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Van der Waals PdSe 2 /WS 2 Heterostructures for Robust High‐Performance Broadband Photodetection from Visible to Infrared Optical Communication Band
Author(s) -
Kang Xiaolin,
Lan Changyong,
Li Fangzhou,
Wang Wei,
Yip SenPo,
Meng You,
Wang Fei,
Lai Zhengxun,
Liu Chuntai,
Ho Johnny C
Publication year - 2021
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.202001991
Subject(s) - heterojunction , materials science , photodetection , optoelectronics , van der waals force , monolayer , visible spectrum , infrared , photodetector , nanotechnology , optics , physics , quantum mechanics , molecule
Due to excellent electrical and optoelectronic properties, 2D transition metal dichalcogenides and their van der Waals (vdW) heterostructures have attracted great attention for broadband optoelectronics. Here, an unreported vdW PdSe 2 /WS 2 heterostructure is developed for robust high‐performance broadband photodetection from visible to infrared optical communication band. These heterostructure devices are simply formed by direct selenization of Pd films pre‐deposited on the chemical vapor deposited monolayer WS 2 , followed by wet‐transfer onto device substrates with pre‐patterned electrodes. Importantly, the obtained heterostructure device exhibits an impressive broadband spectral photoresponse with response times less than 100 ms for different wavelength regions (532 to 1550 nm), where this performance is significantly better than that of pristine monolayer WS 2 devices. This performance enhancement is attributed to the type I band alignment of the heterostructure. Under illumination, both intralayer and interlayer excitations are involved to generate carriers in the relevant layer, enabling the broadband photoresponse. Photocarriers would then undergo charge separation in the depletion region with electrons transferred into the charge transport layer of WS 2 through the built‐in electric field, followed by the relaxation to valance band via interlayer or intralayer transition. All these findings can indicate the promising potential of vdW PdSe 2 /WS 2 heterostructures for next‐generation high‐performance optoelectronics.