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Exceptionally low charge trapping enables highly efficient organic bulk heterojunction solar cells

Jiaying Wu, Jinho Lee, Yi-Chun Chin, Huifeng Yao, Hyojung Cha, Joel Luke, Jianhui Hou, Ji-Seon Kim

Energy & Environmental Science, Volume: 13, Issue: 8, Pages: 2422 - 2430

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DOI (Published version): 10.1039/d0ee01338b

Abstract

In this study, we investigate the underlying origin of the high performance of PM6:Y6 organic solar cells. Employing transient optoelectronic and photoemission spectroscopies, we find that this blend exhibits greatly suppressed charge trapping into electronic intra-bandgap tail states compared to ot...

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Published in: Energy & Environmental Science
ISSN: 1754-5692 1754-5706
Published: Royal Society of Chemistry (RSC) 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa55035
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spelling 2022-05-09T15:52:23.8613509 v2 55035 2020-08-20 Exceptionally low charge trapping enables highly efficient organic bulk heterojunction solar cells 2020-08-20 In this study, we investigate the underlying origin of the high performance of PM6:Y6 organic solar cells. Employing transient optoelectronic and photoemission spectroscopies, we find that this blend exhibits greatly suppressed charge trapping into electronic intra-bandgap tail states compared to other polymer/non-fullerene acceptor solar cells, attributed to lower energetic disorder. The presence of tail states is a key source of energetic loss in most organic solar cells, as charge carriers relax into these states, reducing the quasi-Fermi level splitting and therefore device VOC. DFT and Raman analyses indicate this suppression of tail state energetics disorder could be associated with a higher degree of conformational rigidity and uniformity for the Y6 acceptor. We attribute the origin of such conformational rigidity and uniformity of Y6 to the presence of the two alkyl side chains on the outer core that restricts end-group rotation by acting as a conformation locker. The resultant enhanced carrier dynamics and suppressed charge carrier trapping are proposed to be a key factor behind the high performance of this blend. Low energetic disorder is suggested to be a key factor enabling reasonably efficient charge generation in this low energy offset system. In the absence of either energetic disorder or a significant electronic energy offset, it is argued that charge separation in this system is primarily entropy driven. Nevertheless, photocurrent generation is still limited by slow hole transfer from Y6 to PM6, suggesting pathways for further efficiency improvement. Journal Article Energy & Environmental Science 13 8 2422 2430 Royal Society of Chemistry (RSC) 1754-5692 1754-5706 1 8 2020 2020-08-01 10.1039/d0ee01338b http://dx.doi.org/10.1039/d0ee01338b COLLEGE NANME COLLEGE CODE Swansea University 2022-05-09T15:52:23.8613509 2020-08-20T11:46:11.9329795 College of Engineering Engineering Jiaying Wu 1 Jinho Lee 2 Yi-Chun Chin 3 Huifeng Yao 4 Hyojung Cha 5 Joel Luke 6 Jianhui Hou 7 Ji-Seon Kim 8 55035__17999__d427a3b702bd4e46ad96b19cccf9910e.pdf 55035.pdf 2020-08-20T11:47:57.8728851 Output 3384505 application/pdf Version of Record true This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. false
title Exceptionally low charge trapping enables highly efficient organic bulk heterojunction solar cells
spellingShingle Exceptionally low charge trapping enables highly efficient organic bulk heterojunction solar cells
,
title_short Exceptionally low charge trapping enables highly efficient organic bulk heterojunction solar cells
title_full Exceptionally low charge trapping enables highly efficient organic bulk heterojunction solar cells
title_fullStr Exceptionally low charge trapping enables highly efficient organic bulk heterojunction solar cells
title_full_unstemmed Exceptionally low charge trapping enables highly efficient organic bulk heterojunction solar cells
title_sort Exceptionally low charge trapping enables highly efficient organic bulk heterojunction solar cells
author ,
author2 Jiaying Wu
Jinho Lee
Yi-Chun Chin
Huifeng Yao
Hyojung Cha
Joel Luke
Jianhui Hou
Ji-Seon Kim
format Journal article
container_title Energy & Environmental Science
container_volume 13
container_issue 8
container_start_page 2422
publishDate 2020
institution Swansea University
issn 1754-5692
1754-5706
doi_str_mv 10.1039/d0ee01338b
publisher Royal Society of Chemistry (RSC)
college_str College of Engineering
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hierarchy_top_id collegeofengineering
hierarchy_top_title College of Engineering
hierarchy_parent_id collegeofengineering
hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
url http://dx.doi.org/10.1039/d0ee01338b
document_store_str 1
active_str 0
description In this study, we investigate the underlying origin of the high performance of PM6:Y6 organic solar cells. Employing transient optoelectronic and photoemission spectroscopies, we find that this blend exhibits greatly suppressed charge trapping into electronic intra-bandgap tail states compared to other polymer/non-fullerene acceptor solar cells, attributed to lower energetic disorder. The presence of tail states is a key source of energetic loss in most organic solar cells, as charge carriers relax into these states, reducing the quasi-Fermi level splitting and therefore device VOC. DFT and Raman analyses indicate this suppression of tail state energetics disorder could be associated with a higher degree of conformational rigidity and uniformity for the Y6 acceptor. We attribute the origin of such conformational rigidity and uniformity of Y6 to the presence of the two alkyl side chains on the outer core that restricts end-group rotation by acting as a conformation locker. The resultant enhanced carrier dynamics and suppressed charge carrier trapping are proposed to be a key factor behind the high performance of this blend. Low energetic disorder is suggested to be a key factor enabling reasonably efficient charge generation in this low energy offset system. In the absence of either energetic disorder or a significant electronic energy offset, it is argued that charge separation in this system is primarily entropy driven. Nevertheless, photocurrent generation is still limited by slow hole transfer from Y6 to PM6, suggesting pathways for further efficiency improvement.
published_date 2020-08-01T04:26:14Z
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