Journal
ACS APPLIED ELECTRONIC MATERIALS
Volume 5, Issue 7, Pages 3634-3640Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaelm.3c00366
Keywords
monolayer; tungsten disulfide; 2-dimensionalgrowth; CVD; high photosensitivity; photodetectors
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Future generation technologies require high efficiency photodetectors for ultrafast communication and machine vision. Monolayered two-dimensional semiconductor-based photodetectors have the potential to fulfill these requirements. In this paper, a WS2-based photodetector was fabricated with high sensitivity and low incident power density, demonstrating its capability to replace Si-photodetectors with superior performance parameters.
Future generation technologies demand high efficiencyphotodetectorsto enable sensing and switching devices for ultrafast communicationand machine vision. This requires direct-band gap materials with highphotosensitivity, high detectivity, and high quantum efficiency. Monolayeredtwo-dimensional-semiconductor-based photodetectors are the most promisingmaterials for such applications, although experimental realizationhas been limited due to the unavailability of a high-quality sample.In the current paper, we report about a WS2-based photodetectorhaving a sensitivity of 290 A W-1 upon 405 nm excitationand an incident power density as low as 0.06 mW/cm(2). Thefabricated device shows a detectivity of 52 x 10(14) with an external quantum efficiency of 89 x 10(3) %.The observed superior photoresponse parameters of the CVD-grown WS2-based photodetector as compared to Si-detectors establishits capability to replace the Si-photodetectors with monolayered ultrathindevice having superior performance parameters.
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