期刊
ADVANCED MATERIALS
卷 29, 期 40, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201703758
关键词
CsPbBr3; optoelectronics; perovskites; photoluminescence; single crystals
类别
资金
- Ministry of Science and Technology of China [2017YFA0204800]
- National Natural Science Foundation of China [21533010, 21321091, 21525315, 91333116]
- DICP [DMTO201601]
- Science Challenging Program [JCKY2016212A501]
- Swedish Research Council
- KAW foundation
- Interreg Oresund-Kattegat-Skagerrak, European regional development fund
Low trap-state density, high carrier mobility, and efficient charge carrier collection are key parameters for photodetectors with high sensitivity and fast response time. This study demonstrates a simple solution growth method to prepare CsPbBr3 microcrystals (MCs) with low trap-state density. Time-dependent photoluminescence study with one-photon excitation (OPE) and two-photon excitation (TPE) indicates that CsPbBr3 MCs exhibit fast carrier diffusion with carrier mobility over 100 cm(2) V-1 S-1. Furthermore, CsPbBr3 MC-based photodetectors with high charge carriers' collection efficiency are fabricated. Such photodetectors show ultrahigh responsivity (R) up to 6 x 10(4) A W-1 with OPE and high R up to 6 A W-1 with TPE. The R for OPE is over one order of magnitude higher (the R for TPE is three orders of magnitude higher) than that of previously reported all-inorganic perovskite-based photodetectors. Moreover, the photodetectors exhibit fast response time of approximate to 1 ms, which corresponds to a gain approximate to 10(5) and a gain- bandwidth product of 10(8) Hz for OPE (a gain approximate to 10 (3) and a gain-bandwidth product of 10(6) Hz for TPE).
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