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Towards optimisation of photocurrent from fullerene excitons in organic solar cells

Stoichko Dimitrov Orcid Logo, Zhenggang Huang, Florent Deledalle, Christian B. Nielsen, Bob C. Schroeder, Raja Shahid Ashraf, Safa Shoaee, Iain McCulloch, James R. Durrant

Energy & Environmental Science, Volume: 7, Issue: 3, Start page: 1037

Swansea University Author: Stoichko Dimitrov Orcid Logo

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DOI (Published version): 10.1039/c3ee42607f

Abstract

Photocurrent from fullerene excitons in polymer–fullerene solar cells is optimised by employing a series of low bandgap diketopyrrolopyrrole-containing polymers with differing molecular weights. The low LUMO level of this donor polymer prevents efficient charge generation from polymer excitons, allo...

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Published in: Energy & Environmental Science
ISSN: 1754-5692 1754-5706
Published: 2014
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URI: https://cronfa.swan.ac.uk/Record/cronfa31802
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spelling 2017-02-21T12:57:32.1982457 v2 31802 2017-01-27 Towards optimisation of photocurrent from fullerene excitons in organic solar cells 9fc26ec1b8655cd0d66f7196a924fe14 0000-0002-1564-7080 Stoichko Dimitrov Stoichko Dimitrov true false 2017-01-27 EEN Photocurrent from fullerene excitons in polymer–fullerene solar cells is optimised by employing a series of low bandgap diketopyrrolopyrrole-containing polymers with differing molecular weights. The low LUMO level of this donor polymer prevents efficient charge generation from polymer excitons, allowing us to focus on charge and photocurrent generation specifically from fullerene excitons. We employ femtosecond transient absorption spectroscopy and transmission electron microscopy to show a correlation between fullerene domain size and the kinetics of polaron generation from fullerene excitons, and relate these observations to device efficiency. Charge generation from fullerene excitons is shown to occur on the 0.5 ns timescale, limited by the kinetics of diffusion of fullerene excitons to domain interfaces with donor polymers. For devices employing the highest molecular weight donor polymer, ∼7 mA cm−2 of photocurrent is observed from fullerene excitons, leading to an overall device efficiency of 5.2%. Journal Article Energy & Environmental Science 7 3 1037 1754-5692 1754-5706 31 12 2014 2014-12-31 10.1039/c3ee42607f http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&amp;SrcAuth=ORCID&amp;SrcApp=OrcidOrg&amp;DestLinkType=FullRecord&amp;DestApp=WOS_CPL&amp;KeyUT=WOS:000333203900021&amp;KeyUID=WOS:000333203900021 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2017-02-21T12:57:32.1982457 2017-01-27T13:46:08.4605181 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Stoichko Dimitrov 0000-0002-1564-7080 1 Zhenggang Huang 2 Florent Deledalle 3 Christian B. Nielsen 4 Bob C. Schroeder 5 Raja Shahid Ashraf 6 Safa Shoaee 7 Iain McCulloch 8 James R. Durrant 9
title Towards optimisation of photocurrent from fullerene excitons in organic solar cells
spellingShingle Towards optimisation of photocurrent from fullerene excitons in organic solar cells
Stoichko Dimitrov
title_short Towards optimisation of photocurrent from fullerene excitons in organic solar cells
title_full Towards optimisation of photocurrent from fullerene excitons in organic solar cells
title_fullStr Towards optimisation of photocurrent from fullerene excitons in organic solar cells
title_full_unstemmed Towards optimisation of photocurrent from fullerene excitons in organic solar cells
title_sort Towards optimisation of photocurrent from fullerene excitons in organic solar cells
author_id_str_mv 9fc26ec1b8655cd0d66f7196a924fe14
author_id_fullname_str_mv 9fc26ec1b8655cd0d66f7196a924fe14_***_Stoichko Dimitrov
author Stoichko Dimitrov
author2 Stoichko Dimitrov
Zhenggang Huang
Florent Deledalle
Christian B. Nielsen
Bob C. Schroeder
Raja Shahid Ashraf
Safa Shoaee
Iain McCulloch
James R. Durrant
format Journal article
container_title Energy & Environmental Science
container_volume 7
container_issue 3
container_start_page 1037
publishDate 2014
institution Swansea University
issn 1754-5692
1754-5706
doi_str_mv 10.1039/c3ee42607f
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 - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
url http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&amp;SrcAuth=ORCID&amp;SrcApp=OrcidOrg&amp;DestLinkType=FullRecord&amp;DestApp=WOS_CPL&amp;KeyUT=WOS:000333203900021&amp;KeyUID=WOS:000333203900021
document_store_str 0
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description Photocurrent from fullerene excitons in polymer–fullerene solar cells is optimised by employing a series of low bandgap diketopyrrolopyrrole-containing polymers with differing molecular weights. The low LUMO level of this donor polymer prevents efficient charge generation from polymer excitons, allowing us to focus on charge and photocurrent generation specifically from fullerene excitons. We employ femtosecond transient absorption spectroscopy and transmission electron microscopy to show a correlation between fullerene domain size and the kinetics of polaron generation from fullerene excitons, and relate these observations to device efficiency. Charge generation from fullerene excitons is shown to occur on the 0.5 ns timescale, limited by the kinetics of diffusion of fullerene excitons to domain interfaces with donor polymers. For devices employing the highest molecular weight donor polymer, ∼7 mA cm−2 of photocurrent is observed from fullerene excitons, leading to an overall device efficiency of 5.2%.
published_date 2014-12-31T03:38:52Z
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score 11.036116

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