- California NanoSystems InstituteUniversity of California, Los AngelesLos AngelesCA90095‐7227USA
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35
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Xu K, Sun H, Ruoko TP, Wang G, Kroon R, Kolhe NB, Puttisong Y, Liu X, Fazzi D, Shibata K, Yang CY, Sun N, Persson G, Yankovich AB, Olsson E, Yoshida H, Chen WM, Fahlman M, Kemerink M, Jenekhe SA, Müller C, Berggren M, Fabiano S. Ground-state electron transfer in all-polymer donor-acceptor heterojunctions. NATURE MATERIALS 2020; 19:738-744. [PMID: 32152564 DOI: 10.1038/s41563-020-0618-7] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 01/17/2020] [Indexed: 06/10/2023]
Abstract
Doping of organic semiconductors is crucial for the operation of organic (opto)electronic and electrochemical devices. Typically, this is achieved by adding heterogeneous dopant molecules to the polymer bulk, often resulting in poor stability and performance due to dopant sublimation or aggregation. In small-molecule donor-acceptor systems, charge transfer can yield high and stable electrical conductivities, an approach not yet explored in all-conjugated polymer systems. Here, we report ground-state electron transfer in all-polymer donor-acceptor heterojunctions. Combining low-ionization-energy polymers with high-electron-affinity counterparts yields conducting interfaces with resistivity values five to six orders of magnitude lower than the separate single-layer polymers. The large decrease in resistivity originates from two parallel quasi-two-dimensional electron and hole distributions reaching a concentration of ∼1013 cm-2. Furthermore, we transfer the concept to three-dimensional bulk heterojunctions, displaying exceptional thermal stability due to the absence of molecular dopants. Our findings hold promise for electro-active composites of potential use in, for example, thermoelectrics and wearable electronics.
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Affiliation(s)
- Kai Xu
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Norrköping, Sweden
| | - Hengda Sun
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Norrköping, Sweden.
| | - Tero-Petri Ruoko
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Norrköping, Sweden
| | - Gang Wang
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Norrköping, Sweden
| | - Renee Kroon
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Göteborg, Sweden
| | - Nagesh B Kolhe
- Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, WA, USA
| | - Yuttapoom Puttisong
- Department of Physics, Chemistry and Biology, Linköping University, Linköping, Sweden
| | - Xianjie Liu
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Norrköping, Sweden
| | - Daniele Fazzi
- Institute of Physical Chemistry, Department Chemistry, University of Cologne, Cologne, Germany
| | - Koki Shibata
- Graduate School of Science and Engineering, Chiba University, Inage-ku, Chiba, Japan
| | - Chi-Yuan Yang
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Norrköping, Sweden
| | - Ning Sun
- Department of Physics, Center for Optoelectronics Engineering Research, Yunnan University, Kunming, China
| | - Gustav Persson
- Department of Physics, Chalmers University of Technology, Göteborg, Sweden
| | - Andrew B Yankovich
- Department of Physics, Chalmers University of Technology, Göteborg, Sweden
| | - Eva Olsson
- Department of Physics, Chalmers University of Technology, Göteborg, Sweden
- Wallenberg Wood Science Center, Chalmers University of Technology, Göteborg, Sweden
| | - Hiroyuki Yoshida
- Graduate School of Engineering, Chiba University, Inage-ku, Chiba, Japan
- Molecular Chirality Research Center, Chiba University, Inage-ku, Chiba, Japan
| | - Weimin M Chen
- Department of Physics, Chemistry and Biology, Linköping University, Linköping, Sweden
| | - Mats Fahlman
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Norrköping, Sweden
- Wallenberg Wood Science Center, Linköping University, Norrköping, Sweden
| | - Martijn Kemerink
- Complex Materials and Devices, Department of Physics Chemistry and Biology, Linköping University, Linköping, Sweden
| | - Samson A Jenekhe
- Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, WA, USA
| | - Christian Müller
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Göteborg, Sweden
- Wallenberg Wood Science Center, Chalmers University of Technology, Göteborg, Sweden
| | - Magnus Berggren
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Norrköping, Sweden.
- Wallenberg Wood Science Center, Linköping University, Norrköping, Sweden.
| | - Simone Fabiano
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Norrköping, Sweden.
- Wallenberg Wood Science Center, Linköping University, Norrköping, Sweden.
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36
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Boosting the Power Factor of Benzodithiophene Based Donor-Acceptor Copolymers/SWCNTs Composites through Doping. Polymers (Basel) 2020; 12:polym12071447. [PMID: 32605206 PMCID: PMC7407128 DOI: 10.3390/polym12071447] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 06/22/2020] [Accepted: 06/24/2020] [Indexed: 11/17/2022] Open
Abstract
In this study, a benzodithiophene (BDT)-based donor (D)–acceptor (A) polymer containing carbazole segment in the side-chain was designed and synthesized and the thermoelectric composites with 50 wt % of single walled carbon nanotubes (SWCNTs) were prepared via ultrasonication method. Strong interfacial interactions existed in both of the composites before and after immersing into the 2,3,5,6-Tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) solution as confirmed by UV-Vis-NIR, Raman, XRD and SEM characterizations. After doping the composites by F4TCNQ, the electrical conductivity of the composites increased from 120.32 S cm−1 to 1044.92 S cm−1 in the room temperature. With increasing the temperature, the electrical conductivities and Seebeck coefficients of the undoped composites both decreased significantly for the composites; the power factor at 475 K was only 6.8 μW m−1 K−2, which was about nine times smaller than the power factor at room temperature (55.9 μW m−1 K−2). In the case of doped composites, although the electrical conductivity was deceased from 1044.9 S cm−1 to 504.17 S cm−1, the Seebeck coefficient increased from 23.76 μV K−1 to 35.69 μW m−1 K−2, therefore, the power factors of the doped composites were almost no change with heating the composite films.
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37
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Ma T, Dong BX, Grocke GL, Strzalka J, Patel SN. Leveraging Sequential Doping of Semiconducting Polymers to Enable Functionally Graded Materials for Organic Thermoelectrics. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c00402] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Tengzhou Ma
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
| | - Ban Xuan Dong
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
| | - Garrett L. Grocke
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
| | | | - Shrayesh N. Patel
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
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38
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Untilova V, Biskup T, Biniek L, Vijayakumar V, Brinkmann M. Control of Chain Alignment and Crystallization Helps Enhance Charge Conductivities and Thermoelectric Power Factors in Sequentially Doped P3HT:F4TCNQ Films. Macromolecules 2020. [DOI: 10.1021/acs.macromol.9b02389] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
| | - Till Biskup
- Physikalische Chemie und Didaktik der Chemie, Universität des Saarlandes, Campus B2 2, 66123 Saarbrücken, Germany
| | - Laure Biniek
- Université de Strasbourg, CNRS, ICS UPR 22, F-67000 Strasbourg, France
| | | | - Martin Brinkmann
- Université de Strasbourg, CNRS, ICS UPR 22, F-67000 Strasbourg, France
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39
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Zapata-Arteaga O, Dörling B, Perevedentsev A, Martín J, Reparaz JS, Campoy-Quiles M. Closing the Stability-Performance Gap in Organic Thermoelectrics by Adjusting the Partial to Integer Charge Transfer Ratio. Macromolecules 2020; 53:609-620. [PMID: 32089566 PMCID: PMC7032849 DOI: 10.1021/acs.macromol.9b02263] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 12/17/2019] [Indexed: 12/25/2022]
Abstract
Two doping mechanisms are known for the well-studied materials poly(3-hexylthiophene) (P3HT) and poly(2,5-bis(3-alkylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT), namely, integer charge transfer (ICT) and charge transfer complex (CTC) formation. Yet, there is poor understanding of the effect of doping mechanism on thermal stability and the thermoelectric properties. In this work, we present a method to finely adjust the ICT to CTC ratio. Using it, we characterize electrical and thermal conductivities as well as the Seebeck coefficient and the long-term stability under thermal stress of P3HT and PBTTT of different ICT/CTC ratios. We establish that doping through the CTC results in more stable, yet lower conductivity samples compared to ICT doped films. Importantly, moderate CTC fractions of ∼33% are found to improve the long-term stability without a significant sacrifice in electrical conductivity. Through visible and IR spectroscopies, polarized optical microscopy, and grazing-incidence wide-angle X-ray scattering, we find that the CTC dopant molecule access sites within the polymer network are less prone to dedoping upon thermal exposure.
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Affiliation(s)
- Osnat Zapata-Arteaga
- Institute
of Materials Science of Barcelona (ICMAB-CSIC), Campus of the UAB, 08193 Bellaterra, Spain
| | - Bernhard Dörling
- Institute
of Materials Science of Barcelona (ICMAB-CSIC), Campus of the UAB, 08193 Bellaterra, Spain
| | - Aleksandr Perevedentsev
- Institute
of Materials Science of Barcelona (ICMAB-CSIC), Campus of the UAB, 08193 Bellaterra, Spain
| | - Jaime Martín
- POLYMAT
and Polymer Science and Technology Department, Faculty of Chemistry, University of the Basque Country UPV/EHU, Manuel de Lardizabal 3, 20018 Donostia-San Sebastián, Spain
- Ikerbasque,
Basque Foundation for Science, E-48011 Bilbao, Spain
| | - J. Sebastian Reparaz
- Institute
of Materials Science of Barcelona (ICMAB-CSIC), Campus of the UAB, 08193 Bellaterra, Spain
| | - Mariano Campoy-Quiles
- Institute
of Materials Science of Barcelona (ICMAB-CSIC), Campus of the UAB, 08193 Bellaterra, Spain
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40
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Li H, DeCoster ME, Ming C, Wang M, Chen Y, Hopkins PE, Chen L, Katz HE. Enhanced Molecular Doping for High Conductivity in Polymers with Volume Freed for Dopants. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b02048] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Hui Li
- State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
- Department of Materials Science and Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States
| | - Mallory E. DeCoster
- Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904, United States
| | - Chen Ming
- State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
| | - Mengdi Wang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
| | - Yanling Chen
- State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
| | - Patrick E. Hopkins
- Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904, United States
| | - Lidong Chen
- State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Howard E. Katz
- Department of Materials Science and Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States
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41
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Yee PY, Scholes DT, Schwartz BJ, Tolbert SH. Dopant-Induced Ordering of Amorphous Regions in Regiorandom P3HT. J Phys Chem Lett 2019; 10:4929-4934. [PMID: 31382748 DOI: 10.1021/acs.jpclett.9b02070] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Despite the fact that molecular doping of semiconducting polymers has emerged as a valuable strategy for improving the performance of organic electronic devices, the fundamental dopant-polymer interactions are not fully understood. Here we use 2-D grazing incidence wide-angle X-ray scattering (GIWAXS) to demonstrate that adding oxidizing small-molecule dopants, such as 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) and FeCl3, into the amorphous conjugated polymer, regiorandom poly(3-hexylthiophene-2,5-diyl) (RRa-P3HT), improves polymer ordering and induces a change in domain orientation from isotropic to mostly edge-on. Doping thus causes RRa-P3HT to behave similarly to the more ordered regioregular P3HT. By comparing the optical, electrical, and structural properties of RRa-P3HT films doped with F4TNCQ and FeCl3 and those infiltrated with 7,7,8,8-tetracyanoquinodimethane (TCNQ), which occupies a similar volume as F4TCNQ but does not dope RRa-P3HT, we show that the increased ordering results not from the ability of the dopant to fill space but instead from the need to delocalize charge on the polymer in more than one dimension.
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Affiliation(s)
- Patrick Y Yee
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095-1569, United States
| | - D Tyler Scholes
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095-1569, United States
| | - Benjamin J Schwartz
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095-1569, United States
| | - Sarah H Tolbert
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095-1569, United States
- Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, California 90095-1595, United States
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42
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Dong BX, Liu Z, Misra M, Strzalka J, Niklas J, Poluektov OG, Escobedo FA, Ober CK, Nealey PF, Patel SN. Structure Control of a π-Conjugated Oligothiophene-Based Liquid Crystal for Enhanced Mixed Ion/Electron Transport Characteristics. ACS NANO 2019; 13:7665-7675. [PMID: 31194507 DOI: 10.1021/acsnano.9b01055] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Developing soft materials with both ion and electron transport functionalities is of broad interest for energy-storage and bioelectronics applications. Rational design of these materials requires a fundamental understanding of interactions between ion and electron conducting blocks along with the correlation between the microstructure and the conduction characteristics. Here, we investigate the structure and mixed ionic/electronic conduction in thin films of a liquid crystal (LC) 4T/PEO4, which consists of an electronically conducting quarterthiophene (4T) block terminated at both ends by ionically conducting oligoethylenoxide (PEO4) blocks. Using a combined experimental and simulation approach, 4T/PEO4 is shown to self-assemble into smectic, ordered, or disordered phases upon blending the materials with the ionic dopant bis(trifluoromethane)sulfonimide lithium (LiTFSI) under different LiTFSI concentrations. Interestingly, at intermediate LiTFSI concentration, ordered 4T/PEO4 exhibits an electronic conductivity as high as 3.1 × 10-3 S/cm upon being infiltrated with vapor of the 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) molecular dopant while still maintaining its ionic conducting functionality. This electronic conductivity is superior by an order of magnitude to the previously reported electronic conductivity of vapor co-deposited 4T/F4TCNQ blends. Our findings demonstrate that structure and electronic transport in mixed conduction materials could be modulated by the presence of the ion transporting component and will have important implications for other more complex mixed ionic/electronic conductors.
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Affiliation(s)
- Ban Xuan Dong
- Pritzker School of Molecular Engineering , University of Chicago , Chicago , Illinois 60637 , United States
| | | | | | | | | | | | | | | | - Paul F Nealey
- Pritzker School of Molecular Engineering , University of Chicago , Chicago , Illinois 60637 , United States
| | - Shrayesh N Patel
- Pritzker School of Molecular Engineering , University of Chicago , Chicago , Illinois 60637 , United States
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43
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Sun SJ, Menšík M, Toman P, Král K. Transverse electric field dependence of charge mobility in end-on oriented polymer structures. Chem Phys 2019. [DOI: 10.1016/j.chemphys.2019.02.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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44
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Wang S, Fazzi D, Puttisong Y, Jafari MJ, Chen Z, Ederth T, Andreasen JW, Chen WM, Facchetti A, Fabiano S. Effect of Backbone Regiochemistry on Conductivity, Charge Density, and Polaron Structure of n-Doped Donor-Acceptor Polymers. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2019; 31:3395-3406. [PMID: 31296974 PMCID: PMC6613787 DOI: 10.1021/acs.chemmater.9b00558] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Revised: 04/09/2019] [Indexed: 05/04/2023]
Abstract
We investigated the influence of backbone regiochemistry on the conductivity, charge density, and polaron structure in the widely studied n-doped donor-acceptor polymer poly[N,N'-bis(2-octyldodecyl)-1,4,5,8-naphthalenediimide-2,6-diyl]-alt-5,5'-(2,2'-bithiophene) [P(NDI2OD-T2)]. In contrast to classic semicrystalline polymers such as poly(3-hexylthiophene) (P3HT), the regioirregular (RI) structure of the naphthalenediimide (NDI)-bithiophene (T2) backbone does not alter the intramolecular steric demand of the chain versus the regioregular (RR) polymer, yielding RI-P(NDI2OD-T2) with similar energetics and optical features as its RR counterpart. By combining the electrical, UV-vis/infrared, X-ray diffraction, and electron paramagnetic resonance data and density functional theory calculations, we quantitatively characterized the conductivity, aggregation, crystallinity, and charge density, and simulated the polaron structures, molecular vibrations, and spin density distribution of RR-/RI-P(NDI2OD-T2). Importantly, we observed that RI-P(NDI2OD-T2) can be doped to a greater extent compared to its RR counterpart. This finding is remarkable and contrasts benchmark P3HT, allowing us to uniquely study the role of regiochemistry on the charge-transport properties of n-doped donor-acceptor polymers.
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Affiliation(s)
- Suhao Wang
- Laboratory
of Organic Electronics, Department of Science and Technology, Linköping University, SE-60174 Norrköping, Sweden
| | - Daniele Fazzi
- Institut
für Physikalische Chemie, Department Chemie, Universität zu Köln, Luxemburger Str. 116, D-50939 Köln, Germany
| | - Yuttapoom Puttisong
- Department
of Physics Chemistry and Biology, Linköping
University, SE-581 83 Linköping, Sweden
| | - Mohammad J. Jafari
- Department
of Physics Chemistry and Biology, Linköping
University, SE-581 83 Linköping, Sweden
| | - Zhihua Chen
- Flexterra
Corporation, 8025 Lamon
Avenue, 60077-5318 Skokie, Illinois, United States
| | - Thomas Ederth
- Department
of Physics Chemistry and Biology, Linköping
University, SE-581 83 Linköping, Sweden
| | - Jens W. Andreasen
- Department
of Energy Conversion and Storage, Technical
University of Denmark, Frederiksborgvej 399, 4000 Roskilde, Denmark
| | - Weimin M. Chen
- Department
of Physics Chemistry and Biology, Linköping
University, SE-581 83 Linköping, Sweden
| | - Antonio Facchetti
- Flexterra
Corporation, 8025 Lamon
Avenue, 60077-5318 Skokie, Illinois, United States
- Department
of Chemistry and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208 United
States
| | - Simone Fabiano
- Laboratory
of Organic Electronics, Department of Science and Technology, Linköping University, SE-60174 Norrköping, Sweden
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45
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Kroon R, Hofmann AI, Yu L, Lund A, Müller C. Thermally Activated in Situ Doping Enables Solid-State Processing of Conducting Polymers. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2019; 31:2770-2777. [PMID: 31303693 PMCID: PMC6614883 DOI: 10.1021/acs.chemmater.8b04895] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Revised: 03/07/2019] [Indexed: 06/10/2023]
Abstract
Free-standing bulk structures encompassing highly doped conjugated polymers are currently heavily explored for wearable electronics as thermoelectric elements, conducting fibers, and a plethora of sensory devices. One-step manufacturing of such bulk structures is challenging because the interaction of dopants with conjugated polymers results in poor solution and solid-state processability, whereas doping of thick conjugated polymer structures after processing suffers from diffusion-limited transport of the dopant. Here, we introduce the concept of thermally activated latent dopants for in situ bulk doping of conjugated polymers. Latent dopants allow for noninteractive coprocessing of dopants and polymers, while thermal activation eliminates any thickness-dependent diffusion and activation limitations. Two latent acid dopants were synthesized in the form of thermal acid generators based on aryl sulfonic acids and an o-nitrobenzyl capping moiety. First, we show that these acid dopant precursors can be coprocessed noninteractively with three different polythiophenes. Second, the polymer films were doped in situ through thermal activation of the dopants. Ultimately, we demonstrate that solid-state processing with a latent acid dopant can be readily carried out and that it is possible to dope more than 100 μm-thick polymer films through thermal activation of the latent dopant.
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Affiliation(s)
| | | | - Liyang Yu
- Department of Chemistry and Chemical
Engineering, Chalmers University of Technology, 41296 Göteborg, Sweden
| | - Anja Lund
- Department of Chemistry and Chemical
Engineering, Chalmers University of Technology, 41296 Göteborg, Sweden
| | - Christian Müller
- Department of Chemistry and Chemical
Engineering, Chalmers University of Technology, 41296 Göteborg, Sweden
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46
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Aubry TJ, Axtell JC, Basile VM, Winchell KJ, Lindemuth JR, Porter TM, Liu JY, Alexandrova AN, Kubiak CP, Tolbert SH, Spokoyny AM, Schwartz BJ. Dodecaborane-Based Dopants Designed to Shield Anion Electrostatics Lead to Increased Carrier Mobility in a Doped Conjugated Polymer. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1805647. [PMID: 30672037 DOI: 10.1002/adma.201805647] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Revised: 12/07/2018] [Indexed: 06/09/2023]
Abstract
One of the most effective ways to tune the electronic properties of conjugated polymers is to dope them with small-molecule oxidizing agents, creating holes on the polymer and molecular anions. Undesirably, strong electrostatic attraction from the anions of most dopants localizes the holes created on the polymer, reducing their mobility. Here, a new strategy utilizing a substituted boron cluster as a molecular dopant for conjugated polymers is employed. By designing the cluster to have a high redox potential and steric protection of the core-localized electron density, highly delocalized polarons with mobilities equivalent to films doped with no anions present are obtained. AC Hall effect measurements show that P3HT films doped with these boron clusters have conductivities and polaron mobilities roughly an order of magnitude higher than films doped with F4 TCNQ, even though the boron-cluster-doped films have poor crystallinity. Moreover, the number of free carriers approximately matches the number of boron clusters, yielding a doping efficiency of ≈100%. These results suggest that shielding the polaron from the anion is a critically important aspect for producing high carrier mobility, and that the high polymer crystallinity required with dopants such as F4 TCNQ is primarily to keep the counterions far from the polymer backbone.
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Affiliation(s)
- Taylor J Aubry
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA
| | - Jonathan C Axtell
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA
| | - Victoria M Basile
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA
| | - K J Winchell
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA
| | | | - Tyler M Porter
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Ji-Yuan Liu
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA
- Key Laboratory for Advanced Materials, Center for Computational Chemistry and Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China
| | - Anastassia N Alexandrova
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA
| | - Clifford P Kubiak
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Sarah H Tolbert
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA
- Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA
| | - Alexander M Spokoyny
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA
| | - Benjamin J Schwartz
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA, 90095-1569, USA
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47
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Vijayakumar V, Zaborova E, Biniek L, Zeng H, Herrmann L, Carvalho A, Boyron O, Leclerc N, Brinkmann M. Effect of Alkyl Side Chain Length on Doping Kinetics, Thermopower, and Charge Transport Properties in Highly Oriented F 4TCNQ-Doped PBTTT Films. ACS APPLIED MATERIALS & INTERFACES 2019; 11:4942-4953. [PMID: 30644706 DOI: 10.1021/acsami.8b17594] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Doping of polymer semiconductors such as poly(2,5-bis(3-alkylthiophen-2-yl)thieno[3,2- b]thiophene) (PBTTT) with acceptor molecules such as 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) is widely used to tune the charge transport and thermoelectric (TE) properties in thin films. However, the mechanism of dopant insertion in the polymer matrix, insertion kinetics, and the ultimate doping levels reached have been investigated only marginally. This contribution addresses the effect of alkyl side chain length on the doping mechanism of a series of PBTTTs with linear side chains ranging from n-octyl to n-octyldecyl. The study focuses on thin films oriented by high-temperature rubbing and sequentially doped in F4TCNQ solution. Structure-property correlations are established as a function of side chain length by a combination of transmission electron microscopy, polarized UV-vis-NIR spectroscopy, and charge transport/thermopower measurements. Intercalation of F4TCNQ into the layers of side chains results in the expansion of the lattice along the side chains and the contraction along the π-stacking direction for all polymers. The extent of lattice expansion decreases with the increasing side chain length. UV-vis-NIR spectroscopy demonstrates integer charge transfer for all investigated PBTTTs. The doping kinetics and the final doping level depend on both the side chain length and packing. Highly disordered n-octyl and crystalline n-octyldecyl side chain layers tend to hamper dopant diffusion in the side chain layers contrary to n-dodecyl side chains that can host the highest proportion of dopants. Consequently, the best TE properties are observed for C12-PBTTT films. Alignment of the polymers significantly enhances the TE performance by increasing the charge conductivity and the thermopower along the rubbing direction. Aligned films of C12-PBTTT show charge conductivities of 193 S cm-1 along the rubbing direction and power factors of approximately 100 μW m-1 K-2 versus a few μW m-1 K-2 for nonoriented films.
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Affiliation(s)
- Vishnu Vijayakumar
- Université de Strasbourg, CNRS, ICS UPR 22 , F-67000 Strasbourg , France
| | - Elena Zaborova
- CiNaM, UMR 7325, Université Aix Marseille , Campus de Luminy, Case 913 , 13288 Marseille Cedex 9, France
- Université de Strasbourg, CNRS, ICPEES UMR 7515 , F-67087 Strasbourg , France
| | - Laure Biniek
- Université de Strasbourg, CNRS, ICS UPR 22 , F-67000 Strasbourg , France
| | - Huiyan Zeng
- Université de Strasbourg, CNRS, ICS UPR 22 , F-67000 Strasbourg , France
| | - Laurent Herrmann
- Université de Strasbourg, CNRS, ICS UPR 22 , F-67000 Strasbourg , France
| | - Alain Carvalho
- Université de Strasbourg, CNRS, ICS UPR 22 , F-67000 Strasbourg , France
| | - Olivier Boyron
- Laboratoire de Chimie Catalyse Polymères et Procédés (C2P2) , Université de Lyon 1, CPE Lyon, CNRS UMR 5265 , Bat 308F, 43 bd du 11 Novembre 1918 , 69616 Villeurbanne , France
| | - Nicolas Leclerc
- Université de Strasbourg, CNRS, ICPEES UMR 7515 , F-67087 Strasbourg , France
| | - Martin Brinkmann
- Université de Strasbourg, CNRS, ICS UPR 22 , F-67000 Strasbourg , France
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48
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Hynynen J, Järsvall E, Kroon R, Zhang Y, Barlow S, Marder SR, Kemerink M, Lund A, Müller C. Enhanced Thermoelectric Power Factor of Tensile Drawn Poly(3-hexylthiophene). ACS Macro Lett 2019; 8:70-76. [PMID: 30701126 PMCID: PMC6344060 DOI: 10.1021/acsmacrolett.8b00820] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Accepted: 12/19/2018] [Indexed: 01/16/2023]
Abstract
The thermoelectric power factor of a broad range of organic semiconductors scales with their electrical conductivity according to a widely obeyed power law, and therefore, strategies that permit this empirical trend to be surpassed are highly sought after. Here, tensile drawing of the conjugated polymer poly(3-hexylthiophene) (P3HT) is employed to create free-standing films with a high degree of uniaxial alignment. Along the direction of orientation, sequential doping with a molybdenum tris(dithiolene) complex leads to a 5-fold enhancement of the power factor beyond the predicted value, reaching up to 16 μW m-1 K-2 for a conductivity of about 13 S cm-1. Neither stretching nor doping affect the glass transition temperature of P3HT, giving rise to robust free-standing materials that are of interest for the design of flexible thermoelectric devices.
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Affiliation(s)
- Jonna Hynynen
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, 41296 Göteborg, Sweden
| | - Emmy Järsvall
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, 41296 Göteborg, Sweden
| | - Renee Kroon
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, 41296 Göteborg, Sweden
| | - Yadong Zhang
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
| | - Stephen Barlow
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
| | - Seth R. Marder
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
| | - Martijn Kemerink
- Complex Materials and Devices, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
| | - Anja Lund
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, 41296 Göteborg, Sweden
| | - Christian Müller
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, 41296 Göteborg, Sweden
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49
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Voss MG, Scholes DT, Challa JR, Schwartz BJ. Ultrafast transient absorption spectroscopy of doped P3HT films: distinguishing free and trapped polarons. Faraday Discuss 2019; 216:339-362. [PMID: 31038132 DOI: 10.1039/c8fd00210j] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
It is generally presumed that the vast majority of carriers created by chemical doping of semiconducting polymer films are coulombically trapped by the counteranion, with only a small fraction that are free and responsible for the increased conductivity essential for organic electronic applications. At higher doping levels, it is also possible for bipolarons to form, which are expected to be less conductive than single polarons. Unfortunately, there is no simple way to distinguish free polarons, trapped polarons and bipolarons using steady-state spectroscopy. Thus, in this work, we use ultrafast transient absorption spectroscopy to study the dynamics of polarons in 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TNCQ)-doped films of poly(3-hexylthiophene-2,5-diyl) (P3HT) as a function of dopant concentration and excitation wavelength. When exciting on the red side of the polaron P1 transition, our transient absorption spectra and kinetics match well with what is expected for free 2-D-delocalized polarons; the measurements are not consistent with a recent theory of doped conjugated polymer electronic structure that suggests that the half-filled state lies deeper in the conduction band rather than in the bandgap. As we tune the excitation wavelength to the blue, our measurements reveal an increasing amount of slower transient kinetics that are consistent with the presence of coulombically-trapped polarons rather than bipolarons. Taking advantage of their distinct ultrafast relaxation kinetics as a type of action spectroscopy, we are able to extract the steady-state absorption spectra of free and trapped polarons as a function of dopant concentration. By comparing the results to theoretical models, we determine that in F4TCNQ-doped P3HT films, trapped polarons sit ∼0.4 nm away from the anion while free polarons reside between 0.7 and 0.9 nm from the counteranion. Perhaps counterintuitively, the ratio of trapped to free polarons increases at higher doping levels, an observation that is consistent with a plateau in the concentration-dependent conductivity of F4TCNQ-doped P3HT films.
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Affiliation(s)
- Matthew G Voss
- Department of Chemistry and Biochemistry, University of California Los Angeles (UCLA), Los Angeles, CA 90095-1569, USA.
| | - D Tyler Scholes
- Department of Chemistry and Biochemistry, University of California Los Angeles (UCLA), Los Angeles, CA 90095-1569, USA.
| | - J Reddy Challa
- Department of Chemistry and Biochemistry, University of California Los Angeles (UCLA), Los Angeles, CA 90095-1569, USA.
| | - Benjamin J Schwartz
- Department of Chemistry and Biochemistry, University of California Los Angeles (UCLA), Los Angeles, CA 90095-1569, USA.
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50
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Neelamraju B, Watts KE, Pemberton JE, Ratcliff EL. Correlation of Coexistent Charge Transfer States in F 4TCNQ-Doped P3HT with Microstructure. J Phys Chem Lett 2018; 9:6871-6877. [PMID: 30450910 DOI: 10.1021/acs.jpclett.8b03104] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Understanding the interaction between organic semiconductors (OSCs) and dopants in thin films is critical for device optimization. The proclivity of a doped OSC to form free charges is predicated on the chemical and electronic interactions that occur between dopant and host. To date, doping has been assumed to occur via one of two mechanistic pathways: an integer charge transfer (ICT) between the OSC and dopant or hybridization of the frontier orbitals of both molecules to form a partial charge transfer complex (CPX). Using a combination of spectroscopies, we demonstrate that CPX and ICT states are present simultaneously in F4TCNQ-doped P3HT films and that the nature of the charge transfer interaction is strongly dependent on the local energetic environment. Our results suggest a multiphase model, where the local charge transfer mechanism is defined by the electronic driving force, governed by local microstructure in regioregular and regiorandom P3HT.
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