期刊
APL MATERIALS
卷 7, 期 4, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.5086125
关键词
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资金
- Bavarian State Ministry of Science, Research and the Arts
- Federal Ministry of Education
- German Research Foundation (DFG)
- German Research Foundation DFG [GRK1640]
- China Scholarship Council
- Colombian Science, Technology and Innovation Fund-General Royalties System (Fondo CTeI-Sistema General de Regalias) [BPIN 2013000100007]
- CIBioFi
Organolead halide perovskite solar cells (PSCs) have generated extensive attention recently with power conversion efficiency (PCE) exceeding 23%. However, these PSCs exhibit photoinduced instability in the course of their current-voltage measurements. In this work, we study the light-induced behavior in CH3NH3PbI3-xClx films in situ, by employing wide-field photoluminescence (PL) microscopy to obtain both the spatially and temporally resolved PL images simultaneously. Along with the increase in the PL intensity under continuous illumination, some areas render PL inactive. By characterizing the excitation energy dependent long-time PL decay behavior, we suggest that the PL quenching can be ascribed to a localized accumulation of iodide ions driven by the optical field. This ion localization leads to an enhancement of non-radiative recombination. The appearance of the PL inactive areas in the perovskite film impedes its photovoltaic device performance approaching the theoretical maximum PCE. Therefore, the herein presented real-time investigation of the light soaking of perovskite films is a versatile and adaptable method providing more details to improve the performance of PSCs. (C) 2019 Author(s).
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