Twist angle-dependent conductivities across MoS₂/graphene heterojunctions.

ABSTRACT: Van der Waals heterostructures stacked from different two-dimensional materials offer a unique platform for addressing many fundamental physics and construction of advanced devices. Twist angle between the two individual layers plays a crucial role in tuning the heterostructure properties. Here we report the experimental investigation of the twist angle-dependent conductivities in MoS₂/graphene van der Waals heterojunctions. We found that the vertical conductivity of the heterojunction can be tuned by ?5 times under different twist configurations, and the highest/lowest conductivity occurs at a twist angle of 0°/30°. Density functional theory simulations suggest that this conductivity change originates from the transmission coefficient difference in the heterojunctions with different twist angles. Our work provides a guidance in using the MoS₂/graphene heterojunction for electronics, especially on reducing the contact resistance in MoS₂ devices as well as other TMDCs devices contacted by graphene.

SUBMITTER: Liao M 

PROVIDER: S-EPMC6172227 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature