Graphene based heterostructures used for high performance broadband photodetectors

The intrinsic optical responsivity of pure graphene-based photodetectors is usually poor (∼10
⁻²
AW
⁻¹
) due to its relatively low absorption cross-section and fast recombination rate of photocarriers. This has led to the formation of heterostructures of graphene with other 2D materials to obtain enhanced performance in these hybrid structures. Here, we reported novel heterostructures based on graphene-perovskite, graphene-MoTe2, and graphene-black phosphorus (BP) and their application for broadband photodetectors. Our results show that the graphene-perovskite photodetector exhibits significantly enhanced photoresponsivity (97 AW
⁻¹
, visible light) than the pure perovskite photodetector. The graphene-MoTe2 heterostructure photodetector achieves a high responsivity of ∼970.82 AW
⁻¹
at 1064 nm and the graphene-BP heterostructure photodetector shows an ultrahigh responsivity of 3.3×10
^s
AW
⁻¹
at telecommunication band of 1550 nm wavelength. The high performance in broadband range demonstrated in these work pave the way for practical applications of 2D materials in remote sensing, biological imaging and environmental monitoring.