期刊
NATURE COMMUNICATIONS
卷 7, 期 -, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/ncomms11683
关键词
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资金
- European Union [604032, PIOF-GA-2013-622630]
- DOE [DE-SC0013957]
- NSF [DGE-1256082]
- EPSRC Supergen Supersolar project
- University of Washington, Molecular Engineering and Sciences Institute
- Clean Energy Institute
- National Institutes of Health (NIH)
- National Science Foundation
- NIH [S10 OD010607]
- Center for Excitonics, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001088]
- Engineering and Physical Sciences Research Council [EP/M024881/1, EP/G049653/1] Funding Source: researchfish
- EPSRC [EP/G049653/1, EP/M024881/1] Funding Source: UKRI
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.
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