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Stoichiometry-dependent local instability in MAPbI3 perovskite materials and devices

Vikas Kumar, Jérémy Barbé, Whitney L. Schmidt, Konstantinos Tsevas, Buse Ozkan, Christopher M. Handley, Colin L. Freeman, Derek C. Sinclair, Ian M. Reaney, Wing C. Tsoi, Alan Dunbar, Cornelia Rodenburg, Wing Chung Tsoi Orcid Logo

Journal of Materials Chemistry A, Volume: 6, Issue: 46, Pages: 23578 - 23586

Swansea University Author: Wing Chung Tsoi Orcid Logo

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DOI (Published version): 10.1039/C8TA08231F

Abstract

Organometallic perovskite materials based on MAPbI3 achieve photovoltaic efficiencies as high as 22% for solar cells; however, the long-term stability of these perovskite materials is still a hurdle for applications. Here, we report the air and charge induced instabilities of MAPbI3 perovskite mater...

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Published in: Journal of Materials Chemistry A
ISSN: 2050-7488 2050-7496
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa47935
first_indexed 2018-12-11T20:05:07Z
last_indexed 2019-01-28T14:02:26Z
id cronfa47935
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spelling 2019-01-28T12:16:34.7721338 v2 47935 2018-12-11 Stoichiometry-dependent local instability in MAPbI3 perovskite materials and devices 7e5f541df6635a9a8e1a579ff2de5d56 0000-0003-3836-5139 Wing Chung Tsoi Wing Chung Tsoi true false 2018-12-11 EAAS Organometallic perovskite materials based on MAPbI3 achieve photovoltaic efficiencies as high as 22% for solar cells; however, the long-term stability of these perovskite materials is still a hurdle for applications. Here, we report the air and charge induced instabilities of MAPbI3 perovskite materials with different local stoichiometry using Secondary Electron Hyperspectral Imaging (SEHI). We find that individual grains which do not have the ideal ABX3 stoichiometry degrade faster than stoichiometric grains. We also observe that the degradation pathways depend on the local stoichiometry. Non-stoichiometric grains (with excess MAI) degrade from the centre of the grain and further degradation moves towards the grain boundary, whereas in stoichiometric grains degradation sets in at the grain boundary. We further use deliberately high doses of electron beam exposure to highlight the presence of local non-stoichiometry in device cross-sections of bias degraded devices which pinpoints different onset locations of degradation, depending on the local stoichiometry. These results, therefore, show that precise control of local stoichiometry is required to improve the stability of MAPbI3 and thus the lifetime of perovskite solar cells. Journal Article Journal of Materials Chemistry A 6 46 23578 23586 2050-7488 2050-7496 31 12 2018 2018-12-31 10.1039/C8TA08231F COLLEGE NANME Engineering and Applied Sciences School COLLEGE CODE EAAS Swansea University 2019-01-28T12:16:34.7721338 2018-12-11T14:55:53.5065821 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Vikas Kumar 1 Jérémy Barbé 2 Whitney L. Schmidt 3 Konstantinos Tsevas 4 Buse Ozkan 5 Christopher M. Handley 6 Colin L. Freeman 7 Derek C. Sinclair 8 Ian M. Reaney 9 Wing C. Tsoi 10 Alan Dunbar 11 Cornelia Rodenburg 12 Wing Chung Tsoi 0000-0003-3836-5139 13 0047935-11122018145729.pdf kumar2018(3).pdf 2018-12-11T14:57:29.7800000 Output 5290817 application/pdf Version of Record true 2018-12-11T00:00:00.0000000 true eng
title Stoichiometry-dependent local instability in MAPbI3 perovskite materials and devices
spellingShingle Stoichiometry-dependent local instability in MAPbI3 perovskite materials and devices
Wing Chung Tsoi
title_short Stoichiometry-dependent local instability in MAPbI3 perovskite materials and devices
title_full Stoichiometry-dependent local instability in MAPbI3 perovskite materials and devices
title_fullStr Stoichiometry-dependent local instability in MAPbI3 perovskite materials and devices
title_full_unstemmed Stoichiometry-dependent local instability in MAPbI3 perovskite materials and devices
title_sort Stoichiometry-dependent local instability in MAPbI3 perovskite materials and devices
author_id_str_mv 7e5f541df6635a9a8e1a579ff2de5d56
author_id_fullname_str_mv 7e5f541df6635a9a8e1a579ff2de5d56_***_Wing Chung Tsoi
author Wing Chung Tsoi
author2 Vikas Kumar
Jérémy Barbé
Whitney L. Schmidt
Konstantinos Tsevas
Buse Ozkan
Christopher M. Handley
Colin L. Freeman
Derek C. Sinclair
Ian M. Reaney
Wing C. Tsoi
Alan Dunbar
Cornelia Rodenburg
Wing Chung Tsoi
format Journal article
container_title Journal of Materials Chemistry A
container_volume 6
container_issue 46
container_start_page 23578
publishDate 2018
institution Swansea University
issn 2050-7488
2050-7496
doi_str_mv 10.1039/C8TA08231F
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 1
active_str 0
description Organometallic perovskite materials based on MAPbI3 achieve photovoltaic efficiencies as high as 22% for solar cells; however, the long-term stability of these perovskite materials is still a hurdle for applications. Here, we report the air and charge induced instabilities of MAPbI3 perovskite materials with different local stoichiometry using Secondary Electron Hyperspectral Imaging (SEHI). We find that individual grains which do not have the ideal ABX3 stoichiometry degrade faster than stoichiometric grains. We also observe that the degradation pathways depend on the local stoichiometry. Non-stoichiometric grains (with excess MAI) degrade from the centre of the grain and further degradation moves towards the grain boundary, whereas in stoichiometric grains degradation sets in at the grain boundary. We further use deliberately high doses of electron beam exposure to highlight the presence of local non-stoichiometry in device cross-sections of bias degraded devices which pinpoints different onset locations of degradation, depending on the local stoichiometry. These results, therefore, show that precise control of local stoichiometry is required to improve the stability of MAPbI3 and thus the lifetime of perovskite solar cells.
published_date 2018-12-31T04:41:20Z
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