Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/79943
Title: Ultrafast, self-driven, and air-stable photodetectors based on multilayer PtSe2/perovskite heterojunctions
Authors: Zhang, ZX
Zeng, LH 
Tong, XW
Gao, Y
Xie, C
Tsang, YH 
Luo, LB
Wu, YC
Issue Date: 2018
Publisher: American Chemical Society
Source: Journal of physical chemistry letters, 15 Mar. 2018, v. 9, no. 6, p. 1185-1194 How to cite?
Journal: Journal of physical chemistry letters 
Abstract: We report on the large-scale synthesis of polycrystalline multilayer PtSe2 film with typical semimetallic characteristics. With the availability of the large-area film, we constructed a heterojunction composed of multilayer PtSe2 and Cs-doped FAPbI(3), which can function as a self-driven photodetector in a broadband wavelength from the ultraviolet to the near-infrared region. Further photoresponse analysis revealed that the heterojunction device showed outstanding photosensitive characteristics with a large I-light/I-dark ratio of 5.7 x 10(3), high responsivity of 117.7 mA W-1, and decent specific detectivity of 2.91 x 10(12) Jones at zero bias. More importantly, the rise/fall times were estimated to be 78/60 ns, rendering our device the fastest device among perovskite-2D photodetectors reported to date. In addition, it was also observed that the PtSe2/perovskite photodetector can almost retain its photoresponse properties after storage in ambient conditions for 3 weeks. This study suggests the potential of the present PtSe2/perovskite heterojunction for future air-stable ultrafast photodetecting applications.
URI: http://hdl.handle.net/10397/79943
EISSN: 1948-7185
DOI: 10.1021/acs.jpclett.8b00266
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