Title |
Photo-induced halide redistribution in organic–inorganic perovskite films
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Published in |
Nature Communications, May 2016
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DOI | 10.1038/ncomms11683 |
Pubmed ID | |
Authors |
Dane W. deQuilettes, Wei Zhang, Victor M. Burlakov, Daniel J. Graham, Tomas Leijtens, Anna Osherov, Vladimir Bulović, Henry J. Snaith, David S. Ginger, Samuel D. Stranks |
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. |
X Demographics
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Unknown | 1 | 100% |
Demographic breakdown
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Members of the public | 1 | 100% |
Mendeley readers
Geographical breakdown
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Germany | 2 | <1% |
Sweden | 1 | <1% |
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Unknown | 830 | 99% |
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Researcher | 136 | 16% |
Student > Master | 98 | 12% |
Student > Bachelor | 45 | 5% |
Student > Doctoral Student | 37 | 4% |
Other | 112 | 13% |
Unknown | 139 | 17% |
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Materials Science | 200 | 24% |
Physics and Astronomy | 158 | 19% |
Chemistry | 135 | 16% |
Engineering | 84 | 10% |
Energy | 38 | 5% |
Other | 51 | 6% |
Unknown | 171 | 20% |