Abstract:
Two-dimensional layered materials have emerged prominently in the past decade, largely being
investigated fundamentally and practically. Their unique layered structure and atomic-scale
thickness make them attractive with exclusive electrical and optical properties compared to their
bulk counterparts. Molybdenum disulfide (MoS2) is the most widely studied material in the
family of transition metal dichalcogenides. The direct and variable bandgap, high carrier
mobility, thermal and chemical stability makes it an attractive choice for next-generation
photodetector applications. MoS2 heterojunction-based photodetectors offer ultrafast charge
transfer and broadband photoresponse, adding more functionality beyond their individual
counterparts. Enormous efforts have been devoted to adopting a new strategy that can improve
photodetector performance in terms of responsivity and response time. This review briefly
discusses the photo-induced current mechanism and performance parameters along with some
important aspects to realize better device performance. Here, we critically review the current
status and progress made towards MoS2-based photodetectors, followed by a discussion on
open challenges and opportunities in their future application.
