期刊
ADVANCED MATERIALS
卷 32, 期 28, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202001998
关键词
flexible photodetectors; long-term stability; microwires; organic-inorganic hybrid perovskites
类别
资金
- National Key Research and Development Program of China
- National Natural Science Foundation of China (NSFC) [2017YFB1104300, 61435005, 51335008, 61590930, 61875072, 21903035]
Compared with thin-film morphology, 1D perovskite structures such as micro/nanowires with fewer grain boundaries and lower defect density are very suitable for high-performance photodetectors with higher stability. Although the stability of perovskite microwire-based photodetectors has been substantially enhanced in comparison with that of photodetectors based on thin-film morphology, practical applications require further improvements to the stability before implementation. In this study, a template-assisted method is developed to prepare methylammonium lead bromide (MAPbBr(3)) micro/nanowire structures, which are encapsulated in situ by a protective hydrophobic molecular layer. The combination of the protective layer, high crystalline quality, and highly ordered microstructures significantly improve the stability of the MAPbBr(3) single-crystal microwire arrays. Consequently, these MAPbBr(3) single-crystal microwire-array-based photodetectors exhibit significant long-term stability, maintaining 96% of the initial photocurrent after 1 year without further encapsulation. The lifetime of such photodetectors is hence approximately four times longer than that of the most stable previously reported perovskite micro/nanowire-based photodetector; this is thought to be the most stable perovskite photodetector reported thus far. Furthermore, this work should contribute further toward the realization of perovskite 1D structures with long-term stability.
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