Optoelectronic properties of graphene-MoS₂ hybrid

Abstract

Ultra-thin flakes of layered materials have recently been attracting widespread research interest due to their exotic properties. In this work, we study the optoelectronic response of a hybrid of two such materials – graphene and MoS₂. Our devices consist of mechanically exfoliated graphene flakes transferred on top of similarly exfoliated MoS₂. The electrical response of the hybrid is studied in the presence of white light. We show that the four-point resistance of graphene is modulated in the presence of light. This effect is observed to be a strong function of gate voltage. We have also extended our studies to CVD (Chemical Vapor Deposition) - grown graphene transferred onto MoS₂ which show qualitatively similar features, thereby attesting to the scalability of the device architecture.