Photo-induced halide redistribution in organic-inorganic perovskite films

deQuilettes, Dane and Zhang, Wei and Burlakov, Victor and Graham, Daniel and Leijtens, Tomas and Osherov, Anna and Bulović, Vladimir and Snaith, Henry and 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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