A polarization-sensitive photodetector based on a AsP/MoS2 heterojunction

The ability to detect linearly polarized light is an important index for evaluating polarized photo-electric detectors. Black arsenic phosphorus (b-AsP) is a relatively stable anisotropic material, and is sensitive to linearly polarized light because of its anisotropy inside its planar structure. The material has important application value in polarization detection. This paper introduces a polarization-sensitive photodetector based on AsP/MoS2. Due to the anisotropic light absorption of AsP, effective carrier collection and strong carrier transport capacity of MoS2, as well as the suppression of dark current by a van der Waals heterojunction, the performance of the photodector shows relatively large on/off ratios. Moreover, the photodector has a current optical responsivity of 0.27 A/W and a detectivity of 2x10(10) Jones, and more importantly, achieves a dichroic ratio of up to 3.06 at 638 nm. These experimental results show that AsP/MoS2 heterostructures have broad application prospects in the field of polarized photoelectricity detection.