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Photochemical stability of high efficiency PTB7:PC70BM solar cell blends

Joseph Razzell-Hollis, Jessica Wade, Wing Chung Tsoi Orcid Logo, Ying Soon, James Durrant Orcid Logo, Ji-Seon Kim

Journal of Materials Chemistry A, Volume: 2, Issue: 47, Pages: 20189 - 20195

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

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DOI (Published version): 10.1039/C4TA05641H

Abstract

Thieno[3,4 b]thiophene-alt-benzodithiophene (PTB7) is a promising donor–acceptor copolymer that has achieved high efficiencies (7–9%) in organic solar cells but suffers from poor stability and degrades when exposed to light and oxygen. Using resonant Raman spectroscopy to examine the nature of this...

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Published in: Journal of Materials Chemistry A
ISSN: 2050-7488 2050-7496
Published: 2014
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URI: https://cronfa.swan.ac.uk/Record/cronfa32053
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spelling 2021-01-14T13:11:34.2317284 v2 32053 2017-02-23 Photochemical stability of high efficiency PTB7:PC70BM solar cell blends 7e5f541df6635a9a8e1a579ff2de5d56 0000-0003-3836-5139 Wing Chung Tsoi Wing Chung Tsoi true false f3dd64bc260e5c07adfa916c27dbd58a 0000-0001-8353-7345 James Durrant James Durrant true false 2017-02-23 MTLS Thieno[3,4 b]thiophene-alt-benzodithiophene (PTB7) is a promising donor–acceptor copolymer that has achieved high efficiencies (7–9%) in organic solar cells but suffers from poor stability and degrades when exposed to light and oxygen. Using resonant Raman spectroscopy to examine the nature of this photo-oxidation, three main changes to the vibrations of the conjugated backbone are observed: (1) shift of the benzodithiophene (BDT) C[double bond, length as m-dash]C stretch peak at ∼1489 cm−1 up to ∼1499 cm−1; (2) increase in the relative intensity of coupled fused thiophene and benzene C[double bond, length as m-dash]C stretch peaks at ∼1535 and ∼1575 cm−1; (3) appearance of a new peak at ∼1650 cm−1; which suggest oxidation takes place on the BDT unit without loss of conjugation. In situ accelerated photo-degradation reveals that the observed oxidation is the initial step of degradation, which is followed by reductions in absorption and Raman scattering intensities that indicate the loss of chromophores by a second, more extensive oxidation step. Blending PTB7 with PC70BM is found to accelerate the polymer's degradation, and further shift the BDT peak to ∼1509 cm−1. Using density functional theory to simulate Raman spectra for several possible oxidised products, the initial oxidation is best described by hydroxylation of 3rd and 7th positions on the BDT donor unit. Journal Article Journal of Materials Chemistry A 2 47 20189 20195 2050-7488 2050-7496 21 12 2014 2014-12-21 10.1039/C4TA05641H COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2021-01-14T13:11:34.2317284 2017-02-23T09:34:29.7438441 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Joseph Razzell-Hollis 1 Jessica Wade 2 Wing Chung Tsoi 0000-0003-3836-5139 3 Ying Soon 4 James Durrant 0000-0001-8353-7345 5 Ji-Seon Kim 6
title Photochemical stability of high efficiency PTB7:PC70BM solar cell blends
spellingShingle Photochemical stability of high efficiency PTB7:PC70BM solar cell blends
Wing Chung Tsoi
James Durrant
title_short Photochemical stability of high efficiency PTB7:PC70BM solar cell blends
title_full Photochemical stability of high efficiency PTB7:PC70BM solar cell blends
title_fullStr Photochemical stability of high efficiency PTB7:PC70BM solar cell blends
title_full_unstemmed Photochemical stability of high efficiency PTB7:PC70BM solar cell blends
title_sort Photochemical stability of high efficiency PTB7:PC70BM solar cell blends
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 Joseph Razzell-Hollis
Jessica Wade
Wing Chung Tsoi
Ying Soon
James Durrant
Ji-Seon Kim
format Journal article
container_title Journal of Materials Chemistry A
container_volume 2
container_issue 47
container_start_page 20189
publishDate 2014
institution Swansea University
issn 2050-7488
2050-7496
doi_str_mv 10.1039/C4TA05641H
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
document_store_str 0
active_str 0
description Thieno[3,4 b]thiophene-alt-benzodithiophene (PTB7) is a promising donor–acceptor copolymer that has achieved high efficiencies (7–9%) in organic solar cells but suffers from poor stability and degrades when exposed to light and oxygen. Using resonant Raman spectroscopy to examine the nature of this photo-oxidation, three main changes to the vibrations of the conjugated backbone are observed: (1) shift of the benzodithiophene (BDT) C[double bond, length as m-dash]C stretch peak at ∼1489 cm−1 up to ∼1499 cm−1; (2) increase in the relative intensity of coupled fused thiophene and benzene C[double bond, length as m-dash]C stretch peaks at ∼1535 and ∼1575 cm−1; (3) appearance of a new peak at ∼1650 cm−1; which suggest oxidation takes place on the BDT unit without loss of conjugation. In situ accelerated photo-degradation reveals that the observed oxidation is the initial step of degradation, which is followed by reductions in absorption and Raman scattering intensities that indicate the loss of chromophores by a second, more extensive oxidation step. Blending PTB7 with PC70BM is found to accelerate the polymer's degradation, and further shift the BDT peak to ∼1509 cm−1. Using density functional theory to simulate Raman spectra for several possible oxidised products, the initial oxidation is best described by hydroxylation of 3rd and 7th positions on the BDT donor unit.
published_date 2014-12-21T03:39:13Z
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score 11.016235

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