High-performance Broadband Photodetector based on a WS2-QD/monolayer MoS2 0D/2D Mixed-dimensional Heterostructure

Abstract

Even though multiple reports are available on photodetectors, the problem that still remain unaddressed is the low photoresponsivity while trying to increase the range of detection. In this work, broadband (UV-visible) photodetector was demonstrated by integrating zero-dimensional (0D) WS2-QDs on two-dimensional (2D) monolayer MoS2. WS2-QDs are sensitive to UV light, and MoS2 is sensitive to visible light. The maximum responsivity of the fabricated WS2-QDs/MoS2 device was found to be ~ 392 A/W. In this work, not only the photodetection range but also photoresponsivity is improved, which is a major step in the design of next-generation 2D materials based optoelectronics.