Photo-induced halide redistribution in organic–inorganic perovskite films

Organic–inorganic perovskites such as CH3NH3PbI3 are promising materials for a variety of optoelectronic applications, with certified power conversion efficiencies in solar cells already exceeding 21%. Nevertheless, state-of-the-art films still contain performance-limiting non-radiative recombinatio...

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Main Authors:	deQuilettes, Dane W., Zhang, Wei, Burlakov, Victor M., Graham, Daniel J., Leijtens, Tomas, Osherov, Anna, Bulović, Vladimir, Snaith, Henry J., Ginger, David S., Stranks, Samuel D.
Format:	Online
Language:	English
Published:	Nature Publishing Group 2016
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4890321/

id	pubmed-4890321
recordtype	oai_dc
spelling	pubmed-48903212016-06-10 Photo-induced halide redistribution in organic–inorganic perovskite films deQuilettes, Dane W. Zhang, Wei Burlakov, Victor M. Graham, Daniel J. Leijtens, Tomas Osherov, Anna Bulović, Vladimir Snaith, Henry J. Ginger, David S. Stranks, Samuel D. Article Organic–inorganic perovskites such as CH3NH3PbI3 are promising materials for a variety of optoelectronic applications, with certified power conversion efficiencies in solar cells already exceeding 21%. Nevertheless, state-of-the-art films still contain performance-limiting non-radiative recombination sites and exhibit a range of complex dynamic phenomena under illumination that remain poorly understood. Here we use a unique combination of confocal photoluminescence (PL) microscopy and chemical imaging to correlate the local changes in photophysics with composition in CH3NH3PbI3 films under illumination. We demonstrate that the photo-induced ‘brightening' of the perovskite PL can be attributed to an order-of-magnitude reduction in trap state density. By imaging the same regions with time-of-flight secondary-ion-mass spectrometry, we correlate this photobrightening with a net migration of iodine. Our work provides visual evidence for photo-induced halide migration in triiodide perovskites and reveals the complex interplay between charge carrier populations, electronic traps and mobile halides that collectively impact optoelectronic performance. Nature Publishing Group 2016-05-24 /pmc/articles/PMC4890321/ /pubmed/27216703 http://dx.doi.org/10.1038/ncomms11683 Text en Copyright © 2016, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	deQuilettes, Dane W. Zhang, Wei Burlakov, Victor M. Graham, Daniel J. Leijtens, Tomas Osherov, Anna Bulović, Vladimir Snaith, Henry J. Ginger, David S. Stranks, Samuel D.
spellingShingle	deQuilettes, Dane W. Zhang, Wei Burlakov, Victor M. Graham, Daniel J. Leijtens, Tomas Osherov, Anna Bulović, Vladimir Snaith, Henry J. Ginger, David S. Stranks, Samuel D. Photo-induced halide redistribution in organic–inorganic perovskite films
author_facet	deQuilettes, Dane W. Zhang, Wei Burlakov, Victor M. Graham, Daniel J. Leijtens, Tomas Osherov, Anna Bulović, Vladimir Snaith, Henry J. Ginger, David S. Stranks, Samuel D.
author_sort	deQuilettes, Dane W.
title	Photo-induced halide redistribution in organic–inorganic perovskite films
title_short	Photo-induced halide redistribution in organic–inorganic perovskite films
title_full	Photo-induced halide redistribution in organic–inorganic perovskite films
title_fullStr	Photo-induced halide redistribution in organic–inorganic perovskite films
title_full_unstemmed	Photo-induced halide redistribution in organic–inorganic perovskite films
title_sort	photo-induced halide redistribution in organic–inorganic perovskite films
description	Organic–inorganic perovskites such as CH3NH3PbI3 are promising materials for a variety of optoelectronic applications, with certified power conversion efficiencies in solar cells already exceeding 21%. Nevertheless, state-of-the-art films still contain performance-limiting non-radiative recombination sites and exhibit a range of complex dynamic phenomena under illumination that remain poorly understood. Here we use a unique combination of confocal photoluminescence (PL) microscopy and chemical imaging to correlate the local changes in photophysics with composition in CH3NH3PbI3 films under illumination. We demonstrate that the photo-induced ‘brightening' of the perovskite PL can be attributed to an order-of-magnitude reduction in trap state density. By imaging the same regions with time-of-flight secondary-ion-mass spectrometry, we correlate this photobrightening with a net migration of iodine. Our work provides visual evidence for photo-induced halide migration in triiodide perovskites and reveals the complex interplay between charge carrier populations, electronic traps and mobile halides that collectively impact optoelectronic performance.
publisher	Nature Publishing Group
publishDate	2016
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4890321/
_version_	1613587759173206016

Photo-induced halide redistribution in organic–inorganic perovskite films

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