Photo-induced halide redistribution in organic-inorganic perovskite films

deQuilettes, Dane, Zhang, Wei, Burlakov, Victor , Graham, Daniel, Leijtens, Tomas, Osherov, Anna, Bulović, Vladimir, Snaith, Henry, Ginger, David and Stranks, Samuel (2016) Photo-induced halide redistribution in organic-inorganic perovskite films. Nature Communications, 7 (1). p. 11683. ISSN 2041-1723

Full content URL: http://doi.org/10.1038/ncomms11683

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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 (ToF-SIMS), 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 which collectively impact optoelectronic performance.

Keywords:organic-inorganic perovskite, photoluminescence, photovoltaic, confocal fluorescence microscopy, ion migration, time-of-flight secondary ion mass spectrometry, solar cell, NotOAChecked
Subjects:F Physical Sciences > F200 Materials Science
J Technologies > J910 Energy Technologies
F Physical Sciences > F120 Inorganic Chemistry
Divisions:College of Science > School of Chemistry
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ID Code:23049
Deposited On:22 Apr 2016 09:43

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