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Guo P, Miao W, Liu G, Tong J, Liang Q, Zhang Y, Li M, Li J, Wang C, Wang E, Wu H, Xia Y. Twisted Alkylthiothien‐2‐yl Flanks and Extended Conjugation Length Synergistically Enhanced Photovoltaic Performance by Boosting Dielectric Constant and Carriers Kinetic Characteristics. MACROMOL CHEM PHYS 2021. [DOI: 10.1002/macp.202100030] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Pengzhi Guo
- National Green Coating Equipment and Technology Research Centre Lanzhou Jiaotong University Lanzhou 730070 P. R. China
- School of Materials Science and Engineering Lanzhou Jiaotong University Lanzhou 730070 P. R. China
| | - Wentao Miao
- National Green Coating Equipment and Technology Research Centre Lanzhou Jiaotong University Lanzhou 730070 P. R. China
| | - Guanghong Liu
- State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 P. R. China
| | - Junfeng Tong
- School of Materials Science and Engineering Lanzhou Jiaotong University Lanzhou 730070 P. R. China
| | - Quanbin Liang
- State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 P. R. China
| | - Youdan Zhang
- National Green Coating Equipment and Technology Research Centre Lanzhou Jiaotong University Lanzhou 730070 P. R. China
| | - Miaomiao Li
- School of Materials Science and Engineering Tianjin University Tianjin 300072 P. R. China
| | - Jianfeng Li
- School of Materials Science and Engineering Lanzhou Jiaotong University Lanzhou 730070 P. R. China
| | - Chenglong Wang
- National Green Coating Equipment and Technology Research Centre Lanzhou Jiaotong University Lanzhou 730070 P. R. China
| | - Ergang Wang
- National Green Coating Equipment and Technology Research Centre Lanzhou Jiaotong University Lanzhou 730070 P. R. China
- Department of Chemical and Biological Engineering/Polymer Technology Chalmers University of Technology SE‐412 96 Göteborg Sweden
| | - Hongbin Wu
- State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 P. R. China
| | - Yangjun Xia
- School of Materials Science and Engineering Lanzhou Jiaotong University Lanzhou 730070 P. R. China
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2
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An L, Huang Y, Wang X, Liang Z, Li J, Tong J. Fluorination Effect for Highly Conjugated Alternating Copolymers Involving Thienylenevinylene-Thiophene-Flanked Benzodithiophene and Benzothiadiazole Subunits in Photovoltaic Application. Polymers (Basel) 2020; 12:E504. [PMID: 32106540 PMCID: PMC7254375 DOI: 10.3390/polym12030504] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Revised: 02/21/2020] [Accepted: 02/22/2020] [Indexed: 01/28/2023] Open
Abstract
Two two-dimensional (2D) donor-acceptor (D-A) type conjugated polymers (CPs), namely, PBDT-TVT-BT and PBDT-TVT-FBT, in which two ((E)-(4,5-didecylthien-2-yl)vinyl)- 5-thien-2-yl (TVT) side chains were introduced into 4,8-position of benzo[1,2-b:4,5-b']dithiophene (BDT) to synthesize the highly conjugated electron-donating building block BDT-TVT, and benzothiadiazole (BT) and/or 5,6-difluoro-BT as electron-accepting unit, were designed to systematically ascertain the impact of fluorination on thermal stability, optoelectronic property, and photovoltaic performance. Both resultant copolymers exhibited the lower bandgap (1.60 ~ 1.69 eV) and deeper highest occupied molecular orbital energy level (EHOMO, -5.17 ~ -5.37 eV). It was found that the narrowed absorption, deepened EHOMO and weakened aggregation in solid film but had insignificant influence on thermal stability after fluorination in PBDT-TVT-FBT. Accordingly, a PBDT-TVT-FBT-based device yielded 16% increased power conversion efficiency (PCE) from 4.50% to 5.22%, benefited from synergistically elevated VOC, JSC, and FF, which was mainly originated from deepened EHOMO, increased μh, μe, and more balanced μh/μe ratio, higher exciton dissociation probability and improved microstructural morphology of the photoactive layer as a result of incorporating fluorine into the polymer backbone.
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Affiliation(s)
- Lili An
- Key Laboratory for Utility of Environment- Friendly Composite Materials and Biomass in University of Gansu Province, School of Chemical Engineering, Northwest Minzu University, Lanzhou 730030, China
| | - Yubo Huang
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; (Y.H.); (X.W.); (Z.L.); (J.L.); (J.T.)
| | - Xu Wang
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; (Y.H.); (X.W.); (Z.L.); (J.L.); (J.T.)
| | - Zezhou Liang
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; (Y.H.); (X.W.); (Z.L.); (J.L.); (J.T.)
- CAS Key Laboratory of Bio-based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
| | - Jianfeng Li
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; (Y.H.); (X.W.); (Z.L.); (J.L.); (J.T.)
| | - Junfeng Tong
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; (Y.H.); (X.W.); (Z.L.); (J.L.); (J.T.)
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3
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Elevated Photovoltaic Performance in Medium Bandgap Copolymers Composed of Indacenodi-thieno[3,2- b]thiophene and Benzothiadiazole Subunits by Modulating the π-Bridge. Polymers (Basel) 2020; 12:polym12020368. [PMID: 32046028 PMCID: PMC7077401 DOI: 10.3390/polym12020368] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Revised: 01/10/2020] [Accepted: 01/13/2020] [Indexed: 11/28/2022] Open
Abstract
Two random conjugated polymers (CPs), namely, PIDTT-TBT and PIDTT-TFBT, in which indacenodithieno[3,2-b]thiophene (IDTT), 3-octylthiophene, and benzothiadiazole (BT) were in turn utilized as electron-donor (D), π-bridge, and electron-acceptor (A) units, were synthesized to comprehensively analyze the impact of reducing thiophene π-bridge and further fluorination on photostability and photovoltaic performance. Meanwhile, the control polymer PIDTT-DTBT with alternating structure was also prepared for comparison. The broadened and enhanced absorption, down-shifted highest occupied molecular orbital energy level (EHOMO), more planar molecular geometry thus enhanced the aggregation in the film state, but insignificant impact on aggregation in solution and photostability were found after both reducing thiophene π-bridge in PIDTT-TBT and further fluorination in PIDTT-TFBT. Consequently, PIDTT-TBT-based device showed 185% increased PCE of 5.84% profited by synergistically elevated VOC, JSC, and FF than those of its counterpart PIDTT-DTBT, and this improvement was chiefly ascribed to the improved absorption, deepened EHOMO, raised μh and more balanced μh/μe, and optimized morphology of photoactive layer. However, the dropped PCE was observed after further fluorination in PIDTT-TFBT, which was mainly restricted by undesired morphology for photoactive layer as a result of strong aggregation even if in the condition of the upshifted VOC. Our preliminary results can demonstrate that modulating the π-bridge in polymer backbone was an effective method with the aim to enhance the performance for solar cell.
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4
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An L, Tong J, Yang C, Zhao X, Wang X, Xia Y. Impact of alkyl side chain on the photostability and optoelectronic properties of indacenodithieno[3,2‐
b
]thiophene‐
alt
‐naphtho[1,2‐
c
:5,6‐
c
′]bis[1,2,5]thiadiazole medium bandgap copolymers. POLYM INT 2019. [DOI: 10.1002/pi.5936] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Lili An
- School of Chemical Engineering, Northwest Minzu UniversityKey Laboratory for Utility of Environment‐Friendly Composite Materials and Biomass in University of Gansu Province Lanzhou P. R. China
| | - Junfeng Tong
- School of Materials Science and EngineeringLanzhou Jiaotong University Lanzhou P. R. China
| | - Chunyan Yang
- School of Materials Science and EngineeringLanzhou Jiaotong University Lanzhou P. R. China
| | - Xu Zhao
- Institute of Soil, Fertilizer and Water‐saving AgricultureGansu Academy of Agricultural Sciences Lanzhou P. R. China
| | - Xunchang Wang
- CAS Key Laboratory of Bio‐based Materials, Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of Sciences Qingdao P. R. China
| | - Yangjun Xia
- School of Materials Science and EngineeringLanzhou Jiaotong University Lanzhou P. R. China
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5
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Agbolaghi S. Pure and complex nanostructures using poly[bis(triiso‐propylsilylethynyl) benzodithiophene‐bis(decyltetradecyl‐thien) naphthobisthiadiazole], carbon nanotubes and reduced graphene oxide for high‐performance polymer solar cells. POLYM INT 2019. [DOI: 10.1002/pi.5872] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Samira Agbolaghi
- Chemical Engineering Department, Faculty of EngineeringAzarbaijan Shahid Madani University Tabriz Iran
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6
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Synthesis and Photovoltaic Effect of Electron-Withdrawing Units for Low Band Gap Conjugated Polymers Bearing Bi(thienylenevinylene) Side Chains. Polymers (Basel) 2019; 11:polym11091461. [PMID: 31500164 PMCID: PMC6780057 DOI: 10.3390/polym11091461] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 08/30/2019] [Accepted: 09/02/2019] [Indexed: 01/08/2023] Open
Abstract
A novel (E)-5-(2-(5-alkylthiothiophen-2-yl)vinyl)thien-2-yl (TVT)-comprising benzo[1,2-b:4,5-b']dithiophene (BDT) derivative (BDT-TVT) was designed and synthetized to compose two donor-acceptor (D-A) typed copolymers (PBDT-TVT-ID and PBDT-TVT-DTNT) with the electron-withdrawing unit isoindigo (ID) and naphtho[1,2-c:5,6-c']bis[1,2,5]thiadiazole (NT), respectively. PBDT-TVT-ID and PBDT-TVT-DTNT showed good thermal stability (360 °C), an absorption spectrum from 300 nm to 760 nm and a relatively low lying energy level of Highest Occupied Molecular Orbital (EHOMO) (-5.36 to -5.45 eV), which could obtain a large open-circuit voltage (Voc) from photovoltaic devices with PBDT-TVT-ID or PBDT-TVT-DTNT. The photovoltaic devices with ITO/PFN/polymers: PC71BM/MoO3/Ag structure were assembled and exhibited a good photovoltaic performance with a power conversion efficiency (PCE) of 4.09% (PBDT-TVT-ID) and 5.44% (PBDT-TVT-DTNT), respectively. The best PCE of a PBDT-TVT-DTNT/PC71BM-based device mainly originated from its wider absorption, higher hole mobility and favorable photoactive layer morphology.
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7
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Agbolaghi S. Well‐functioned photovoltaics based on nanofibers composed of PBDT‐TIPS‐DTNT‐DT and graphenic precursors thermally modified by polythiophene, polyaniline and polypyrrole. POLYM INT 2019. [DOI: 10.1002/pi.5859] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Samira Agbolaghi
- Chemical Engineering Department, Faculty of EngineeringAzarbaijan Shahid Madani University Tabriz Iran
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8
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Wang Y, Kim SW, Lee J, Matsumoto H, Kim BJ, Michinobu T. Dual Imide-Functionalized Unit-Based Regioregular D-A 1-D-A 2 Polymers for Efficient Unipolar n-Channel Organic Transistors and All-Polymer Solar Cells. ACS APPLIED MATERIALS & INTERFACES 2019; 11:22583-22594. [PMID: 31142111 DOI: 10.1021/acsami.9b05537] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The demand for the development of more promising n-type semiconducting polymers with excellent electron mobilities and air stabilities is growing fast. In this study, we designed and synthesized a series of new dual imide-functionalized derivative-based regioregular D-A1-D-A2 copolymers with different side chains (namely, PNT-R, R = 2-decyltetradecyl (DT), 2-octadecyldodecyl (OD), and 2-hexyldecyl (HD)). These new polymers PNT-R showed strong electron affinities with deep lowest unoccupied molecular orbital (LUMO) levels down to -4.01 eV, indicating that they are promising electron-transporting materials. To optimize the electron mobility, side-chain engineering was adopted. Thus, the effects of the side-chain length on their optoelectronic and charge-transport properties as well as the performances of all-polymer solar cells (all-PSCs) were systematically investigated. Shortening the side-chain length significantly expanded the absorption range, deepened the LUMO energy level, strengthened the molecular packing properties, and developed more crystalline microstructures in the solid state, as evidenced by the ultraviolet-visible absorption spectra, cyclic voltammetry, synchrotron two-dimensional grazing-incidence wide-angle X-ray scattering, and atomic force microscopy measurements. Consequently, the highest electron mobility of 1.05 cm2 V-1 s-1 was achieved in PNT-HD-based organic thin-film transistors (OTFTs). Also, PNT-R polymers were successfully applied as electron acceptors in all-PSCs. In good agreement with the OTFT results, the highest power conversion efficiency of 6.62% was obtained for the PNT-HD-blend film due to its excellent short-circuit current ( Jsc) value (12.07 mA cm-2), which was much higher than that of the PNT-DT- and PNT-OD-based all-PSCs (7.67 and 10.19 mA cm-2, respectively). By further investigating the dependence of the Jsc and open-circuit voltage ( Voc) on the illuminated light intensity ( P), the high Jsc value of the PNT-HD-based device was found to originate from its highly suppressed mono- and bimolecular recombination as well as efficient exciton dissociation and charge transfer at the donor-acceptor interfaces. Overall, this study provides insights into the naphthalenediimide-based regioregular D-A1-D-A2 copolymers used in all-PSCs and offers important design guidelines for future development of n-type semiconducting polymers.
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Affiliation(s)
- Yang Wang
- Department of Materials Science and Engineering , Tokyo Institute of Technology , 2-12-1 Ookayama , Meguro-ku, Tokyo 152-8552 , Japan
| | - Sang Woo Kim
- Department of Chemical and Biomolecular Engineering , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Republic of Korea
| | - Junbok Lee
- Department of Chemical and Biomolecular Engineering , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Republic of Korea
| | - Hidetoshi Matsumoto
- Department of Materials Science and Engineering , Tokyo Institute of Technology , 2-12-1 Ookayama , Meguro-ku, Tokyo 152-8552 , Japan
| | - Bumjoon J Kim
- Department of Chemical and Biomolecular Engineering , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Republic of Korea
| | - Tsuyoshi Michinobu
- Department of Materials Science and Engineering , Tokyo Institute of Technology , 2-12-1 Ookayama , Meguro-ku, Tokyo 152-8552 , Japan
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9
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Zhang X, Zhang M, Tong J, Guo P, Wang X, Liang Z, Wang Y, Xia Y. Synthesis and photovoltaic investigation of dithieno[2,3‐
d
:2′,3′‐
d
′]‐benzo[1,2‐
b
:3,4‐
b
′:5,6‐
d
″]trithiophene‐based conjugated polymer with an enlarged π‐conjugated system. POLYM ADVAN TECHNOL 2019. [DOI: 10.1002/pat.4562] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xiaofang Zhang
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry EducationLanzhou Jiaotong University Lanzhou PR China
| | - Minjing Zhang
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry EducationLanzhou Jiaotong University Lanzhou PR China
| | - Junfeng Tong
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry EducationLanzhou Jiaotong University Lanzhou PR China
- School of Materials Science and EngineeringLanzhou Jiaotong University Lanzhou PR China
| | - Pengzhi Guo
- National Green Coating Technology and Equipment Research CenterLanzhou Jiaotong University Lanzhou PR China
| | - Xunchang Wang
- CAS Key Laboratory of Bio‐based Materials, Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of Sciences Qingdao China
| | - Zezhou Liang
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry EducationLanzhou Jiaotong University Lanzhou PR China
| | - Yufei Wang
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry EducationLanzhou Jiaotong University Lanzhou PR China
| | - Yangjun Xia
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry EducationLanzhou Jiaotong University Lanzhou PR China
- School of Materials Science and EngineeringLanzhou Jiaotong University Lanzhou PR China
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10
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Zhang M, Zhu L, Guo P, Wang X, Tong J, Zhang X, Jia Y, Yang R, Xia Y, Wang C. Effect of Flank Rotation on the Photovoltaic Properties of Dithieno[2,3- d:2',3'- d']benzo[1,2- b:4,5- b']dithiophene-Based Narrow Band Gap Copolymers. Polymers (Basel) 2019; 11:E239. [PMID: 30960223 PMCID: PMC6419082 DOI: 10.3390/polym11020239] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Revised: 01/27/2019] [Accepted: 01/27/2019] [Indexed: 11/30/2022] Open
Abstract
Side chain engineering has been an effective approach to modulate the solution processability, optoelectronic properties and miscibility of conjugated polymers (CPs) for organic/polymeric photovoltaic cells (PVCs). As compared with the most commonly used method of introducing alkyl chains, the employment of alkyl-substituted aryl flanks would provide two-dimensional (2-D) CPs having solution processability alongside additional merits like deepened highest occupied molecular orbital (HOMO) energy levels, increased absorption coefficient and charger transporting, etc. In this paper, the triple C≡C bond was used as conjugated linker to decrease the steric hindrance between the flanks of 4,5-didecylthien-2-yl (T) and dithieno[2,3-d:2',3'-d']benzo[1,2-b:4,5-b']dithiophene (DTBDT) core. In addition, an alternating CP derived from 4,5-didecylthien-2-yl-ethynyl (TE) flanked DTBDT, and 4,9-bis(4-octylthien-2-yl) naphtho[1,2-c:5,6-c']bis[1,2,5]thiadiazole (DTNT), named as PDTBDT-TE-DTNT, was synthesized and characterized. As compared with the controlled PDTBDT-T-DTNT, which was derived from 4,5-didecylthien-2-yl flanked DTBDT and DTNT, the results for exciton dissociation probability, density functional theory (DFT), time-resolved photoluminescence (PL) measurements, etc., revealed that the lower steric hindrance between TE and DTBDT might lead to the easier rotation of the TE flanks, thus contributing to the decrease of the exciton lifetime and dissociation probability, finally suppressing the short-circuit current density (JSC), etc., of the photovoltaic devices from PDTBDT-TE-DTNT.
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Affiliation(s)
- Mingjing Zhang
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China.
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education, Lanzhou Jiaotong University, Lanzhou 730070, China.
| | - Liangjian Zhu
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education, Lanzhou Jiaotong University, Lanzhou 730070, China.
| | - Pengzhi Guo
- National Green Coating Technology and Equipment Engineering Technology Research Center, Lanzhou Jiaotong University, Lanzhou 730070, China.
| | - Xunchang Wang
- CAS Key Laboratory of Bio-Based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China.
| | - Junfeng Tong
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China.
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education, Lanzhou Jiaotong University, Lanzhou 730070, China.
| | - Xiaofang Zhang
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China.
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education, Lanzhou Jiaotong University, Lanzhou 730070, China.
| | - Yongjian Jia
- National Green Coating Technology and Equipment Engineering Technology Research Center, Lanzhou Jiaotong University, Lanzhou 730070, China.
| | - Renqiang Yang
- CAS Key Laboratory of Bio-Based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China.
| | - Yangjun Xia
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China.
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education, Lanzhou Jiaotong University, Lanzhou 730070, China.
| | - Chenglong Wang
- National Green Coating Technology and Equipment Engineering Technology Research Center, Lanzhou Jiaotong University, Lanzhou 730070, China.
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11
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Zhang X, Wang F, Tong J, Zhang M, Guo P, Li J, Xia Y, Wang C, Wu H. Systematically investigating the influence of inserting alkylthiophene spacers on the aggregation, photo-stability and optoelectronic properties of copolymers from dithieno[2,3-d:2′,3′-d′]benzo[1,2-b:4,5-b′]dithiophene and benzothiadiazole derivatives. Polym Chem 2019. [DOI: 10.1039/c8py01764f] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
PDTBDT-SBT and PDTBDT-SFBT presented a superior trade-off between band gaps and photo-stabilities.
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Affiliation(s)
- Xiaofang Zhang
- School of Materials Science and Engineering
- Lanzhou Jiaotong University
- Lanzhou
- P.R. China
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education
| | - Fang Wang
- School of Materials Science and Engineering
- Lanzhou Jiaotong University
- Lanzhou
- P.R. China
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education
| | - Junfeng Tong
- School of Materials Science and Engineering
- Lanzhou Jiaotong University
- Lanzhou
- P.R. China
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education
| | - Mingjin Zhang
- School of Materials Science and Engineering
- Lanzhou Jiaotong University
- Lanzhou
- P.R. China
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education
| | - Pengzhi Guo
- National green coating technology and equipment Engineering Technology Research Center
- Lanzhou Jiaotong University
- Lanzhou
- P.R. China
| | - Jianfeng Li
- School of Materials Science and Engineering
- Lanzhou Jiaotong University
- Lanzhou
- P.R. China
| | - Yangjun Xia
- School of Materials Science and Engineering
- Lanzhou Jiaotong University
- Lanzhou
- P.R. China
| | - Chenglong Wang
- National green coating technology and equipment Engineering Technology Research Center
- Lanzhou Jiaotong University
- Lanzhou
- P.R. China
| | - Hongbin Wu
- Institute of Polymer Optoelectronic Materials and Devices
- State Key Laboratory of Luminescent Materials and Devices
- South China University of Technology
- Guangzhou 510640
- P.R. China
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12
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Tong J, An L, Lv J, Guo P, Wang X, Yang C, Xia Y. Enhanced Photovoltaic Performance in D-π-A Copolymers Containing Triisopropylsilylethynyl-Substituted Dithienobenzodithiophene by Modulating the Electron-Deficient Units. Polymers (Basel) 2018; 11:E12. [PMID: 30959996 PMCID: PMC6401703 DOI: 10.3390/polym11010012] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Revised: 12/16/2018] [Accepted: 12/19/2018] [Indexed: 11/16/2022] Open
Abstract
Three alternated D-π-A type 5,10-bis(triisopropylsilylethynyl)dithieno[2,3-d:2',3'-d']-benzo[1,2-b:4,5-b']dithiophene (DTBDT-TIPS)-based semiconducting conjugated copolymers (CPs), PDTBDT-TIPS-DTBT-OD, PDTBDT-TIPS-DTFBT-OD, and PDTBDT-TIPS-DTNT-OD, bearing different A units, including benzothiadiazole (BT), 5,6-difluorinated-BT (FBT) and naphtho[1,2-c:5,6-c']-bis[1,2,5]thiadiazole (NT), were designed and synthesized to investigate the impact of the variation in electron-deficient units on the properties of these photovoltaic polymers. It was exhibited that the down-shifted highest occupied molecular orbital energy level (EHOMO), the enhanced aggregation in both the chlorobenzene solution and the solid film, as well as the better molecular planarity, were achieved using methods involving fluorination and the replacement of BT with NT on the polymer backbone. The absorption profile was little changed upon fluorination; however, it was greatly broadened during replacement of BT with NT. Consequently, the optimized photovoltaic device based on the PDTBDT-TIPS-DTNT-OD exhibited synchronous enhancements in the open-circuit voltage (VOC) of 0.88 V, the short-circuit current density (JSC) of 7.21 mA cm-2, and the fill factor (FF) of 52.99%, resulting in a drastic elevation in the PCE by 129% to 3.37% compared to that of the PDTBDT-TIPS-DTBT-OD. This was triggered by PDTBDT-TIPS-DTNT-OD's broadened absorption, deepened EHOMO, improved coplanarity, and enhanced SCLC mobility (which increased 3.9 times), as well as a favorable morphology of the active layer. Unfortunately, the corresponding PCE deteriorated after incorporating fluorine into the BT, due to the oversized aggregation and large phase separation morphology in the blend films, severely impairing its JSC. Our preliminary results demonstrated that the replacement of BT with NT in a D-π-A type polymer backbone was an effective strategy of tuning the molecular structure to achieve highly efficient polymer solar cells (PSCs).
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Affiliation(s)
- Junfeng Tong
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China.
| | - Lili An
- School of Chemical Engineering, Northwest Minzu University, Lanzhou 730030, China.
| | - Jie Lv
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China.
| | - Pengzhi Guo
- National Green Coating Technology and Equipment Research Center, Lanzhou Jiaotong University, Lanzhou 730070, China.
| | - Xunchang Wang
- CAS Key Laboratory of Bio-Based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China.
| | - Chunyan Yang
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China.
| | - Yangjun Xia
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China.
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Weng C, Wang W, Liang J, Wang G, Tan S, Shen P. Fluorobenzotriazole-Based Medium-Bandgap Conjugated D-A Copolymers for Applications to Fullerene-Based and Nonfullerene Polymer Solar Cells. ACTA ACUST UNITED AC 2018. [DOI: 10.1002/pola.29207] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Chao Weng
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry; Xiangtan University; Xiangtan 411105 China
| | - Wengong Wang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry; Xiangtan University; Xiangtan 411105 China
| | - Jingtang Liang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry; Xiangtan University; Xiangtan 411105 China
| | - Guo Wang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry; Xiangtan University; Xiangtan 411105 China
| | - Songting Tan
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry; Xiangtan University; Xiangtan 411105 China
| | - Ping Shen
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry; Xiangtan University; Xiangtan 411105 China
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14
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Tong J, An L, Li J, Lv J, Guo P, Li L, Zhang P, Yang C, Xia Y, Wang C. Effects of alkyl side chain length of low bandgap naphtho[1,2-c:5,6-c′]bis[1,2,5]thiadiazole-based copolymers on the optoelectronic properties of polymer solar cells. ACTA ACUST UNITED AC 2018. [DOI: 10.1002/pola.29166] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Junfeng Tong
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education; Lanzhou Jiaotong University; Lanzhou 730070 People's Republic of China
| | - Lili An
- School of Chemical Engineering; Northwest Minzu University; Lanzhou 730030 People's Republic of China
| | - Jianfeng Li
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education; Lanzhou Jiaotong University; Lanzhou 730070 People's Republic of China
| | - Jie Lv
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education; Lanzhou Jiaotong University; Lanzhou 730070 People's Republic of China
| | - Pengzhi Guo
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education; Lanzhou Jiaotong University; Lanzhou 730070 People's Republic of China
| | - Liujun Li
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education; Lanzhou Jiaotong University; Lanzhou 730070 People's Republic of China
| | - Peng Zhang
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education; Lanzhou Jiaotong University; Lanzhou 730070 People's Republic of China
| | - Chunyan Yang
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education; Lanzhou Jiaotong University; Lanzhou 730070 People's Republic of China
| | - Yangjun Xia
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education; Lanzhou Jiaotong University; Lanzhou 730070 People's Republic of China
| | - Chenglong Wang
- National Green Coating Technology and Equipment Research Center, Lanzhou Jiaotong University; Lanzhou 730070 People's Republic of China
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15
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Synthesis and Characterization of Cyclopentadithiophene and Thienothiophene-Based Polymers for Organic Thin-Film Transistors and Solar Cells. Macromol Res 2018. [DOI: 10.1007/s13233-018-6130-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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16
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36% Enhanced Efficiency of Ternary Organic Solar Cells by Doping a NT-Based Polymer as an Electron-Cascade Donor. Polymers (Basel) 2018; 10:polym10070703. [PMID: 30960628 PMCID: PMC6403668 DOI: 10.3390/polym10070703] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Revised: 06/14/2018] [Accepted: 06/14/2018] [Indexed: 11/16/2022] Open
Abstract
In recent years, ternary organic photovoltaic cells (OPVs) have been dedicated to improving power conversion efficiency (PCE) by broadening optical absorption spectra. Ternary OPVs with different poly[thieno[3,2-b]thiophene-2,5-diyl-alt-4,9-bis(4-(2-decyltetradecyl)thien-2-yl)naphtho[1,2-c:5,6-c']bis[1,2,5]thiadiazole-5,5'-diyl] (PTT-DTNT-DT) doping concentrations were designed and the effect of PTT-DTNT-DT as a complementary electron donor on the performance of OPVs was investigated. The optimized PCE of OPVs was increased from 3.42% to 4.66% by doping 20 wt % PTT-DTNT-DT. The remarkable improvement in the performance of the ternary device is mainly attributed to the sharp increase in the short-circuit current density and fill-factor. The major reasons have been systematically studied from atomic force microscopy, electrochemical impedance spectroscopy, surface energy, space charge limited current and photocurrent behavior. It has been found that the separation of excitons and the transportation of charge are enhanced while light absorption is increased, and the charge recombination also decreases due to the optimization of the cascade energy level and the morphology of the ternary active layer. The results show that it is feasible to improve the performance of ternary OPVs by their complementary absorption.
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17
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Synthesis and Photovoltaic Properties of 2D-Conjugated Polymers Based on Alkylthiothienyl-Substituted Benzodithiophene and Different Accepting Units. Polymers (Basel) 2018; 10:polym10030331. [PMID: 30966366 PMCID: PMC6414851 DOI: 10.3390/polym10030331] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2018] [Revised: 03/14/2018] [Accepted: 03/15/2018] [Indexed: 11/17/2022] Open
Abstract
Two new low bandgap conjugated polymers, PBDTS-ID and PBDTS-DTNT, containing isoindigo (ID) and naphtho[1,2-c:5,6-c′]bis[1,2,5]thiadiazole (NT), respectively, as an electron-deficient unit and alkylthiothienyl-substituted benzodithiophene (BDTS) as an electron-rich unit, were designed and synthesized by palladium-catalyzed Stille polycondensation. Both polymers showed good thermal stability up to 330 °C and broad absorption ranging from 300 to 842 nm. Electrochemical measurement revealed that PBDTS-ID and PBDTS-DTNT exhibited relatively low-lying highest occupied molecular orbital energy levels at −5.40 and −5.24 eV, respectively. These features might be beneficial for obtaining reasonable high open-circuit voltage and high short-circuit current. Polymer solar cells (PSCs) were fabricated with an inverted structure of indium-tin oxide/poly(ethylenimine ethoxylate)/polymer:PC71BM/MoO3/Ag. As a preliminary result, the PSCs based on PBDTS-ID and PBDTS-DTNT exhibited moderate power conversion efficiencies of 2.70% and 2.71%, respectively.
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18
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Gao P, Tong J, Guo P, Li J, Wang N, Li C, Ma X, Zhang P, Wang C, Xia Y. Medium band gap conjugated polymers from thienoacene derivatives and pentacyclic aromatic lactam as promising alternatives of poly(3-hexylthiophene) in photovoltaic application. ACTA ACUST UNITED AC 2017. [DOI: 10.1002/pola.28874] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Peili Gao
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education; Lanzhou Jiaotong University; Lanzhou 730070 People's Republic of China
| | - Junfeng Tong
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education; Lanzhou Jiaotong University; Lanzhou 730070 People's Republic of China
| | - Pengzhi Guo
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education; Lanzhou Jiaotong University; Lanzhou 730070 People's Republic of China
| | - Jianfeng Li
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education; Lanzhou Jiaotong University; Lanzhou 730070 People's Republic of China
| | - Ningning Wang
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education; Lanzhou Jiaotong University; Lanzhou 730070 People's Republic of China
| | - Cheng Li
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education; Lanzhou Jiaotong University; Lanzhou 730070 People's Republic of China
| | - Xuying Ma
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education; Lanzhou Jiaotong University; Lanzhou 730070 People's Republic of China
| | - Peng Zhang
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education; Lanzhou Jiaotong University; Lanzhou 730070 People's Republic of China
| | - Chenglong Wang
- National Green Coating Technology and Equipment Research Center, Lanzhou Jiaotong University; Lanzhou 730070 People's Republic of China
| | - Yangjun Xia
- Key Laboratory of Optoelectronic Technology and Intelligent Control of Ministry Education; Lanzhou Jiaotong University; Lanzhou 730070 People's Republic of China
- Department of Materials and Chemistry; Biochemistry University of California Santa Barbara; CA 93106-9510 USA
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