Flexible and highly responsive photodetectors based on heterostructures of MoS ₂ and all-carbon transistors

Abstract

Heterostructures of graphene and transition-metal dichalcogenides (TMDCs) are promising candidates for high-performance flexible photodetectors because of their high photoresponsivity and detectivity. However, the mechanical stability of current flexible photodetectors is limited, due to a mechanical mismatch between their two-dimensional channel materials and metallic contacts. Herein, we develop a type of mechanically stable, highly responsive, and flexible photodetector by integrating MoS₂and all-carbon transistors. By combining the high mobility of graphene with the strong light-matter interactions of MoS₂, our heterostructure photodetector exhibits a greatly improved photoresponse performance, compared with individual graphene or MoS₂photodetectors. In addition, the mechanical properties of the all-carbon electrodes are a good match for those of the active two-dimensional channels, resulting in greatly improved electrical stability of the heterostructure photodetector under mechanical deformation. These capabilities make our heterostructure photodetector a promising candidate for flexible photodetection and photoimaging applications.