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Efficient Nanoscale Exciton Transport in Non‐Fullerene Organic Solar Cells Enables Reduced Bimolecular Recombination of Free Charges

Drew Riley, Oskar Sandberg Orcid Logo, Nasim Zarrabi, Yong Kim, Paul Meredith Orcid Logo, Ardalan Armin Orcid Logo

Advanced Materials, Volume: 35, Issue: 24

Swansea University Authors: Drew Riley, Oskar Sandberg Orcid Logo, Nasim Zarrabi, Yong Kim, Paul Meredith Orcid Logo, Ardalan Armin Orcid Logo

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DOI (Published version): 10.1002/adma.202211174

Abstract

The highest-efficiency organic photovoltaic (OPV)-based solar cells, made from blends of electron-donating and electron-accepting organic semiconductors, are often characterized by strongly reduced (non-Langevin) bimolecular recombination. Although the origins of the reduced recombination are debate...

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Published in: Advanced Materials
ISSN: 0935-9648 1521-4095
Published: Wiley 2023
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URI: https://cronfa.swan.ac.uk/Record/cronfa63793
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Although the origins of the reduced recombination are debated, mechanisms related to the charge-transfer (CT) state and free-carrier encounter dynamics controlled by the size of donor and acceptor domains are proposed as underlying factors. Here, a novel photoluminescence-based probe is reported to accurately quantify the donor–acceptor domain size in OPV blends. Specifically, the domain size is measured in high-efficiency non-fullerene acceptor (NFA) systems and a comparative conventional fullerene system. It is found that the NFA-based blends form larger domains but that the expected reductions in bimolecular recombination attributed to the enhanced domain sizes are too small to account for the observed reduction factors. Further, it is shown that the reduction of bimolecular recombination is correlated to enhanced exciton dynamics within the NFA domains. 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spelling v2 63793 2023-07-06 Efficient Nanoscale Exciton Transport in Non‐Fullerene Organic Solar Cells Enables Reduced Bimolecular Recombination of Free Charges edca1c48f922393fa2b3cb84d8dc0e4a Drew Riley Drew Riley true false 9e91512a54d5aee66cd77851a96ba747 0000-0003-3778-8746 Oskar Sandberg Oskar Sandberg true false d20976a5892074dae0368a4bb4433f76 Nasim Zarrabi Nasim Zarrabi true false 512fd36e6c36e8ae0fd6f89851eee891 Yong Kim Yong Kim true false 31e8fe57fa180d418afd48c3af280c2e 0000-0002-9049-7414 Paul Meredith Paul Meredith true false 22b270622d739d81e131bec7a819e2fd 0000-0002-6129-5354 Ardalan Armin Ardalan Armin true false 2023-07-06 SPH The highest-efficiency organic photovoltaic (OPV)-based solar cells, made from blends of electron-donating and electron-accepting organic semiconductors, are often characterized by strongly reduced (non-Langevin) bimolecular recombination. Although the origins of the reduced recombination are debated, mechanisms related to the charge-transfer (CT) state and free-carrier encounter dynamics controlled by the size of donor and acceptor domains are proposed as underlying factors. Here, a novel photoluminescence-based probe is reported to accurately quantify the donor–acceptor domain size in OPV blends. Specifically, the domain size is measured in high-efficiency non-fullerene acceptor (NFA) systems and a comparative conventional fullerene system. It is found that the NFA-based blends form larger domains but that the expected reductions in bimolecular recombination attributed to the enhanced domain sizes are too small to account for the observed reduction factors. Further, it is shown that the reduction of bimolecular recombination is correlated to enhanced exciton dynamics within the NFA domains. This indicates that the processes responsible for efficient exciton transport also enable strongly non-Langevin recombination in high-efficiency NFA-based solar cells with low-energy offsets. Journal Article Advanced Materials 35 24 Wiley 0935-9648 1521-4095 Bimolecular recombination, domain size, exciton diffusion, organic solar cells, organic photovoltaics 30 6 2023 2023-06-30 10.1002/adma.202211174 http://dx.doi.org/10.1002/adma.202211174 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University SU Library paid the OA fee (TA Institutional Deal) Swansea University. This work was supported by the Welsh Government's Sêr Cymru II Program through the European Regional Development Fund, Welsh European Funding Office, and the Swansea University strategic initiative in Sustainable Advanced Materials. A.A. is a Sêr Cymru II Rising Star Fellow, and P.M. is a Sêr Cymru II National Research Chair. This work was also funded by UKRI through the EPSRC Program Grant EP/T028513/1 Application Targeted Integrated Photovoltaics. D.B.R. acknowledges the support of the Natural Sciences and Engineering Research Council of Canada (NSERC) (Grant No. PGSD3-545694-2020]). 2023-08-16T11:36:20.0920265 2023-07-06T16:13:59.9153863 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Drew Riley 1 Oskar Sandberg 0000-0003-3778-8746 2 Nasim Zarrabi 3 Yong Kim 4 Paul Meredith 0000-0002-9049-7414 5 Ardalan Armin 0000-0002-6129-5354 6 63793__28051__deb32401a7cc41cfad69d7d97839e4ac.pdf 63793.VOR.pdf 2023-07-06T16:17:38.5355704 Output 1540051 application/pdf Version of Record true © 2023 The Authors. Advanced Materials published by Wiley-VCH GmbH. Distributed under the terms of a Creative Commons Attribution 4.0 License (CC BY 4.0). true eng https://creativecommons.org/licenses/by/4.0/
title Efficient Nanoscale Exciton Transport in Non‐Fullerene Organic Solar Cells Enables Reduced Bimolecular Recombination of Free Charges
spellingShingle Efficient Nanoscale Exciton Transport in Non‐Fullerene Organic Solar Cells Enables Reduced Bimolecular Recombination of Free Charges
Drew Riley
Oskar Sandberg
Nasim Zarrabi
Yong Kim
Paul Meredith
Ardalan Armin
title_short Efficient Nanoscale Exciton Transport in Non‐Fullerene Organic Solar Cells Enables Reduced Bimolecular Recombination of Free Charges
title_full Efficient Nanoscale Exciton Transport in Non‐Fullerene Organic Solar Cells Enables Reduced Bimolecular Recombination of Free Charges
title_fullStr Efficient Nanoscale Exciton Transport in Non‐Fullerene Organic Solar Cells Enables Reduced Bimolecular Recombination of Free Charges
title_full_unstemmed Efficient Nanoscale Exciton Transport in Non‐Fullerene Organic Solar Cells Enables Reduced Bimolecular Recombination of Free Charges
title_sort Efficient Nanoscale Exciton Transport in Non‐Fullerene Organic Solar Cells Enables Reduced Bimolecular Recombination of Free Charges
author_id_str_mv edca1c48f922393fa2b3cb84d8dc0e4a
9e91512a54d5aee66cd77851a96ba747
d20976a5892074dae0368a4bb4433f76
512fd36e6c36e8ae0fd6f89851eee891
31e8fe57fa180d418afd48c3af280c2e
22b270622d739d81e131bec7a819e2fd
author_id_fullname_str_mv edca1c48f922393fa2b3cb84d8dc0e4a_***_Drew Riley
9e91512a54d5aee66cd77851a96ba747_***_Oskar Sandberg
d20976a5892074dae0368a4bb4433f76_***_Nasim Zarrabi
512fd36e6c36e8ae0fd6f89851eee891_***_Yong Kim
31e8fe57fa180d418afd48c3af280c2e_***_Paul Meredith
22b270622d739d81e131bec7a819e2fd_***_Ardalan Armin
author Drew Riley
Oskar Sandberg
Nasim Zarrabi
Yong Kim
Paul Meredith
Ardalan Armin
author2 Drew Riley
Oskar Sandberg
Nasim Zarrabi
Yong Kim
Paul Meredith
Ardalan Armin
format Journal article
container_title Advanced Materials
container_volume 35
container_issue 24
publishDate 2023
institution Swansea University
issn 0935-9648
1521-4095
doi_str_mv 10.1002/adma.202211174
publisher Wiley
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
url http://dx.doi.org/10.1002/adma.202211174
document_store_str 1
active_str 0
description The highest-efficiency organic photovoltaic (OPV)-based solar cells, made from blends of electron-donating and electron-accepting organic semiconductors, are often characterized by strongly reduced (non-Langevin) bimolecular recombination. Although the origins of the reduced recombination are debated, mechanisms related to the charge-transfer (CT) state and free-carrier encounter dynamics controlled by the size of donor and acceptor domains are proposed as underlying factors. Here, a novel photoluminescence-based probe is reported to accurately quantify the donor–acceptor domain size in OPV blends. Specifically, the domain size is measured in high-efficiency non-fullerene acceptor (NFA) systems and a comparative conventional fullerene system. It is found that the NFA-based blends form larger domains but that the expected reductions in bimolecular recombination attributed to the enhanced domain sizes are too small to account for the observed reduction factors. Further, it is shown that the reduction of bimolecular recombination is correlated to enhanced exciton dynamics within the NFA domains. This indicates that the processes responsible for efficient exciton transport also enable strongly non-Langevin recombination in high-efficiency NFA-based solar cells with low-energy offsets.
published_date 2023-06-30T11:36:20Z
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score 11.016235

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