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Photo-induced halide redistribution in organic–inorganic perovskite films

deQuilettes, D, Zhang, Wei, Burlakov, V, Graham, D, Leijtens, T, Osherov, A, Bulović, V, Snaith, H, Ginger, D and Stranks, S (2016) Photo-induced halide redistribution in organic–inorganic perovskite films Nature Communications, 7, 11683. pp. 1-9.

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Abstract

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.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
NameEmailORCID
deQuilettes, DUNSPECIFIEDUNSPECIFIED
Zhang, Weiwz0003@surrey.ac.ukUNSPECIFIED
Burlakov, VUNSPECIFIEDUNSPECIFIED
Graham, DUNSPECIFIEDUNSPECIFIED
Leijtens, TUNSPECIFIEDUNSPECIFIED
Osherov, AUNSPECIFIEDUNSPECIFIED
Bulović, VUNSPECIFIEDUNSPECIFIED
Snaith, HUNSPECIFIEDUNSPECIFIED
Ginger, DUNSPECIFIEDUNSPECIFIED
Stranks, SUNSPECIFIEDUNSPECIFIED
Date : 24 May 2016
Identification Number : 10.1038/ncomms11683
Copyright Disclaimer : 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/
Depositing User : Clive Harris
Date Deposited : 06 Jun 2017 07:16
Last Modified : 31 Oct 2017 19:22
URI: http://epubs.surrey.ac.uk/id/eprint/841301

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