Details

Autor(en) / Beteiligte

• 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

Titel

Photo-induced halide redistribution in organic-inorganic perovskite films

Ist Teil von

• Nature communications, 2016-05, Vol.7 (1), p.11683-11683, Article 11683

Ort / Verlag

England: Nature Publishing Group

Erscheinungsjahr

2016

Link zum Volltext

Quelle

MEDLINE

Beschreibungen/Notizen

• 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.