Unusually efficient photocurrent extraction in monolayer van der Waals heterostructure by tunnelling through discretized barriers.

ABSTRACT: Two-dimensional layered transition-metal dichalcogenides have attracted considerable interest for their unique layer-number-dependent properties. In particular, vertical integration of these two-dimensional crystals to form van der Waals heterostructures can open up a new dimension for the design of functional electronic and optoelectronic devices. Here we report the layer-number-dependent photocurrent generation in graphene/MoS₂/graphene heterostructures by creating a device with two distinct regions containing one-layer and seven-layer MoS₂ to exclude other extrinsic factors. Photoresponse studies reveal that photoresponsivity in one-layer MoS₂ is surprisingly higher than that in seven-layer MoS₂ by seven times. Spectral-dependent studies furth

SUBMITTER: Yu WJ 

PROVIDER: S-EPMC5105192 | biostudies-literature | 2016 Nov

REPOSITORIES: biostudies-literature