期刊
NATURE COMMUNICATIONS
卷 7, 期 -, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/ncomms10896
关键词
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资金
- Natural Science Foundation of China [51372223, 91333203, 51522209, 11474164, 61405091, 11474249, 91433204]
- Program for Innovative Research Team in University of Ministry of Education of China [IRT13037]
- National Basic Research Program of China- Fundamental Studies of Perovskite Solar Cells [2015CB932200]
- Natural Science Foundation of Jiangsu Province, China [BK20131413, BK20140952]
- National 973 Program of China [2015CB654901]
- Synergetic Innovation Center for Organic Electronics and Information Displays
- Fundamental Research Funds for the Central Universities [2014FZA4008, 2015FZA3005]
Organolead trihalide perovskites have attracted great attention due to the stunning advances in both photovoltaic and light-emitting devices. However, the photophysical properties, especially the recombination dynamics of photogenerated carriers, of this class of materials are controversial. Here we report that under an excitation level close to the working regime of solar cells, the recombination of photogenerated carriers in solution-processed methylammonium-lead-halide films is dominated by excitons weakly localized in band tail states. This scenario is evidenced by experiments of spectral-dependent luminescence decay, excitation density-dependent luminescence and frequency-dependent terahertz photoconductivity. The exciton localization effect is found to be general for several solution-processed hybrid perovskite films prepared by different methods. Our results provide insights into the charge transport and recombination mechanism in perovskite films and help to unravel their potential for high-performance optoelectronic devices.
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