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High‐Performance Planar Field‐Emission Photodetector of Monolayer Tungsten Disulfide with Microtips by Yan Tian; Xiangjun Zeng; Yang Xing; Jun Chen; Shaozhi Deng; Juncong She; Fei Liu is a Engineering article available to read on EtoBox.

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## Abstract Monolayer tungsten disulfide (ML WS~2~) is believed as an ideal photosensitive material due to its small direct bandgap, large exciton/trion binding energy, high carrier mobility, and considerable quantum conversion efficiency. Compared with other photosensitive devices, planar field emission (FE)‐type photodetectors with a full‐plane structure should simultaneously have rapider switching speed and lower power consumption. In this work, ML WS~2~ microtips are fabricated by electron beam lithography (EBL) way and used to construct a planar FE‐type photodetector. By optimization design, ML WS~2~ with three microtips can exhibit the maximum current density as high as 52 A cm^−2^ (@300 V μm^−1^), and the largest photoresponsivity is up to 6.8 × 10^5^ A W^−1^ under green light irradiation, superior to that of many other ML transition metal dichalcogenide (TMDC) detectors. More interestingly, ML WS~2~ devices with microtips can effectively solve the contradictory problem between large photoresponsivity and rapid switching speed. The excellent photoresponse performances of ML WS~2~ with microtips should be attributed to their high carrier mobility, sharp emission edge, ultrah

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Author

Yan Tian; Xiangjun Zeng; Yang Xing; Jun Chen; Shaozhi Deng; Juncong She; Fei Liu

Publisher

Wiley

Published

2023

Field

Engineering (Physical Sciences)