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Influence of Blend Morphology and Energetics on Charge Separation and Recombination Dynamics in Organic Solar Cells Incorporating a Nonfullerene Acceptor

Hyojung Cha, Scot Wheeler, Sarah Holliday, Stoichko Dimitrov Orcid Logo, Andrew Wadsworth, Hyun Hwi Lee, Derya Baran, Iain McCulloch, James Durrant Orcid Logo

Advanced Functional Materials, Start page: 1704389

Swansea University Authors: Stoichko Dimitrov Orcid Logo, James Durrant Orcid Logo

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DOI (Published version): 10.1002/adfm.201704389

Abstract

Nonfullerene acceptors (NFAs) in blends with highly crystalline donor polymers have been shown to yield particularly high device voltage outputs, but typically more modest quantum yields for photocurrent generation as well as often lower fill factors (FF). In this study, we employ transient optical...

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Published in: Advanced Functional Materials
ISSN: 1616-301X
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa37337
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In this study, we employ transient optical and optoelectronic analysis to elucidate the factors determining device photocurrent and FF in blends of the highly crystalline donor polymer PffBT4T-2OD with the promising NFA FBR or the more widely studied fullerene acceptor PC71BM. Geminate recombination losses, as measured by ultrafast transient absorption spectroscopy, are observed to be significantly higher for PffBT4T-2OD:FBR blends. This is assigned to the smaller LUMO-LUMO offset of the PffBT4T-2OD:FBR blends relative to PffBT4T-2OD:PC71BM, resulting in the lower photocurrent generation efficiency obtained with FBR. Employing time delayed charge extraction measurements, these geminate recombination losses are observed to be field dependent, resulting in the lower FF observed with PffBT4T-2OD:FBR devices. These data therefore provide a detailed understanding of the impact of acceptor design, and particularly acceptor energetics, on organic solar cell performance. 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spelling 2019-04-25T15:49:04.9576992 v2 37337 2017-12-06 Influence of Blend Morphology and Energetics on Charge Separation and Recombination Dynamics in Organic Solar Cells Incorporating a Nonfullerene Acceptor 9fc26ec1b8655cd0d66f7196a924fe14 0000-0002-1564-7080 Stoichko Dimitrov Stoichko Dimitrov true false f3dd64bc260e5c07adfa916c27dbd58a 0000-0001-8353-7345 James Durrant James Durrant true false 2017-12-06 EEN Nonfullerene acceptors (NFAs) in blends with highly crystalline donor polymers have been shown to yield particularly high device voltage outputs, but typically more modest quantum yields for photocurrent generation as well as often lower fill factors (FF). In this study, we employ transient optical and optoelectronic analysis to elucidate the factors determining device photocurrent and FF in blends of the highly crystalline donor polymer PffBT4T-2OD with the promising NFA FBR or the more widely studied fullerene acceptor PC71BM. Geminate recombination losses, as measured by ultrafast transient absorption spectroscopy, are observed to be significantly higher for PffBT4T-2OD:FBR blends. This is assigned to the smaller LUMO-LUMO offset of the PffBT4T-2OD:FBR blends relative to PffBT4T-2OD:PC71BM, resulting in the lower photocurrent generation efficiency obtained with FBR. Employing time delayed charge extraction measurements, these geminate recombination losses are observed to be field dependent, resulting in the lower FF observed with PffBT4T-2OD:FBR devices. These data therefore provide a detailed understanding of the impact of acceptor design, and particularly acceptor energetics, on organic solar cell performance. Our study concludes with a discussion of the implications of these results for the design of NFAs in organic solar cells. Journal Article Advanced Functional Materials 1704389 1616-301X field-dependent generation; geminate recombination; nonfullerene acceptors; nongeminate recombination; organic solar cells 31 12 2017 2017-12-31 10.1002/adfm.201704389 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2019-04-25T15:49:04.9576992 2017-12-06T12:45:57.1090101 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Hyojung Cha 1 Scot Wheeler 2 Sarah Holliday 3 Stoichko Dimitrov 0000-0002-1564-7080 4 Andrew Wadsworth 5 Hyun Hwi Lee 6 Derya Baran 7 Iain McCulloch 8 James Durrant 0000-0001-8353-7345 9 0037337-07122017090145.pdf cha2017(2)v2.pdf 2017-12-07T09:01:45.1030000 Output 1128905 application/pdf Accepted Manuscript true 2018-11-27T00:00:00.0000000 true eng 0037337-07122017090216.pdf chasupportinginfo2017v2.pdf 2017-12-07T09:02:16.2900000 Output 1181656 application/pdf Accepted Manuscript true 2018-11-27T00:00:00.0000000 Supporting Information true eng
title Influence of Blend Morphology and Energetics on Charge Separation and Recombination Dynamics in Organic Solar Cells Incorporating a Nonfullerene Acceptor
spellingShingle Influence of Blend Morphology and Energetics on Charge Separation and Recombination Dynamics in Organic Solar Cells Incorporating a Nonfullerene Acceptor
Stoichko Dimitrov
James Durrant
title_short Influence of Blend Morphology and Energetics on Charge Separation and Recombination Dynamics in Organic Solar Cells Incorporating a Nonfullerene Acceptor
title_full Influence of Blend Morphology and Energetics on Charge Separation and Recombination Dynamics in Organic Solar Cells Incorporating a Nonfullerene Acceptor
title_fullStr Influence of Blend Morphology and Energetics on Charge Separation and Recombination Dynamics in Organic Solar Cells Incorporating a Nonfullerene Acceptor
title_full_unstemmed Influence of Blend Morphology and Energetics on Charge Separation and Recombination Dynamics in Organic Solar Cells Incorporating a Nonfullerene Acceptor
title_sort Influence of Blend Morphology and Energetics on Charge Separation and Recombination Dynamics in Organic Solar Cells Incorporating a Nonfullerene Acceptor
author_id_str_mv 9fc26ec1b8655cd0d66f7196a924fe14
f3dd64bc260e5c07adfa916c27dbd58a
author_id_fullname_str_mv 9fc26ec1b8655cd0d66f7196a924fe14_***_Stoichko Dimitrov
f3dd64bc260e5c07adfa916c27dbd58a_***_James Durrant
author Stoichko Dimitrov
James Durrant
author2 Hyojung Cha
Scot Wheeler
Sarah Holliday
Stoichko Dimitrov
Andrew Wadsworth
Hyun Hwi Lee
Derya Baran
Iain McCulloch
James Durrant
format Journal article
container_title Advanced Functional Materials
container_start_page 1704389
publishDate 2017
institution Swansea University
issn 1616-301X
doi_str_mv 10.1002/adfm.201704389
college_str Faculty of Science and Engineering
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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 1
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description Nonfullerene acceptors (NFAs) in blends with highly crystalline donor polymers have been shown to yield particularly high device voltage outputs, but typically more modest quantum yields for photocurrent generation as well as often lower fill factors (FF). In this study, we employ transient optical and optoelectronic analysis to elucidate the factors determining device photocurrent and FF in blends of the highly crystalline donor polymer PffBT4T-2OD with the promising NFA FBR or the more widely studied fullerene acceptor PC71BM. Geminate recombination losses, as measured by ultrafast transient absorption spectroscopy, are observed to be significantly higher for PffBT4T-2OD:FBR blends. This is assigned to the smaller LUMO-LUMO offset of the PffBT4T-2OD:FBR blends relative to PffBT4T-2OD:PC71BM, resulting in the lower photocurrent generation efficiency obtained with FBR. Employing time delayed charge extraction measurements, these geminate recombination losses are observed to be field dependent, resulting in the lower FF observed with PffBT4T-2OD:FBR devices. These data therefore provide a detailed understanding of the impact of acceptor design, and particularly acceptor energetics, on organic solar cell performance. Our study concludes with a discussion of the implications of these results for the design of NFAs in organic solar cells.
published_date 2017-12-31T03:47:00Z
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score 11.013731

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