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Correlating Charge-Transfer State Lifetimes with Material Energetics in Polymer:Non-Fullerene Acceptor Organic Solar Cells

Yifan Dong, Hyojung Cha, Helen L. Bristow, Jinho Lee, Aditi Kumar, Pabitra Shakya Tuladhar, Iain McCulloch, Artem A. Bakulin, James Durrant Orcid Logo

Journal of the American Chemical Society, Volume: 143, Issue: 20, Pages: 7599 - 7603

Swansea University Author: James Durrant Orcid Logo

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DOI (Published version): 10.1021/jacs.1c00584

Abstract

Minimizing the energy offset between the lowest exciton and charge-transfer (CT) states is a widely employed strategy to suppress the energy loss (Eg/q – VOC) in polymer:non-fullerene acceptor (NFA) organic solar cells (OSCs). In this work, transient absorption spectroscopy is employed to determine...

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Published in: Journal of the American Chemical Society
ISSN: 0002-7863 1520-5126
Published: American Chemical Society (ACS) 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa57798
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first_indexed 2021-09-07T11:17:07Z
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spelling 2021-09-07T12:18:07.8444582 v2 57798 2021-09-07 Correlating Charge-Transfer State Lifetimes with Material Energetics in Polymer:Non-Fullerene Acceptor Organic Solar Cells f3dd64bc260e5c07adfa916c27dbd58a 0000-0001-8353-7345 James Durrant James Durrant true false 2021-09-07 MTLS Minimizing the energy offset between the lowest exciton and charge-transfer (CT) states is a widely employed strategy to suppress the energy loss (Eg/q – VOC) in polymer:non-fullerene acceptor (NFA) organic solar cells (OSCs). In this work, transient absorption spectroscopy is employed to determine CT state lifetimes in a series of low energy loss polymer:NFA blends. The CT state lifetime is observed to show an inverse energy gap law dependence and decreases as the energy loss is reduced. This behavior is assigned to increased mixing/hybridization between these CT states and shorter-lived singlet excitons of the lower gap component as the energy offset ΔECT-S1 is reduced. This study highlights how achieving longer exciton and CT state lifetimes has the potential for further enhancement of OSC efficiencies. Journal Article Journal of the American Chemical Society 143 20 7599 7603 American Chemical Society (ACS) 0002-7863 1520-5126 Colloid and Surface Chemistry, Biochemistry, General Chemistry, Catalysis 26 5 2021 2021-05-26 10.1021/jacs.1c00584 Accepted version available at https://spiral.imperial.ac.uk/handle/10044/1/89379 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University Engineering and Physical Sciences Research Council Grant: EP/T026219/1 Grant: EP/TO28513/1 Identifier: FundRef 10.13039/501100000266 UK Research and Innovation Grant: EP/P032591/1 Identifier: FundRef 10.13039/100014013 King Abdullah University of Science and Technology Grant: OSR-2015-CRG4-2572 Grant: OSR-2018-CRG/CCF-3079 Grant: OSR-2018-CRG7-3749 Grant: OSR-2018-CRG7-3749.2 Grant: OSR-2019-CRG8-4086 Identifier: FundRef 10.13039/501100004052 H2020 European Research Council Grant: n?862474 Grant: n?952911 Identifier: FundRef 10.13039/100010663 2021-09-07T12:18:07.8444582 2021-09-07T12:14:11.7142500 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Yifan Dong 1 Hyojung Cha 2 Helen L. Bristow 3 Jinho Lee 4 Aditi Kumar 5 Pabitra Shakya Tuladhar 6 Iain McCulloch 7 Artem A. Bakulin 8 James Durrant 0000-0001-8353-7345 9
title Correlating Charge-Transfer State Lifetimes with Material Energetics in Polymer:Non-Fullerene Acceptor Organic Solar Cells
spellingShingle Correlating Charge-Transfer State Lifetimes with Material Energetics in Polymer:Non-Fullerene Acceptor Organic Solar Cells
James Durrant
title_short Correlating Charge-Transfer State Lifetimes with Material Energetics in Polymer:Non-Fullerene Acceptor Organic Solar Cells
title_full Correlating Charge-Transfer State Lifetimes with Material Energetics in Polymer:Non-Fullerene Acceptor Organic Solar Cells
title_fullStr Correlating Charge-Transfer State Lifetimes with Material Energetics in Polymer:Non-Fullerene Acceptor Organic Solar Cells
title_full_unstemmed Correlating Charge-Transfer State Lifetimes with Material Energetics in Polymer:Non-Fullerene Acceptor Organic Solar Cells
title_sort Correlating Charge-Transfer State Lifetimes with Material Energetics in Polymer:Non-Fullerene Acceptor Organic Solar Cells
author_id_str_mv f3dd64bc260e5c07adfa916c27dbd58a
author_id_fullname_str_mv f3dd64bc260e5c07adfa916c27dbd58a_***_James Durrant
author James Durrant
author2 Yifan Dong
Hyojung Cha
Helen L. Bristow
Jinho Lee
Aditi Kumar
Pabitra Shakya Tuladhar
Iain McCulloch
Artem A. Bakulin
James Durrant
format Journal article
container_title Journal of the American Chemical Society
container_volume 143
container_issue 20
container_start_page 7599
publishDate 2021
institution Swansea University
issn 0002-7863
1520-5126
doi_str_mv 10.1021/jacs.1c00584
publisher American Chemical Society (ACS)
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 Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 0
active_str 0
description Minimizing the energy offset between the lowest exciton and charge-transfer (CT) states is a widely employed strategy to suppress the energy loss (Eg/q – VOC) in polymer:non-fullerene acceptor (NFA) organic solar cells (OSCs). In this work, transient absorption spectroscopy is employed to determine CT state lifetimes in a series of low energy loss polymer:NFA blends. The CT state lifetime is observed to show an inverse energy gap law dependence and decreases as the energy loss is reduced. This behavior is assigned to increased mixing/hybridization between these CT states and shorter-lived singlet excitons of the lower gap component as the energy offset ΔECT-S1 is reduced. This study highlights how achieving longer exciton and CT state lifetimes has the potential for further enhancement of OSC efficiencies.
published_date 2021-05-26T04:13:48Z
_version_ 1763753935569420288
score 11.012678

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