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Tail state limited photocurrent collection of thick photoactive layers in organic solar cells

Jiaying Wu, Joel Luke, Harrison Ka Hin Lee, Pabitra Shakya Tuladhar, Hyojung Cha, Soo-Young Jang, Wing Chung Tsoi Orcid Logo, Martin Heeney, Hongkyu Kang, Kwanghee Lee, Thomas Kirchartz, Ji-Seon Kim, James Durrant Orcid Logo

Nature Communications, Volume: 10, Issue: 1

Swansea University Authors: Wing Chung Tsoi Orcid Logo, James Durrant Orcid Logo

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DOI (Published version): 10.1038/s41467-019-12951-7

Abstract

We analyse organic solar cells with four different photoactive blends exhibiting differing dependencies of short-circuit current upon photoactive layer thickness. These blends and devices are analysed by transient optoelectronic techniques of carrier kinetics and densities, air photoemission spectro...

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Published in: Nature Communications
ISSN: 2041-1723 2041-1723
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa52866
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spelling 2021-01-15T10:35:37.9658406 v2 52866 2019-11-25 Tail state limited photocurrent collection of thick photoactive layers in organic solar cells 7e5f541df6635a9a8e1a579ff2de5d56 0000-0003-3836-5139 Wing Chung Tsoi Wing Chung Tsoi true false f3dd64bc260e5c07adfa916c27dbd58a 0000-0001-8353-7345 James Durrant James Durrant true false 2019-11-25 EAAS We analyse organic solar cells with four different photoactive blends exhibiting differing dependencies of short-circuit current upon photoactive layer thickness. These blends and devices are analysed by transient optoelectronic techniques of carrier kinetics and densities, air photoemission spectroscopy of material energetics, Kelvin probe measurements of work function, Mott-Schottky analyses of apparent doping density and by device modelling. We conclude that, for the device series studied, the photocurrent loss with thick active layers is primarily associated with the accumulation of photo-generated charge carriers in intra-bandgap tail states. This charge accumulation screens the device internal electrical field, preventing efficient charge collection. Purification of one studied donor polymer is observed to reduce tail state distribution and density and increase the maximal photoactive thickness for efficient operation. Our work suggests that selecting organic photoactive layers with a narrow distribution of tail states is a key requirement for the fabrication of efficient, high photocurrent, thick organic solar cells. Journal Article Nature Communications 10 1 2041-1723 2041-1723 1 12 2019 2019-12-01 10.1038/s41467-019-12951-7 http://dx.doi.org/10.1038/s41467-019-12951-7 COLLEGE NANME Engineering and Applied Sciences School COLLEGE CODE EAAS Swansea University 2021-01-15T10:35:37.9658406 2019-11-25T11:50:17.3224792 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Jiaying Wu 1 Joel Luke 2 Harrison Ka Hin Lee 3 Pabitra Shakya Tuladhar 4 Hyojung Cha 5 Soo-Young Jang 6 Wing Chung Tsoi 0000-0003-3836-5139 7 Martin Heeney 8 Hongkyu Kang 9 Kwanghee Lee 10 Thomas Kirchartz 11 Ji-Seon Kim 12 James Durrant 0000-0001-8353-7345 13 52866__15952__aafa39aa4e8249f3819c5197bc21ffa7.pdf wu2019(3).pdf 2019-11-25T11:52:18.5356258 Output 873331 application/pdf Version of Record true 2019-11-25T00:00:00.0000000 false This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
title Tail state limited photocurrent collection of thick photoactive layers in organic solar cells
spellingShingle Tail state limited photocurrent collection of thick photoactive layers in organic solar cells
Wing Chung Tsoi
James Durrant
title_short Tail state limited photocurrent collection of thick photoactive layers in organic solar cells
title_full Tail state limited photocurrent collection of thick photoactive layers in organic solar cells
title_fullStr Tail state limited photocurrent collection of thick photoactive layers in organic solar cells
title_full_unstemmed Tail state limited photocurrent collection of thick photoactive layers in organic solar cells
title_sort Tail state limited photocurrent collection of thick photoactive layers in organic solar cells
author_id_str_mv 7e5f541df6635a9a8e1a579ff2de5d56
f3dd64bc260e5c07adfa916c27dbd58a
author_id_fullname_str_mv 7e5f541df6635a9a8e1a579ff2de5d56_***_Wing Chung Tsoi
f3dd64bc260e5c07adfa916c27dbd58a_***_James Durrant
author Wing Chung Tsoi
James Durrant
author2 Jiaying Wu
Joel Luke
Harrison Ka Hin Lee
Pabitra Shakya Tuladhar
Hyojung Cha
Soo-Young Jang
Wing Chung Tsoi
Martin Heeney
Hongkyu Kang
Kwanghee Lee
Thomas Kirchartz
Ji-Seon Kim
James Durrant
format Journal article
container_title Nature Communications
container_volume 10
container_issue 1
publishDate 2019
institution Swansea University
issn 2041-1723
2041-1723
doi_str_mv 10.1038/s41467-019-12951-7
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
url http://dx.doi.org/10.1038/s41467-019-12951-7
document_store_str 1
active_str 0
description We analyse organic solar cells with four different photoactive blends exhibiting differing dependencies of short-circuit current upon photoactive layer thickness. These blends and devices are analysed by transient optoelectronic techniques of carrier kinetics and densities, air photoemission spectroscopy of material energetics, Kelvin probe measurements of work function, Mott-Schottky analyses of apparent doping density and by device modelling. We conclude that, for the device series studied, the photocurrent loss with thick active layers is primarily associated with the accumulation of photo-generated charge carriers in intra-bandgap tail states. This charge accumulation screens the device internal electrical field, preventing efficient charge collection. Purification of one studied donor polymer is observed to reduce tail state distribution and density and increase the maximal photoactive thickness for efficient operation. Our work suggests that selecting organic photoactive layers with a narrow distribution of tail states is a key requirement for the fabrication of efficient, high photocurrent, thick organic solar cells.
published_date 2019-12-01T07:50:44Z
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