期刊
ADVANCED FUNCTIONAL MATERIALS
卷 26, 期 24, 页码 4283-4292出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201505324
关键词
carrier dynamics; electronic impurities; organic-inorganic perovskite; photovoltaic
类别
资金
- Los Alamos National Laboratory LDRD program
- INCa-Canceropole GSO
Hybrid organic-inorganic perovskites have attracted considerable attention after promising developments in energy harvesting and other optoelectronic applications. However, further optimization will require a deeper understanding of the intrinsic photophysics of materials with relevant structural characteristics. Here, the dynamics of photoexcited charge carriers in large-area grain organic-inorganic perovskite thin films is investigated via confocal time-resolved photoluminescence spectroscopy. It is found that the bimolecular recombination of free charges is the dominant decay mechanism at excitation densities relevant for photovoltaic applications. Bimolecular coefficients are found to be on the order of 10(-9) cm(3) s(-1), comparable to typical direct-gap semiconductors, yet significantly smaller than theoretically expected. It is also demonstrated that there is no degradation in carrier transport in these thin films due to electronic impurities. Suppressed electron-hole recombination and transport that is not limited by deep level defects provide a microscopic model for the superior performance of large-area grain hybrid perovskites for photovoltaic applications.
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