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Reconfigurable WSe2Schottky heterojunctions for logic rectifiers and ultrafast photodetectors

التفاصيل البيبلوغرافية
العنوان: Reconfigurable WSe2Schottky heterojunctions for logic rectifiers and ultrafast photodetectors
المؤلفون: Huang, Jianming, Shu, Kaixiang, Bu, Nabuqi, Yan, Yong, Zheng, Tao, Yang, Mengmeng, Zheng, Zhaoqiang, Huo, Nengjie, Li, Jingbo, Gao, Wei
المصدر: Science China Materials; December 2023, Vol. 66 Issue: 12 p4711-4722, 12p
مستخلص: Van der Waals heterojunction-based self-powered photodetectors (SPPDs) based on two-dimensional materials play an important role in the fields of logic optoelectronics and intelligent image sensors. Herein, we fabricated a PtSe2/WSe2/Au asymmetric Schottky photodiode with a bottom-contact structure viamechanical exfoliation and dry transfer. Owing to the merits of gate-tunable Schottky barrier height, avoidance of the Fermi pinning effect of Au/WSe2, high conductivity of semi-metallic PtSe2, and excellent interlayer coupling effect between PtSe2and WSe2, the diode features polar reconfiguration which induces gate-tunable positive and negative rectifying behavior with a rectification ratio ranging from 10−2to 104, verifying the potential as a half-wave logic rectifier. In addition, the self-powered device exhibits a maximum photoresponsivity of 316 mA W−1, a Ilight/Idarkratio of 105, a photoelectric conversion efficiency of 4.62%, and a fast response speed. The scanning photocurrent mapping reveals that the photocurrent is primarily distributed at the edge of the Au/WSe2interface, indicating that it is an asymmetric Schottky photodiode. Finally, a high-resolution visible-light single-pixel imaging measurement is achieved. This study offers a straightforward effective approach for producing high-performance half-wave rectifiers, ultrafast SPPDs, and high-resolution image sensors.
قاعدة البيانات: Supplemental Index
الوصف
تدمد:20958226
21994501
DOI:10.1007/s40843-023-2636-7