Fabrication of Stacked MoS 2 Bilayer with Weak Interlayer Coupling by Reduced Graphene Oxide Spacer

Abstract

We fabricated the stacked bilayer molybdenum disulfide (MoS 2 ) by using reduced graphene oxide (rGO) as a spacer for increasing the optoelectronic properties of MoS 2 . The rGO can decrease the interlayer coupling between the stacked bilayer MoS 2 and retain the direct band gap property of MoS 2 . We observed a twofold enhancement of the photoluminescence intensity of the stacked MoS 2 bilayer. In the Raman scattering, we observed that the E 12g and A 1g modes of the stacked bilayer MoS 2 with rGO were further shifted compared to monolayer MoS 2 , which is due to the van der Waals (vdW) interaction and the strain effect between the MoS 2 and rGO layers. The findings of this study will expand the applicability of monolayer MoS 2 for high-performance optoelectronic devices by enhancing the optical properties using a vdW spacer.