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Dynamic PCBM:Dimer Population in Solar Cells under Light and Temperature Fluctuations

Sebastian Pont, James Durrant Orcid Logo, João T. Cabral

Advanced Energy Materials, Start page: 1803948

Swansea University Author: James Durrant Orcid Logo

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DOI (Published version): 10.1002/aenm.201803948

Abstract

Photoinduced dimerization of phenyl‐C61‐butyric acid methyl ester (PCBM) has a significant impact on the stability of polymer:PCBM organic solar cells (OSCs). This reaction is reversible, as dimers can be thermally decomposed at sufficiently elevated temperatures and both photodimerization and decom...

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Published in: Advanced Energy Materials
ISSN: 1614-6832 1614-6840
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa49925
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first_indexed 2019-04-09T13:04:49Z
last_indexed 2019-06-24T14:53:18Z
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spelling 2019-06-24T11:28:59.2368465 v2 49925 2019-04-08 Dynamic PCBM:Dimer Population in Solar Cells under Light and Temperature Fluctuations f3dd64bc260e5c07adfa916c27dbd58a 0000-0001-8353-7345 James Durrant James Durrant true false 2019-04-08 MTLS Photoinduced dimerization of phenyl‐C61‐butyric acid methyl ester (PCBM) has a significant impact on the stability of polymer:PCBM organic solar cells (OSCs). This reaction is reversible, as dimers can be thermally decomposed at sufficiently elevated temperatures and both photodimerization and decomposition are temperature dependent. In operando conditions of OSCs evidently involve exposure to both light and heat, following periodic diurnal and seasonal profiles. In this work, the kinetics of dimer formation and decomposition are examined and quantified as a function of temperature, light intensity, blend composition, and time. The activation energy for photodimerization is estimated to be 0.021(3) eV, considerably smaller than that for decomposition (0.96 eV). The findings are benchmarked with a variety of conjugated polymer matrices to propose a descriptive dynamic model of PCBM:dimer population in OSCs, and a framework is proposed to rationalize its interplay with morphology evolution and charge quenching. The model and parameters enable the prediction of the dynamic and long‐term PCBM:dimer populations, under variable temperature and light conditions, which impact the morphological stability of OSCs. Journal Article Advanced Energy Materials 1803948 1614-6832 1614-6840 16 5 2019 2019-05-16 10.1002/aenm.201803948 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2019-06-24T11:28:59.2368465 2019-04-08T09:56:01.7463683 Sebastian Pont 1 James Durrant 0000-0001-8353-7345 2 João T. Cabral 3 0049925-24062019112729.pdf pont2019(3).pdf 2019-06-24T11:27:29.0030000 Output 2175825 application/pdf Accepted Manuscript true 2020-03-27T00:00:00.0000000 false eng
title Dynamic PCBM:Dimer Population in Solar Cells under Light and Temperature Fluctuations
spellingShingle Dynamic PCBM:Dimer Population in Solar Cells under Light and Temperature Fluctuations
James Durrant
title_short Dynamic PCBM:Dimer Population in Solar Cells under Light and Temperature Fluctuations
title_full Dynamic PCBM:Dimer Population in Solar Cells under Light and Temperature Fluctuations
title_fullStr Dynamic PCBM:Dimer Population in Solar Cells under Light and Temperature Fluctuations
title_full_unstemmed Dynamic PCBM:Dimer Population in Solar Cells under Light and Temperature Fluctuations
title_sort Dynamic PCBM:Dimer Population in Solar Cells under Light and Temperature Fluctuations
author_id_str_mv f3dd64bc260e5c07adfa916c27dbd58a
author_id_fullname_str_mv f3dd64bc260e5c07adfa916c27dbd58a_***_James Durrant
author James Durrant
author2 Sebastian Pont
James Durrant
João T. Cabral
format Journal article
container_title Advanced Energy Materials
container_start_page 1803948
publishDate 2019
institution Swansea University
issn 1614-6832
1614-6840
doi_str_mv 10.1002/aenm.201803948
document_store_str 1
active_str 0
description Photoinduced dimerization of phenyl‐C61‐butyric acid methyl ester (PCBM) has a significant impact on the stability of polymer:PCBM organic solar cells (OSCs). This reaction is reversible, as dimers can be thermally decomposed at sufficiently elevated temperatures and both photodimerization and decomposition are temperature dependent. In operando conditions of OSCs evidently involve exposure to both light and heat, following periodic diurnal and seasonal profiles. In this work, the kinetics of dimer formation and decomposition are examined and quantified as a function of temperature, light intensity, blend composition, and time. The activation energy for photodimerization is estimated to be 0.021(3) eV, considerably smaller than that for decomposition (0.96 eV). The findings are benchmarked with a variety of conjugated polymer matrices to propose a descriptive dynamic model of PCBM:dimer population in OSCs, and a framework is proposed to rationalize its interplay with morphology evolution and charge quenching. The model and parameters enable the prediction of the dynamic and long‐term PCBM:dimer populations, under variable temperature and light conditions, which impact the morphological stability of OSCs.
published_date 2019-05-16T04:01:11Z
_version_ 1763753141888614400
score 11.028886

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