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Photo-stability study of a solution-processed small molecule solar cell system: correlation between molecular conformation and degradation

Michael J. Newman, Emily M. Speller, Jérémy Barbé, Joel Luke, Meng Li, Zhe Li, Zhao-Kui Wang, Sagar Jain, Ji-Seon Kim, Harrison Ka Hin Lee, Wing Chung Tsoi, Wing Chung Tsoi Orcid Logo

Science and Technology of Advanced Materials, Volume: 19, Issue: 1, Pages: 194 - 202

Swansea University Authors: Sagar Jain, Wing Chung Tsoi Orcid Logo

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DOI (Published version): 10.1080/14686996.2018.1433948

Abstract

Solution-processed organic small molecule solar cells (SMSCs) have achieved efficiency over 11%. However, very few studies have focused on their stability under illumination and the origin of the degradation during the so-called burn-in period. Here, we studied the burn-in period of a solution-proce...

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Published in: Science and Technology of Advanced Materials
ISSN: 1468-6996 1878-5514
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa38806
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spelling 2018-04-23T14:58:38.7207325 v2 38806 2018-02-20 Photo-stability study of a solution-processed small molecule solar cell system: correlation between molecular conformation and degradation 7073e179bb5b82db3e3efd3a8cd07139 Sagar Jain Sagar Jain true false 7e5f541df6635a9a8e1a579ff2de5d56 0000-0003-3836-5139 Wing Chung Tsoi Wing Chung Tsoi true false 2018-02-20 EEN Solution-processed organic small molecule solar cells (SMSCs) have achieved efficiency over 11%. However, very few studies have focused on their stability under illumination and the origin of the degradation during the so-called burn-in period. Here, we studied the burn-in period of a solution-processed SMSC using benzodithiophene terthiophene rhodamine:[6,6]-phenyl C71 butyric acid methyl ester (BTR:PC71BM) with increasing solvent vapour annealing time applied to the active layer, controlling the crystallisation of the BTR phase. We find that the burn-in behaviour is strongly correlated to the crystallinity of BTR. To look at the possible degradation mechanisms, we studied the fresh and photo-aged blend films with grazing incidence X-ray diffraction, UV-Vis absorbance, Raman spectroscopy, and photoluminescence (PL) spectroscopy. Although the crystallinity of BTR affects the performance drop during the burn-in period, the degradation is found not to originate from the crystallinity changes of the BTR phase, but correlates with changes in molecular conformation – rotation of the thiophene side chains, as resolved by Raman spectroscopy which could be correlated to slight photobleaching and changes in PL spectra. Journal Article Science and Technology of Advanced Materials 19 1 194 202 1468-6996 1878-5514 Small molecule solar cells, BTR, photobleaching, burn-in, Raman spectroscopy, molecular conformation 31 12 2018 2018-12-31 10.1080/14686996.2018.1433948 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2018-04-23T14:58:38.7207325 2018-02-20T12:46:49.0747601 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Michael J. Newman 1 Emily M. Speller 2 Jérémy Barbé 3 Joel Luke 4 Meng Li 5 Zhe Li 6 Zhao-Kui Wang 7 Sagar Jain 8 Ji-Seon Kim 9 Harrison Ka Hin Lee 10 Wing Chung Tsoi 11 Wing Chung Tsoi 0000-0003-3836-5139 12 0038806-23042018145728.pdf NewmanPhotoStability2018.pdf 2018-04-23T14:57:28.7070000 Output 2770850 application/pdf Version of Record true 2018-04-23T00:00:00.0000000 true eng
title Photo-stability study of a solution-processed small molecule solar cell system: correlation between molecular conformation and degradation
spellingShingle Photo-stability study of a solution-processed small molecule solar cell system: correlation between molecular conformation and degradation
Sagar Jain
Wing Chung Tsoi
title_short Photo-stability study of a solution-processed small molecule solar cell system: correlation between molecular conformation and degradation
title_full Photo-stability study of a solution-processed small molecule solar cell system: correlation between molecular conformation and degradation
title_fullStr Photo-stability study of a solution-processed small molecule solar cell system: correlation between molecular conformation and degradation
title_full_unstemmed Photo-stability study of a solution-processed small molecule solar cell system: correlation between molecular conformation and degradation
title_sort Photo-stability study of a solution-processed small molecule solar cell system: correlation between molecular conformation and degradation
author_id_str_mv 7073e179bb5b82db3e3efd3a8cd07139
7e5f541df6635a9a8e1a579ff2de5d56
author_id_fullname_str_mv 7073e179bb5b82db3e3efd3a8cd07139_***_Sagar Jain
7e5f541df6635a9a8e1a579ff2de5d56_***_Wing Chung Tsoi
author Sagar Jain
Wing Chung Tsoi
author2 Michael J. Newman
Emily M. Speller
Jérémy Barbé
Joel Luke
Meng Li
Zhe Li
Zhao-Kui Wang
Sagar Jain
Ji-Seon Kim
Harrison Ka Hin Lee
Wing Chung Tsoi
Wing Chung Tsoi
format Journal article
container_title Science and Technology of Advanced Materials
container_volume 19
container_issue 1
container_start_page 194
publishDate 2018
institution Swansea University
issn 1468-6996
1878-5514
doi_str_mv 10.1080/14686996.2018.1433948
college_str Faculty of Science and Engineering
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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 Solution-processed organic small molecule solar cells (SMSCs) have achieved efficiency over 11%. However, very few studies have focused on their stability under illumination and the origin of the degradation during the so-called burn-in period. Here, we studied the burn-in period of a solution-processed SMSC using benzodithiophene terthiophene rhodamine:[6,6]-phenyl C71 butyric acid methyl ester (BTR:PC71BM) with increasing solvent vapour annealing time applied to the active layer, controlling the crystallisation of the BTR phase. We find that the burn-in behaviour is strongly correlated to the crystallinity of BTR. To look at the possible degradation mechanisms, we studied the fresh and photo-aged blend films with grazing incidence X-ray diffraction, UV-Vis absorbance, Raman spectroscopy, and photoluminescence (PL) spectroscopy. Although the crystallinity of BTR affects the performance drop during the burn-in period, the degradation is found not to originate from the crystallinity changes of the BTR phase, but correlates with changes in molecular conformation – rotation of the thiophene side chains, as resolved by Raman spectroscopy which could be correlated to slight photobleaching and changes in PL spectra.
published_date 2018-12-31T03:49:12Z
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