Publications by authors named "Junning Mei"
Enhanced Photobolometric Effect in an All-Semimetal van der Waals Heterostructure.
ACS Appl Mater Interfaces
December 2024
Article Synopsis
- - The study explores the use of van der Waals semimetallic materials, particularly TiS and WTe, for creating better photodetecting devices that can operate across a wide range of frequencies, from visible light to terahertz.
- - A significant challenge faced by these two-dimensional semimetals is their high dark current and low temperature coefficient of conductance, which can hinder performance, but this study presents a heterostructure solution to improve these issues.
- - The TiS-WTe heterostructure shows enhanced photobolometric effects at low temperatures and maintains a good signal-to-noise ratio even at room temperature, suggesting potential advancements in thin-film optoelectronic device technology.
Leveraging its ultrahigh carrier mobility, zero-bandgap linear dispersion, and extremely short response time, graphene exhibits remarkable potential in ultrafast broad-band photodetection. Nonetheless, the inherently low responsivity of graphene photodetectors, due to the low photogenerated carrier density, significantly impedes the development of practical devices. In this study, we present an improved photoresponse within a graphene-hexagonal boron nitride-graphene vertical tunnel junction device, where the crystallographic orientation of the two graphene electrodes is aligned.
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