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Tuning CH3NH3Pb(I1−xBrx)3 perovskite oxygen stability in thin films and solar cells

Sebastian Pont, Daniel Bryant, Chieh-Ting Lin, Nicholas Aristidou, Scot Wheeler, Xuerui Ma, Robert Godin, Saif A. Haque, James Durrant Orcid Logo

J. Mater. Chem. A, Volume: 5, Issue: 20, Pages: 9553 - 9560

Swansea University Author: James Durrant Orcid Logo

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DOI (Published version): 10.1039/C7TA00058H

Abstract

The rapid development of organic–inorganic lead halide perovskites has resulted in high efficiency photovoltaic devices. However the susceptibility of these devices to degradation under environmental stress has so far hindered commercial development, requiring for example expensive device encapsulat...

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Published in: J. Mater. Chem. A
ISSN: 2050-7488 2050-7496
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa34708
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first_indexed 2017-07-20T14:19:50Z
last_indexed 2018-02-09T05:25:06Z
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spelling 2017-07-20T10:10:59.8589137 v2 34708 2017-07-20 Tuning CH3NH3Pb(I1−xBrx)3 perovskite oxygen stability in thin films and solar cells f3dd64bc260e5c07adfa916c27dbd58a 0000-0001-8353-7345 James Durrant James Durrant true false 2017-07-20 MTLS The rapid development of organic–inorganic lead halide perovskites has resulted in high efficiency photovoltaic devices. However the susceptibility of these devices to degradation under environmental stress has so far hindered commercial development, requiring for example expensive device encapsulation. Herein, we have investigated the stability of CH3NH3Pb(I1−xBrx)3 [x = 0–1] thin films and solar cells under controlled humidity, light, and oxygen conditions. We show that higher bromide ratios increase tolerance to moisture, with x = 1 thin films being stable to 120 h of moisture stress. Under light and dry air, partial bromide (x < 1) substitution does not enhance film stability significantly, with the corresponding solar cells degrading within two hours. In contrast, CH3NH3PbBr3 films show excellent stability, with device stability being limited by the organic interlayer. For these x = 1 films, we show that charge carriers are quenched in the presence of oxygen and form superoxide; however in contrast to perovskites containing iodide, this superoxide does not degrade the crystal. Our observations show that iodide limits the oxygen and light stability of CH3NH3Pb(I1−xBrx)3 perovskites, but that CH3NH3PbBr3 provides an opportunity to develop inherently stable high voltage photovoltaic devices and 4-terminal tandem solar cells. Journal Article J. Mater. Chem. A 5 20 9553 9560 2050-7488 2050-7496 31 12 2017 2017-12-31 10.1039/C7TA00058H COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2017-07-20T10:10:59.8589137 2017-07-20T10:05:54.9380189 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Sebastian Pont 1 Daniel Bryant 2 Chieh-Ting Lin 3 Nicholas Aristidou 4 Scot Wheeler 5 Xuerui Ma 6 Robert Godin 7 Saif A. Haque 8 James Durrant 0000-0001-8353-7345 9
title Tuning CH3NH3Pb(I1−xBrx)3 perovskite oxygen stability in thin films and solar cells
spellingShingle Tuning CH3NH3Pb(I1−xBrx)3 perovskite oxygen stability in thin films and solar cells
James Durrant
title_short Tuning CH3NH3Pb(I1−xBrx)3 perovskite oxygen stability in thin films and solar cells
title_full Tuning CH3NH3Pb(I1−xBrx)3 perovskite oxygen stability in thin films and solar cells
title_fullStr Tuning CH3NH3Pb(I1−xBrx)3 perovskite oxygen stability in thin films and solar cells
title_full_unstemmed Tuning CH3NH3Pb(I1−xBrx)3 perovskite oxygen stability in thin films and solar cells
title_sort Tuning CH3NH3Pb(I1−xBrx)3 perovskite oxygen stability in thin films and solar cells
author_id_str_mv f3dd64bc260e5c07adfa916c27dbd58a
author_id_fullname_str_mv f3dd64bc260e5c07adfa916c27dbd58a_***_James Durrant
author James Durrant
author2 Sebastian Pont
Daniel Bryant
Chieh-Ting Lin
Nicholas Aristidou
Scot Wheeler
Xuerui Ma
Robert Godin
Saif A. Haque
James Durrant
format Journal article
container_title J. Mater. Chem. A
container_volume 5
container_issue 20
container_start_page 9553
publishDate 2017
institution Swansea University
issn 2050-7488
2050-7496
doi_str_mv 10.1039/C7TA00058H
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 The rapid development of organic–inorganic lead halide perovskites has resulted in high efficiency photovoltaic devices. However the susceptibility of these devices to degradation under environmental stress has so far hindered commercial development, requiring for example expensive device encapsulation. Herein, we have investigated the stability of CH3NH3Pb(I1−xBrx)3 [x = 0–1] thin films and solar cells under controlled humidity, light, and oxygen conditions. We show that higher bromide ratios increase tolerance to moisture, with x = 1 thin films being stable to 120 h of moisture stress. Under light and dry air, partial bromide (x < 1) substitution does not enhance film stability significantly, with the corresponding solar cells degrading within two hours. In contrast, CH3NH3PbBr3 films show excellent stability, with device stability being limited by the organic interlayer. For these x = 1 films, we show that charge carriers are quenched in the presence of oxygen and form superoxide; however in contrast to perovskites containing iodide, this superoxide does not degrade the crystal. Our observations show that iodide limits the oxygen and light stability of CH3NH3Pb(I1−xBrx)3 perovskites, but that CH3NH3PbBr3 provides an opportunity to develop inherently stable high voltage photovoltaic devices and 4-terminal tandem solar cells.
published_date 2017-12-31T03:43:04Z
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score 11.016235

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