1
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Pagano K, Kim JG, Luke J, Tan E, Stewart K, Sazanovich IV, Karras G, Gonev HI, Marsh AV, Kim NY, Kwon S, Kim YY, Alonso MI, Dörling B, Campoy-Quiles M, Parker AW, Clarke TM, Kim YH, Kim JS. Slow vibrational relaxation drives ultrafast formation of photoexcited polaron pair states in glycolated conjugated polymers. Nat Commun 2024; 15:6153. [PMID: 39039039 PMCID: PMC11263616 DOI: 10.1038/s41467-024-50530-7] [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: 08/08/2023] [Accepted: 07/13/2024] [Indexed: 07/24/2024] Open
Abstract
Glycol sidechains are often used to enhance the performance of organic photoconversion and electrochemical devices. Herein, we study their effects on electronic states and electronic properties. We find that polymer glycolation not only induces more disordered packing, but also results in a higher reorganisation energy due to more localised π-electron density. Transient absorption spectroscopy and femtosecond stimulated Raman spectroscopy are utilised to monitor the structural relaxation dynamics coupled to the excited state formation upon photoexcitation. Singlet excitons are initially formed, followed by polaron pair formation. The associated structural relaxation slows down in glycolated polymers (5 ps vs. 1.25 ps for alkylated), consistent with larger reorganisation energy. This slower vibrational relaxation is found to drive ultrafast formation of the polaron pair state (5 ps vs. 10 ps for alkylated). These results provide key experimental evidence demonstrating the impact of molecular structure on electronic state formation driven by strong vibrational coupling.
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Affiliation(s)
- Katia Pagano
- Department of Physics and Centre for Processable Electronics, Imperial College London, London, SW7 2AZ, UK
| | - Jin Gwan Kim
- Department of Chemistry and Research Institute of Molecular Alchemy (RIMA) Gyeongsang National University Jinju, Gyeongnam, 660-701, Republic of Korea
| | - Joel Luke
- Department of Physics and Centre for Processable Electronics, Imperial College London, London, SW7 2AZ, UK
| | - Ellasia Tan
- Department of Physics and Centre for Processable Electronics, Imperial College London, London, SW7 2AZ, UK
| | - Katherine Stewart
- Department of Physics and Centre for Processable Electronics, Imperial College London, London, SW7 2AZ, UK
| | - Igor V Sazanovich
- Central Laser Facility, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Didcot, Oxfordshire, OX11 0QX, UK
| | - Gabriel Karras
- Central Laser Facility, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Didcot, Oxfordshire, OX11 0QX, UK
| | - Hristo Ivov Gonev
- Department of Chemistry, University College London, Christopher Ingold Building, London, WC1H 0AJ, UK
| | - Adam V Marsh
- Physical Science and Engineering Division, KAUST Solar Center (KSC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Na Yeong Kim
- Department of Chemistry and Research Institute of Molecular Alchemy (RIMA) Gyeongsang National University Jinju, Gyeongnam, 660-701, Republic of Korea
| | - Sooncheol Kwon
- Department of Energy and Materials Engineering, Dongguk University-Seoul, Seoul, 04620, Republic of Korea
| | - Young Yong Kim
- Beamline Division, Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea
| | - M Isabel Alonso
- Department of Nanostructured Materials, Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, E-08193, Bellaterra, Spain
| | - Bernhard Dörling
- Department of Nanostructured Materials, Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, E-08193, Bellaterra, Spain
| | - Mariano Campoy-Quiles
- Department of Nanostructured Materials, Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, E-08193, Bellaterra, Spain
| | - Anthony W Parker
- Central Laser Facility, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Didcot, Oxfordshire, OX11 0QX, UK
| | - Tracey M Clarke
- Department of Chemistry, University College London, Christopher Ingold Building, London, WC1H 0AJ, UK
| | - Yun-Hi Kim
- Department of Chemistry and Research Institute of Molecular Alchemy (RIMA) Gyeongsang National University Jinju, Gyeongnam, 660-701, Republic of Korea.
| | - Ji-Seon Kim
- Department of Physics and Centre for Processable Electronics, Imperial College London, London, SW7 2AZ, UK.
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2
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Li Q, Wang R, Yu T, Wang X, Zhang ZG, Zhang Y, Xiao M, Zhang C. Long-Range Charge Separation Enabled by Intramoiety Delocalized Excitations in Copolymer Donors in Organic Photovoltaic Blends. J Phys Chem Lett 2023; 14:7498-7506. [PMID: 37581453 DOI: 10.1021/acs.jpclett.3c01861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/16/2023]
Abstract
For over two decades, most high-performance organic photovoltaics (OPVs) have been made with donor:acceptor bulk heterojunctions with domain sizes limited by exciton diffusion, where charge separation mostly takes place through the dissociation of the interfacial charge-transfer (xCT) excitons. Recently, nonfullerene acceptor (NFA)-based OPVs have shown excellent compatibility to device structures with large domains in active layers. However, it remains elusive how the excitations that are distant from the interfaces are converted into free charges. Here, we report the identification of a new charge separation channel in model copolymer/NFA blends mediated by intra-moiety delocalized excitations in both planar heterojunctions and donor-enriched bulk heterojunctions. The delocalized excitations induced by interchromophore electronic interactions in copolymer donors mediate the long-range charge separation and dissociate into free charges without forming the bound xCT states first, releasing the constraints associated with the short exciton diffusion length in organic materials. The long-range charge separation mechanism uncovered in this work, in cooperation with the short-range xCT-mediated pathway, holds the potential to further optimize OPVs with diverse device structures.
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Affiliation(s)
- Qian Li
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Rui Wang
- College of Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
- Key Laboratory of Aerospace Information Materials and Physics (NUAA), MIIT, Nanjing 211106, China
| | - Tao Yu
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Xiaoyong Wang
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Zhi-Guo Zhang
- State Key Laboratory of Organic/Inorganic Composites, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Yuan Zhang
- School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100191, China
| | - Min Xiao
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing 210093, China
- Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Chunfeng Zhang
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing 210093, China
- Institute of Materials Engineering, Nanjing University, Nantong, Jiangsu 226001, China
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3
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Marin-Beloqui JM, Congrave DG, Toolan DTW, Montanaro S, Guo J, Wright IA, Clarke TM, Bronstein H, Dimitrov SD. Generating Long-Lived Triplet Excited States in Narrow Bandgap Conjugated Polymers. J Am Chem Soc 2023; 145:3507-3514. [PMID: 36735862 PMCID: PMC9936540 DOI: 10.1021/jacs.2c12008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Narrow bandgap conjugated polymers are a heavily studied class of organic semiconductors, but their excited states usually have a very short lifetime, limiting their scope for applications. One approach to overcome the short lifetime is to populate long-lived triplet states for which relaxation to the ground state is forbidden. However, the triplet lifetime of narrow bandgap polymer films is typically limited to a few microseconds. Here, we investigated the effect of film morphology on triplet dynamics in red-emitting conjugated polymers based on the classic benzodithiophene monomer unit with the solubilizing alkyl side chains C16 and C2C6 and then used Pd porphyrin sensitization as a further strategy to change the triplet dynamics. Using transient absorption spectroscopy, we demonstrated a 0.45 ms triplet lifetime for the more crystalline nonsensitized polymer C2C6, 2-3 orders of magnitude longer than typically reported, while the amorphous C16 had only a 5 μs lifetime. The increase is partly due to delaying bimolecular electron-hole recombination in the more crystalline C2C6, where a higher energy barrier for charge recombination is expected. A triplet lifetime of 0.4 ms was also achieved by covalently incorporating 5% of Pd porphyrin into the C16 polymer, which introduced extra energy transfer steps between the polymer and porphyrin that delayed triplet dynamics and increased the polymer triplet yield by 7.9 times. This work demonstrates two synthetic approaches to generate the longest-lived triplet excited states in narrow bandgap conjugated polymers, which is of necessity in a wide range of fields that range from organic electronics to sensors and bioapplications.
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Affiliation(s)
- Jose M. Marin-Beloqui
- Department
of Chemistry, University College London, London WC1H 0AJ, U.K.,Department
of Physical-Chemistry, University of Málaga, Campus de Teatinos, Málaga, 29071 Málaga, Spain
| | - Daniel G. Congrave
- Department
of Chemistry, University of Cambridge, Cambridge CB2 1EW, U.K.
| | - Daniel T. W. Toolan
- Department
of Chemistry, Dainton Building, The University
of Sheffield, Brook Hill, Sheffield S3 7HF, U.K.
| | - Stephanie Montanaro
- Department
of Chemistry, Loughborough University, Loughborough LE11 3TU, U.K.
| | - Junjun Guo
- Department
of Chemistry, University College London, London WC1H 0AJ, U.K.
| | - Iain A. Wright
- Department
of Chemistry, Loughborough University, Loughborough LE11 3TU, U.K.,School of
Chemistry, University of Edinburgh, Edinburgh EH9 3FJ, U.K.
| | - Tracey M. Clarke
- Department
of Chemistry, University College London, London WC1H 0AJ, U.K.,
| | - Hugo Bronstein
- Department
of Chemistry, University of Cambridge, Cambridge CB2 1EW, U.K.,
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4
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Ran G, Su W, Lu H, Liu Y, Bo Z, Zhang W. Intrachain and Interchain Excited-State Dynamics of Temperature-Dependent Aggregation Copolymer in Solution. J Phys Chem B 2022; 126:7393-7399. [DOI: 10.1021/acs.jpcb.2c05156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Guangliu Ran
- Department of Physics and Applied Optics Beijing Area Major Laboratory, Center for Advanced Quantum Studies, Beijing Normal University, Beijing 100875, China
| | - Wenli Su
- Department of Physics and Applied Optics Beijing Area Major Laboratory, Center for Advanced Quantum Studies, Beijing Normal University, Beijing 100875, China
| | - Hao Lu
- College of Textiles & Clothing, State Key Laboratory of Bio-fibers and Eco-textiles, Qingdao University, Qingdao 266071, China
| | - Yahui Liu
- College of Textiles & Clothing, State Key Laboratory of Bio-fibers and Eco-textiles, Qingdao University, Qingdao 266071, China
| | - Zhishan Bo
- College of Textiles & Clothing, State Key Laboratory of Bio-fibers and Eco-textiles, Qingdao University, Qingdao 266071, China
| | - Wenkai Zhang
- Department of Physics and Applied Optics Beijing Area Major Laboratory, Center for Advanced Quantum Studies, Beijing Normal University, Beijing 100875, China
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5
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Zhao N, Zhang R, Zou X, Su X, Dang F, Wen G, Zhang W, Zheng K, Chen H, Wu K. Photoinduced Polaron Formation in a Polymerized Electron-Acceptor Semiconductor. J Phys Chem Lett 2022; 13:5143-5150. [PMID: 35658092 DOI: 10.1021/acs.jpclett.2c01015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Polymerized small molecular acceptor (PSMA) based all-polymer solar cells (all-PSC) have achieved power conversion efficiencies (PCE) over 16%, and the PSMA is considered to hold great promise for further improving the performance of all-PSC. Yet, in comparison with that of the polymer donor, the photophysics of a polymerized acceptor remains poorly understood. Herein, the excited state dynamics in a polymerized acceptor PZT810 was comprehensively investigated under various pump intensities and photon energies. The excess excitation energy was found to play a key role in excitons dissociation into free polarons for neat PSMA films, while free polarons cannot be generated from the polaron pairs in neat acceptor films. This work reveals an in-depth understanding of relaxation dynamics for PSMAs and that the underlying photophysical origin of PSMA can be mediated by excitation energies and intensities. These results would benefit the realization of the working mechanism for all-PSC and the designing of new PSMAs.
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Affiliation(s)
- Ningjiu Zhao
- Songshan Lake Materials Laboratory, Dongguan, 523808, China
| | - Rui Zhang
- Department of Physics, Chemsitry and Biology (IFM), Linköping University, Linköping, SE-58183, Sweden
| | - Xianshao Zou
- Division of Chemical Physics, Lund University, Lund, 22100, Sweden
| | - Xiaojun Su
- Department of Basic Courses, Guangzhou Maritime University, Guangzhou, 510725, China
| | - Fan Dang
- Songshan Lake Materials Laboratory, Dongguan, 523808, China
| | - Guanzhao Wen
- School of Physics and Materials Science, Guangzhou University, Guangzhou, 510006, China
| | - Wei Zhang
- School of Physics and Materials Science, Guangzhou University, Guangzhou, 510006, China
- Research Center for Advanced Information Materials (CAIM), Huangpu Research and Graduate School of Guangzhou University, Guangzhou, 510006, China
- Guangzhou University-Linköping University Research Center on Urban Sustainable Development, Guangzhou University, Guangzhou, 510006, China
| | - Kaibo Zheng
- Division of Chemical Physics, Lund University, Lund, 22100, Sweden
| | - Hailong Chen
- Songshan Lake Materials Laboratory, Dongguan, 523808, China
| | - Kehui Wu
- Songshan Lake Materials Laboratory, Dongguan, 523808, China
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6
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Jeon B, Kidanemariam A, Noh J, Hyun C, Mun HJ, Park K, Jung SJ, Jeon Y, Yoo PJ, Park J, Jung HT, Shin TJ, Park J. Strong Bathochromic Shift of Conjugated Polymer Nanowires Assembled with a Liquid Crystalline Alkyl Benzoic Acid via a Film Dispersion Process. ACS OMEGA 2021; 6:34876-34888. [PMID: 34963971 PMCID: PMC8697608 DOI: 10.1021/acsomega.1c05556] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Accepted: 11/26/2021] [Indexed: 06/14/2023]
Abstract
We present aqueous dispersions of conjugated polymer nanowires (CPNWs) with improved light absorption properties aimed at aqueous-based applications. We assembled films of a donor-acceptor-type conjugated polymer and liquid crystalline 4-n-octylbenzoic acid by removing a cosolvent of their mixture solutions, followed by annealing of the films, and then formed aqueous-dispersed CPNWs with an aspect ratio >1000 by dispersing the films under ultrasonication at a basic pH. X-ray and spectroscopy studies showed that the polymer and liquid crystal molecules form independent domains in film assemblies and highly organized layer structures in CPNWs. Our ordered molecular assemblies in films and aqueous dispersions of CPNWs open up a new route to fabricate nanowires of low-band-gap linear conjugated polymers with the absorption maximum at 794 nm remarkably red-shifted from 666 nm of CPNWs prepared by an emulsion process. Our results suggest the presence of semicrystalline polymorphs β1 and β2 phases in CPNWs due to long-range π-π stacking of conjugated backbones in compactly organized lamellar structures. The resulting delocalization with a reduced energy bang gap should be beneficial for enhancing charge transfer and energy-conversion efficiencies in aqueous-based applications such as photocatalysis.
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Affiliation(s)
- Byoung
Yun Jeon
- Department
of Intelligent Energy and Industry, School of Chemical Engineering
and Materials Science, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Alemayehu Kidanemariam
- Department
of Intelligent Energy and Industry, School of Chemical Engineering
and Materials Science, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Juran Noh
- Department
of Materials Science and Engineering, Texas
A&M University, College
Station, Texas 77843, United States
| | - Chohee Hyun
- UNIST
Central Research Facilities & School of Natural Science, Ulsan National Institute of Science and Technology
(UNIST), Ulsan 44919, Republic of Korea
| | - Hyun Jung Mun
- UNIST
Central Research Facilities & School of Natural Science, Ulsan National Institute of Science and Technology
(UNIST), Ulsan 44919, Republic of Korea
| | - Kangho Park
- Department
of Chemical and Biomolecular Engineering (BK-21 Plus) & KAIST
Institute for NanoCentury, Korea Advanced
Institute of Science and Technology, Daejeon 34141, Republic of Korea
| | - Seung-Jin Jung
- Department
of Chemistry and Nanoscience, Ewha Womans
University, Seoul 03760, Republic of Korea
| | - Yejee Jeon
- Department
of Intelligent Energy and Industry, School of Chemical Engineering
and Materials Science, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Pil J. Yoo
- School
of
Chemical Engineering, SKKU Advanced Institute of nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic
of Korea
| | - JaeHong Park
- Department
of Chemistry and Nanoscience, Ewha Womans
University, Seoul 03760, Republic of Korea
| | - Hee-Tae Jung
- Department
of Chemical and Biomolecular Engineering (BK-21 Plus) & KAIST
Institute for NanoCentury, Korea Advanced
Institute of Science and Technology, Daejeon 34141, Republic of Korea
| | - Tae Joo Shin
- UNIST
Central Research Facilities & School of Natural Science, Ulsan National Institute of Science and Technology
(UNIST), Ulsan 44919, Republic of Korea
| | - Juhyun Park
- Department
of Intelligent Energy and Industry, School of Chemical Engineering
and Materials Science, Chung-Ang University, Seoul 06974, Republic of Korea
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7
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Wang GD, Liu ZX, Qiu BB, Zhang ZG, Wang R, Wang XY, Ma J, Li YF, Xiao M, Zhang CF. Ultrafast electron transfer in all-small-molecule photovoltaic blends promoted by intermolecular interactions in cyanided donors. CHINESE J CHEM PHYS 2021. [DOI: 10.1063/1674-0068/cjcp2109179] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Affiliation(s)
- Guo-dong Wang
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Zhi-xing Liu
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Bei-bei Qiu
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Zhi-guo Zhang
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- State key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Rui Wang
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Xiao-yong Wang
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Jing Ma
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Yong-fang Li
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Min Xiao
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing 210093, China
- Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA
| | - Chun-feng Zhang
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing 210093, China
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8
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Wang K, Chen H, Li S, Zhang J, Zou Y, Yang Y. Interplay between Intrachain and Interchain Excited States in Donor-Acceptor Copolymers. J Phys Chem B 2021; 125:7470-7476. [PMID: 34219460 DOI: 10.1021/acs.jpcb.1c03989] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Recently, rapid progress in the power conversion efficiency for organic solar cells (OSCs) is achieved due to the phenomenal development of the nonfullerene electron acceptors. In addition to the pairing electron donors, conjugated donor-acceptor copolymers are another key player in the high-efficiency OSCs. Here, the temporal evolution of excited states in a typical copolymer, PM6, was traced by transient absorption spectroscopy. The spectroscopic result implies the formation of two kinetically correlated intrachain species, polaron excitons and intrachain polaron pairs. In the presence of the interchain interaction, these intrachain species quickly convert into interchain polaron pairs on a time scale of few picoseconds. Our findings reveal that the electron transfer mechanisms in PM6-based OSCs substantially depend on the PM6 environment in the bulk heterojunction blends.
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Affiliation(s)
- Kang Wang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Honggang Chen
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Shuangyuan Li
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Jinzhong Zhang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Yingping Zou
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Ye Yang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
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9
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Wang K, Chen H, Zhang J, Zou Y, Yang Y. Intrachain and Interchain Exciton-Exciton Annihilation in Donor-Acceptor Copolymers. J Phys Chem Lett 2021; 12:3928-3933. [PMID: 33872020 DOI: 10.1021/acs.jpclett.1c00369] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
PM6 is a donor-acceptor copolymer widely used in high-efficiency organic solar cells (OSC). Here, we report the observation of exciton-exciton annihilation (EEA) in both PM6 copolymer solution and film. We find that the EEA mechanisms are distinct in these two systems. In the PM6 solution, EEA occurs via the long-range dipole-dipole interaction between intrachain excitons, while in the PM6 film it takes place between the interchain polaron pairs (spatially indirect excitons) via the short-range Coulomb interaction. The quantum yield of free polaron formation in the film is also quantified, which indicates that EEA leads to extra interchain polaron-pair dissociation, accounting for the enhanced free polaron formation.
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Affiliation(s)
- Kang Wang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Honggang Chen
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Jinzhong Zhang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Yingping Zou
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Ye Yang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
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10
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Song Y, Liu X, Li Y, Nguyen HH, Duan R, Kubarych KJ, Forrest SR, Ogilvie JP. Mechanistic Study of Charge Separation in a Nonfullerene Organic Donor-Acceptor Blend Using Multispectral Multidimensional Spectroscopy. J Phys Chem Lett 2021; 12:3410-3416. [PMID: 33788566 DOI: 10.1021/acs.jpclett.1c00407] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Organic photovoltaics (OPVs) based on nonfullerene acceptors are now approaching commercially viable efficiencies. One key to their success is efficient charge separation with low potential loss at the donor-acceptor heterojunction. Due to the lack of spectroscopic probes, open questions remain about the mechanisms of charge separation. Here, we study charge separation of a model system composed of the donor, poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)-benzo[1,2-b:4,5-b']dithiophene))-alt-(5,5-(1',3'-di-2-thienyl-5',7'-bis(2-ethylhexyl)benzo[1',2'-c:4',5'-c']dithiophene-4,8-dione) (PBDB-T), and the nonfullerene acceptor, 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2',3'-d']-s-indaceno[1,2-b:5,6-b']dithiophene (ITIC), using multidimensional spectroscopy spanning the visible to the mid-infrared. We find that bound polaron pairs (BPPs) generated within ITIC domains play a dominant role in efficient hole transfer, transitioning to delocalized polarons within 100 fs. The weak electron-hole binding within the BPPs and the resulting polaron delocalization are key factors for efficient charge separation at nearly zero driving force. Our work provides useful insight into how to further improve the power conversion efficiency in OPVs.
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Affiliation(s)
- Yin Song
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Xiao Liu
- Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Yongxi Li
- Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Hoang Huy Nguyen
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Rong Duan
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Kevin J Kubarych
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Stephen R Forrest
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, United States
- Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109, United States
- Department of Material Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Jennifer P Ogilvie
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, United States
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11
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Wang R, Zhang C, Li Q, Zhang Z, Wang X, Xiao M. Charge Separation from an Intra-Moiety Intermediate State in the High-Performance PM6:Y6 Organic Photovoltaic Blend. J Am Chem Soc 2020; 142:12751-12759. [DOI: 10.1021/jacs.0c04890] [Citation(s) in RCA: 122] [Impact Index Per Article: 30.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Rui Wang
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Chunfeng Zhang
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Qian Li
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Zhiguo Zhang
- College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Xiaoyong Wang
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Min Xiao
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing 210093, China
- Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, United States
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12
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Park J. Functional Fibers, Composites and Textiles Utilizing Photothermal and Joule Heating. Polymers (Basel) 2020; 12:E189. [PMID: 31936785 PMCID: PMC7022820 DOI: 10.3390/polym12010189] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 12/11/2019] [Accepted: 01/06/2020] [Indexed: 02/07/2023] Open
Abstract
This review focuses on the mechanism of adjusting the thermal environment surrounding the human body via textiles. Recently highlighted technologies for thermal management are based on the photothermal conversion principle and Joule heating for wearable electronics. Recent innovations in this technology are described, with a focus on reports in the last three years and are categorized into three subjects: (1) thermal management technologies of a passive type using light irradiation of the outside environment (photothermal heating), (2) those of an active type employing external electrical circuits (Joule heating), and (3) biomimetic structures. Fibers and textiles from the design of fibers and textiles perspective are also discussed with suggestions for future directions to maximize thermal storage and to minimize heat loss.
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Affiliation(s)
- Juhyun Park
- School of Chemical Engineering and Materials Science, Institute of Energy-Converting Soft Materials, Chung-Ang University, Seoul 06974, Korea
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13
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Short contacts between chains enhancing luminescence quantum yields and carrier mobilities in conjugated copolymers. Nat Commun 2019; 10:2614. [PMID: 31197152 PMCID: PMC6565747 DOI: 10.1038/s41467-019-10277-y] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Accepted: 04/25/2019] [Indexed: 11/28/2022] Open
Abstract
Efficient conjugated polymer optoelectronic devices benefit from concomitantly high luminescence and high charge carrier mobility. This is difficult to achieve, as interchain interactions, which are needed to ensure efficient charge transport, tend also to reduce radiative recombination and lead to solid-state quenching effects. Many studies detail strategies for reducing these interactions to increase luminescence, or modifying chain packing motifs to improve percolation charge transport; however achieving these properties together has proved elusive. Here, we show that properly designed amorphous donor-alt-acceptor conjugated polymers can circumvent this problem; combining a tuneable energy gap, fast radiative recombination rates and luminescence quantum efficiencies >15% with high carrier mobilities exceeding 2.4 cm2/Vs. We use photoluminescence from exciton states pinned to close-crossing points to study the interplay between mobility and luminescence. These materials show promise towards realising advanced optoelectronic devices based on conjugated polymers, including electrically-driven polymer lasers. Designing conjugated polymers with high charge carrier mobility and fluorescence quantum efficiency, though attractive for optoelectronics, remains challenging. Here, the authors report a strategy for designing donor-acceptor copolymers whose optoelectronic properties exceed the state-of-the-art.
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14
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Ultrafast hole transfer mediated by polaron pairs in all-polymer photovoltaic blends. Nat Commun 2019; 10:398. [PMID: 30674887 PMCID: PMC6344565 DOI: 10.1038/s41467-019-08361-4] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2018] [Accepted: 01/08/2019] [Indexed: 11/24/2022] Open
Abstract
The charge separation yield at a bulk heterojunction sets the upper efficiency limit of an organic solar cell. Ultrafast charge transfer processes in polymer/fullerene blends have been intensively studied but much less is known about these processes in all-polymer systems. Here, we show that interfacial charge separation can occur through a polaron pair-derived hole transfer process in all-polymer photovoltaic blends, which is a fundamentally different mechanism compared to the exciton-dominated pathway in the polymer/fullerene blends. By utilizing ultrafast optical measurements, we have clearly identified an ultrafast hole transfer process with a lifetime of about 3 ps mediated by photo-excited polaron pairs which has a markedly high quantum efficiency of about 97%. Spectroscopic data show that excitons act as spectators during the efficient hole transfer process. Our findings suggest an alternative route to improve the efficiency of all-polymer solar devices by manipulating polaron pairs. All-polymer solar cells have shown high efficiencies but the ultrafast charge transfer processes are less known. Here Wang et al. show that polaron pairs play vital role facilitating the hole transfer, which is quite different from the exciton dominated pathway in polymer-fullerene blends.
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15
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Ordered assemblies of Fe3O4 and a donor-acceptor-type π-conjugated polymer in nanoparticles for enhanced photoacoustic and magnetic effects. POLYMER 2019. [DOI: 10.1016/j.polymer.2018.12.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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16
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Lee D, Sang JS, Yoo PJ, Shin TJ, Oh KW, Park J. Machine-Washable Smart Textiles with Photothermal and Antibacterial Activities from Nanocomposite Fibers of Conjugated Polymer Nanoparticles and Polyacrylonitrile. Polymers (Basel) 2018; 11:polym11010016. [PMID: 30960000 PMCID: PMC6402031 DOI: 10.3390/polym11010016] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 12/14/2018] [Accepted: 12/20/2018] [Indexed: 12/04/2022] Open
Abstract
Smart textiles based on conjugated polymers have been highlighted as promising fabrics that can intelligently respond to environmental stimuli based on the electrical properties of polymer semiconductors. However, there has been limited interest in the photothermal properties of conjugated polymers that can be applied to smart textiles. We prepared nanoparticles by assembling a conjugated polymer with a fatty acid via an emulsion process and nanocomposite fibers by distributing the conjugated polymer nanoparticles in a polyacrylonitrile matrix. We then fabricated the textiles using the fibers. The resulting fabrics based on nanocomposite fibers show a temperature increase to 50 °C in 10 min under white light irradiation because of efficient photothermal conversion by the conjugated polymer light harvester, while the temperature of a pristine polyacrylonitrile fabric increases to only 35 °C. In addition, excellent antimicrobial activity was confirmed by a 99.9% decrease in the populations of Staphylococcus aureus and Escherichia coli over 24 h because of the effect of the fatty acid in the nanocomposite films and fabrics. Furthermore, the fabric showed efficient durability after a laundry test, suggesting the usefulness of these smart textiles based on conjugated polymer nanoparticles for practical applications.
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Affiliation(s)
- Dabin Lee
- School of Chemical Engineering and Materials Science, Institute of Energy Converting Soft Materials, Chung-Ang University, Seoul 06974, Korea.
| | - Jeong Seon Sang
- Industry Academic-Cooperation Foundation, Chung-Ang University, Seoul 06974, Korea.
| | - Pil J Yoo
- School of Chemical Engineering and SKKU Advanced Institute of Nanotechnology (SAINT), Suwon 16419, Korea.
| | - Tae Joo Shin
- UNIST Central Research Facilities and School of Natural Science, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea.
| | - Kyung Wha Oh
- Department of Fashion Design, College of Art, Chung-Ang University, Seoul 06974, Korea.
| | - Juhyun Park
- School of Chemical Engineering and Materials Science, Institute of Energy Converting Soft Materials, Chung-Ang University, Seoul 06974, Korea.
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17
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Kahmann S, Fazzi D, Matt GJ, Thiel W, Loi MA, Brabec CJ. Polarons in Narrow Band Gap Polymers Probed over the Entire Infrared Range: A Joint Experimental and Theoretical Investigation. J Phys Chem Lett 2016; 7:4438-4444. [PMID: 27749079 DOI: 10.1021/acs.jpclett.6b02083] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We investigate the photoinduced absorption (PIA) spectra of the prototypical donor-acceptor polymer [2,6-(4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b']dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (C-PCPDTBT) and its silicon bridged variant Si-PCPDTBT over a spectral range from 0.07 to 1.5 eV. Comparison between time-dependent density functional theory simulations of the electronic and vibrational transitions of singlet excitons, triplet excitons, polarons, and bipolarons with the experimental results proves that the observed features are due to positive polarons delocalized on the polymer chains. We find that the more crystalline Si-bridged variant gives rise to a red-shift in the transition energies, especially in the mid-infrared (MIR) spectral range and furthermore observe that the pristine polymers' responses depend on the excitation energy. Blending with PCBM, on the other hand, leads to excitation-independent PIA spectra. By computing the response properties of molecular aggregates, we show that polarons are delocalized in not only the intra- but also the interchain direction, leading to intermolecular transitions which correspond well to experimental absorption features at the lowest energies.
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Affiliation(s)
- Simon Kahmann
- Institute for Materials in Electronics and Energy Technology (i-MEET), Friedrich-Alexander University Erlangen-Nuremberg , Martensstraße 7, D-91058 Erlangen, Germany
- Photophysics and OptoElectronics, Zernike Institute of Advanced Materials, Rijksuniversiteit Groningen , Nijenborgh 4 NL-9747 AG, Groningen, The Netherlands
| | - Daniele Fazzi
- Max-Planck-Institut für Kohlenforschung (MPI-KOFO), Kaiser-Wilhelm-Platz 1, D-45470 Mühlheim an der Ruhr, Germany
| | - Gebhard J Matt
- Institute for Materials in Electronics and Energy Technology (i-MEET), Friedrich-Alexander University Erlangen-Nuremberg , Martensstraße 7, D-91058 Erlangen, Germany
| | - Walter Thiel
- Max-Planck-Institut für Kohlenforschung (MPI-KOFO), Kaiser-Wilhelm-Platz 1, D-45470 Mühlheim an der Ruhr, Germany
| | - Maria A Loi
- Photophysics and OptoElectronics, Zernike Institute of Advanced Materials, Rijksuniversiteit Groningen , Nijenborgh 4 NL-9747 AG, Groningen, The Netherlands
| | - Christoph J Brabec
- Institute for Materials in Electronics and Energy Technology (i-MEET), Friedrich-Alexander University Erlangen-Nuremberg , Martensstraße 7, D-91058 Erlangen, Germany
- Bavarian Center for Applied Energy Research (ZAE-Bayern), Haberstraße 2a, 91058 Erlangen, Germany
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