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Interpretation of inverted photocurrent transients in organic lead halide perovskite solar cells: proof of the field screening by mobile ions and determination of the space charge layer widths / Rebecca A. Belisle, William H. Nguyen, Andrea R. Bowring, Philip Calado, Xiaoe Li, Stuart Irvine, Michael D. McGehee, Piers R. F. Barnes, Brian C. O'Regan

Energy & Environmental Science, Volume: 10, Issue: 1, Pages: 192 - 204

Swansea University Author: Stuart Irvine

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DOI (Published version): 10.1039/C6EE02914K

Abstract

In Methyl Ammonium Lead Iodide (MAPI) perovskite solar cells, screening of the built-in field by mobile ions has been proposed as part of the cause of the large hysteresis observed in the current/voltage scans in many cells. We show that photocurrent transients measured immediately (e.g. 100 ms) aft...

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Published in: Energy & Environmental Science
ISSN: 1754-5692 1754-5706
Published: Royal Society of Chemistry 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa51698
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spelling 2019-10-11T11:50:54.4784821 v2 51698 2019-09-05 Interpretation of inverted photocurrent transients in organic lead halide perovskite solar cells: proof of the field screening by mobile ions and determination of the space charge layer widths 1ddb966eccef99aa96e87f1ea4917f1f 0000-0002-1652-4496 Stuart Irvine Stuart Irvine true false 2019-09-05 MTLS In Methyl Ammonium Lead Iodide (MAPI) perovskite solar cells, screening of the built-in field by mobile ions has been proposed as part of the cause of the large hysteresis observed in the current/voltage scans in many cells. We show that photocurrent transients measured immediately (e.g. 100 ms) after a voltage step can provide direct evidence that this field screening exists. Just after a step to forward bias, the photocurrent transients are reversed in sign (i.e. inverted), and the magnitude of the inverted transients can be used to find an upper bound on the width of the space charge layers adjacent to the electrodes. This in turn provides a lower bound on the mobile charge concentration, which we find to be \1 1017 cm3. Using a new photocurrent transient experiment, we show that the space charge layer thickness remains approximately constant as a function of bias, as expected for mobile ions in a solid electrolyte. We also discuss additional characteristics of the inverted photocurrent transients that imply either an unusually stable deep trapping, or a photo effect on the mobile ion conductivity. Journal Article Energy & Environmental Science 10 1 192 204 Royal Society of Chemistry 1754-5692 1754-5706 perovskite solar cells, transient photocurrent, mobile ion conductivity 31 12 2017 2017-12-31 10.1039/C6EE02914K I provided a cadmium telluride solar cell for transient photocurrent measurement that proved to be a crucial element in publication in a high impact journal. Essentially to compare perovskite devices with an inorganic thin film device. COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2019-10-11T11:50:54.4784821 2019-09-05T13:35:56.1414076 College of Engineering Engineering Rebecca A. Belisle 1 William H. Nguyen 2 Andrea R. Bowring 3 Philip Calado 4 Xiaoe Li 5 Stuart Irvine 0000-0002-1652-4496 6 Michael D. McGehee 7 Piers R. F. Barnes 8 Brian C. O'Regan 9 0051698-11102019115031.pdf belisle2016.pdf 2019-10-11T11:50:31.5270000 Output 9387328 application/pdf Version of Record true 2019-10-11T00:00:00.0000000 false eng
title Interpretation of inverted photocurrent transients in organic lead halide perovskite solar cells: proof of the field screening by mobile ions and determination of the space charge layer widths
spellingShingle Interpretation of inverted photocurrent transients in organic lead halide perovskite solar cells: proof of the field screening by mobile ions and determination of the space charge layer widths
Stuart, Irvine
title_short Interpretation of inverted photocurrent transients in organic lead halide perovskite solar cells: proof of the field screening by mobile ions and determination of the space charge layer widths
title_full Interpretation of inverted photocurrent transients in organic lead halide perovskite solar cells: proof of the field screening by mobile ions and determination of the space charge layer widths
title_fullStr Interpretation of inverted photocurrent transients in organic lead halide perovskite solar cells: proof of the field screening by mobile ions and determination of the space charge layer widths
title_full_unstemmed Interpretation of inverted photocurrent transients in organic lead halide perovskite solar cells: proof of the field screening by mobile ions and determination of the space charge layer widths
title_sort Interpretation of inverted photocurrent transients in organic lead halide perovskite solar cells: proof of the field screening by mobile ions and determination of the space charge layer widths
author_id_str_mv 1ddb966eccef99aa96e87f1ea4917f1f
author_id_fullname_str_mv 1ddb966eccef99aa96e87f1ea4917f1f_***_Stuart, Irvine
author Stuart, Irvine
author2 Rebecca A. Belisle
William H. Nguyen
Andrea R. Bowring
Philip Calado
Xiaoe Li
Stuart Irvine
Michael D. McGehee
Piers R. F. Barnes
Brian C. O'Regan
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container_title Energy & Environmental Science
container_volume 10
container_issue 1
container_start_page 192
publishDate 2017
institution Swansea University
issn 1754-5692
1754-5706
doi_str_mv 10.1039/C6EE02914K
publisher Royal Society of Chemistry
college_str College of Engineering
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hierarchy_parent_id collegeofengineering
hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
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description In Methyl Ammonium Lead Iodide (MAPI) perovskite solar cells, screening of the built-in field by mobile ions has been proposed as part of the cause of the large hysteresis observed in the current/voltage scans in many cells. We show that photocurrent transients measured immediately (e.g. 100 ms) after a voltage step can provide direct evidence that this field screening exists. Just after a step to forward bias, the photocurrent transients are reversed in sign (i.e. inverted), and the magnitude of the inverted transients can be used to find an upper bound on the width of the space charge layers adjacent to the electrodes. This in turn provides a lower bound on the mobile charge concentration, which we find to be \1 1017 cm3. Using a new photocurrent transient experiment, we show that the space charge layer thickness remains approximately constant as a function of bias, as expected for mobile ions in a solid electrolyte. We also discuss additional characteristics of the inverted photocurrent transients that imply either an unusually stable deep trapping, or a photo effect on the mobile ion conductivity.
published_date 2017-12-31T04:16:17Z
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