基于AsP/MoS2异质结的偏振光电探测器

线偏振光的探测能力是评价偏振光电探测器件的重要指标。黑砷磷(AsP)是一种较为稳定的平面内各向异性材料,由于其面内结构各向异性,其对线偏振光较为敏感,在偏振探测领域有着重要的应用潜力。本文介绍了一种基于AsP/MoS2的高度偏振敏感光电探测器。由于AsP各向异性的光吸收、MoS2有效的载流子收集和输运能力以及范德华异质结对暗电流的抑制作用,该光电探测器实现了大于300的电流开关比,0.27 A/W的电流光响应度以及2×10^10 Jones的比探测率。更重要的是,此类光电探测器在638 nm波段实现了高达3.06二向色性比的偏振特性。这些实验结果表明AsP/MoS2异质结构在偏振光电探测领域有着广阔的应用前景。

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

The ability to detect linearly polarized light is an important index for evaluating polarized photoelectric 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 2×10¹⁰ 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.