期刊
NANOTECHNOLOGY
卷 31, 期 25, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/ab7de7
关键词
self-powered photodetector; trilayer heterojunction; CdS nanorods (NRs) layer; high-performance; specific detectivity; On; Off current ratio; gradient energy alignment
资金
- project of State Key Laboratory of Transducer Technology [SKT1404]
- project of the Key Laboratory of Photoelectronic Imaging Technology and System [2017OEIOF02]
- Beijing Institute of Technology, Ministry of Education of China
- project of the Key R & D projects of the Ministry of Science and Technology [SQ2019YFB220038]
Heterostructures composed of nano-/micro-junctions, combining the excellent photon harvesting properties of nano-systems and the ultrafast carrier transfer of micro-systems, have a promising role in high-performance photodetectors. In this paper, a highly-sensitive trilayer self-powered perovskite-based photodetector ITO/ZnO (70 nm)/CdS (150 nm)/CsPbBr3 (200 nm)/Au, in which the CdS nanorods (NRs) layer is sandwiched between a ZnO/CsPbBr3 interface to reduce the interfacial charge carriers' recombination and the charge transport resistance, is presented. Due to the strong built-in potential and the internal driving electric-field, an ultra-high On/Off current ratio of 10(6) with a responsivity of 86 mA W-1 and a specific detectivity of 6.2 x 10(11) Jones was obtained at zero bias under 85 mu W cm(-2) 405 nm illumination and its rise/decay time at zero bias is 0.3/0.25 s. Therefore, the enhanced device performance strongly suggests the great potential of such a trilayer heterojunction device for use in high-performance perovskite photodetectors.
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