Abstract
In this talk, we will demonstrate a heterostructure that consists of two graphene layers, a bulk BP and a 18 nm-thick hBN. The maximum responsivity reaches 1.43 A/W (corresponding to EQE of 52%) at wavelength of 3.4 μm, and the overall efficiency, from visible to MIR, can exceed 20%. Additionally, the performed photodetector can exhibit ultrafast rise and fall times (< 2 ns), and the switching behavior of photodetector is highly reproducible as confirmed by the eye diagram measurement with the data rate at 250 Mbits/s. Finally, we examine the capability of MIR imaging of our detector. The acquired images exhibit high sharpness and contrast even under low light intensity illumination and fast scanning conditions.