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Shining a light on the photoluminescence behaviour of methylammonium lead iodide perovskite: investigating the competing photobrightening and photodarkening processes

Emmanuel V. Péan, Catherine S. De Castro, Matthew Davies Orcid Logo

Materials Letters, Volume: 243, Pages: 191 - 194

Swansea University Author: Matthew Davies Orcid Logo

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DOI (Published version): 10.1016/j.matlet.2019.01.103

Abstract

Organic-inorganic perovskite materials, such as methylammonium lead iodide, are good candidates for the next generation of solar cells with an impressive certified 23.3% power conversion efficiency. However, their development is impeded by their poor stability to oxygen, moisture, light and combinat...

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Published in: Materials Letters
ISSN: 0167577X
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa48666
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first_indexed 2019-02-01T20:05:51Z
last_indexed 2020-08-13T03:14:59Z
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spelling 2020-08-12T13:13:12.5480855 v2 48666 2019-02-01 Shining a light on the photoluminescence behaviour of methylammonium lead iodide perovskite: investigating the competing photobrightening and photodarkening processes 4ad478e342120ca3434657eb13527636 0000-0003-2595-5121 Matthew Davies Matthew Davies true false 2019-02-01 CHEG Organic-inorganic perovskite materials, such as methylammonium lead iodide, are good candidates for the next generation of solar cells with an impressive certified 23.3% power conversion efficiency. However, their development is impeded by their poor stability to oxygen, moisture, light and combinations of these. The bulk photoluminescence of perovskite films is extremely sensitive to the environment (humidity, light intensity, temperature, atmosphere) and has been shown to undergo rapid photobrightening and photodarkening processes. Here, we study the changes in photoluminescence behaviour (intensity, wavelength and full-width-at-half-maximum) in both air and nitrogen and correlate this with changes in the crystal structure of the films under illumination with XRD. We show that photodarkening is caused by degradation of the perovskite and that both brightening and some degree of darkening are competitive processes occurring simultaneously. During photobrightening the fluorescence emission spectrum red-shifts which can be explained by the halide redistribution and passivation of trap states in the perovskite. We conclude that care is required when measuring fluorescence of perovskite due to the important variations in intensity, emission wavelength and full-width-at-half-maximum. Journal Article Materials Letters 243 191 194 0167577X photobrightening, photodarkening, perovskite, CH3NH3PbI3, fluorescence, degradation 31 12 2019 2019-12-31 10.1016/j.matlet.2019.01.103 COLLEGE NANME Chemical Engineering COLLEGE CODE CHEG Swansea University 2020-08-12T13:13:12.5480855 2019-02-01T16:34:31.0876095 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemical Engineering Emmanuel V. Péan 1 Catherine S. De Castro 2 Matthew Davies 0000-0003-2595-5121 3 0048666-01022019163704.pdf pean2019.pdf 2019-02-01T16:37:04.7800000 Output 4437476 application/pdf Accepted Manuscript true 2020-01-25T00:00:00.0000000 true eng
title Shining a light on the photoluminescence behaviour of methylammonium lead iodide perovskite: investigating the competing photobrightening and photodarkening processes
spellingShingle Shining a light on the photoluminescence behaviour of methylammonium lead iodide perovskite: investigating the competing photobrightening and photodarkening processes
Matthew Davies
title_short Shining a light on the photoluminescence behaviour of methylammonium lead iodide perovskite: investigating the competing photobrightening and photodarkening processes
title_full Shining a light on the photoluminescence behaviour of methylammonium lead iodide perovskite: investigating the competing photobrightening and photodarkening processes
title_fullStr Shining a light on the photoluminescence behaviour of methylammonium lead iodide perovskite: investigating the competing photobrightening and photodarkening processes
title_full_unstemmed Shining a light on the photoluminescence behaviour of methylammonium lead iodide perovskite: investigating the competing photobrightening and photodarkening processes
title_sort Shining a light on the photoluminescence behaviour of methylammonium lead iodide perovskite: investigating the competing photobrightening and photodarkening processes
author_id_str_mv 4ad478e342120ca3434657eb13527636
author_id_fullname_str_mv 4ad478e342120ca3434657eb13527636_***_Matthew Davies
author Matthew Davies
author2 Emmanuel V. Péan
Catherine S. De Castro
Matthew Davies
format Journal article
container_title Materials Letters
container_volume 243
container_start_page 191
publishDate 2019
institution Swansea University
issn 0167577X
doi_str_mv 10.1016/j.matlet.2019.01.103
college_str Faculty of Science and Engineering
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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 - Chemical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemical Engineering
document_store_str 1
active_str 0
description Organic-inorganic perovskite materials, such as methylammonium lead iodide, are good candidates for the next generation of solar cells with an impressive certified 23.3% power conversion efficiency. However, their development is impeded by their poor stability to oxygen, moisture, light and combinations of these. The bulk photoluminescence of perovskite films is extremely sensitive to the environment (humidity, light intensity, temperature, atmosphere) and has been shown to undergo rapid photobrightening and photodarkening processes. Here, we study the changes in photoluminescence behaviour (intensity, wavelength and full-width-at-half-maximum) in both air and nitrogen and correlate this with changes in the crystal structure of the films under illumination with XRD. We show that photodarkening is caused by degradation of the perovskite and that both brightening and some degree of darkening are competitive processes occurring simultaneously. During photobrightening the fluorescence emission spectrum red-shifts which can be explained by the halide redistribution and passivation of trap states in the perovskite. We conclude that care is required when measuring fluorescence of perovskite due to the important variations in intensity, emission wavelength and full-width-at-half-maximum.
published_date 2019-12-31T03:59:14Z
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score 11.035655

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