Interlayer charge transfer in supported and suspended MoS2/Graphene/MoS2 vertical heterostructures.
Ana K Rocha RobledoMario Flores SalazarBárbara A Muñiz MartínezÁngel A Torres-RosalesHéctor F Lara-AlfaroOsvaldo Del Pozo-ZamudioEdgar A Cerda-MéndezSergio J Jiménez SandovalAndres De Luna BugalloPublished in: PloS one (2023)
In this letter, we report on the optical and structural properties of supported and suspended MoS2/Graphene/MoS2 vertical heterostructures using Raman and photoluminescence (PL) spectroscopies. Vertical heterostructures (VH) are formed by multiple wet transfers on micro-sized holes in SiO2/Si substrates, resulting in VH with different configurations. The strong interlayer coupling is confirmed by Raman spectroscopy. Additionally, we observe an enhancement of the PL emission in the three-layer VH (either support or suspended) compared with bare MoS2 or MoS2/Graphene. This suggests the formation of a spatial type-II band alignment assisted by the graphene layer and thus, the operation of the VH as a n++/metal/n junction.