Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 6, Issue 25, Pages 6739-6746Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc02093k
Keywords
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Funding
- Natural Science Foundation of China (NSFC) [61604122, 51572216, 61774124]
- China Postdoctoral Science Foundation [2017M613139]
- 111 Program [B14040]
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The past few years have witnessed the rapid development of all-inorganic metal halide perovskites in optoelectronics. However, the solution-processed perovskite nanocrystal film suffers from low carrier extraction and transport efficiencies because of a large number of grain boundaries. Here, we demonstrate that an enhanced photoresponse is obtained by constructing a perovskite/hole-conducting layer heterostructure photoconductor, resulting from the interfacial charge transfer from perovskite to conducting layer. Furthermore, we develop a trap-assisted charge transfer mechanism to explain the larger photocurrent of the CuSCN heterostructure photoconductor than that of the NiO heterostructure. A saturated photocurrent of 40 A and a responsivity of 11 A W-1 at 1 V are obtained for the flexible CsPbBr3 nanosheet/CuSCN heterostructure. Excellent folding stability and long-term air-stability highlight the promising flexible photodetector applications.
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