Electron redistribution and energy transfer in graphene/MoS_2 heterostructure

摘要

In this letter, van der Waals heterostructures (vdWHs) assembled by molybdenum disulfide (MoS2) and graphene monolayers are used as an experimental prototype to study the interaction between two-dimensional (2D) semiconducting and semimetal materials. The electron redistribution and energy transfer in graphene/MoS2 vdWHs are demonstrated by the combination of electrical measurements (Dirac-point shift) and Raman analyses. In graphene, the linear dispersive Dirac fermions can resonate with various-frequency "photons," which "emit" from optically active MoS2 by the recombination of in-plane excitons. The experimental finding suggests that the photon-induced charge separation and accumulation might be in a low degree, thus affecting the performance of semiconductor/graphene-based 2D optoelectronic devices. Published under license by AIP Publishing.