基于各向异性二维SnSe的红外偏振光探测器研究

Infrared Polarization sensitive photodetector exhibit great application potential in civilian and military. The polarization sensitive photodetection based on black phosphorus and black phosphorus analogue have been studied due to their in-plane anisotropic. But there are still lack of enough theoretical modeling and experiment results to study the properties of the polarization sensitive photodetector. In order to develop high performance polarization infrared photodetector, substantial research effort devoted to studying the materials synthesis, device fabrication and theoretical study. In this project, we will study the growth process of SnSe 2D materials to obtain SnSe with controlled thick and surface area. Then, we plan to fabricate photodetector device based on the as-prepared SnSe 2D materials. Meanwhile, the physical mechanism of photo-induced carriers generation, separation and transmission in SnSe will be unraveled based on the angle-resolved polarized raman spectroscopy, angle resolved conductance measurement，polarization resolved absorption spectroscopy and near field optical microscope techniques. We are aiming to unravel the relationship of “materials-microstructure-optoelectronic property-device”. The success of this project will be beneficial for fabricating high performance polarization sensitive infrared photodetector based on isotropic 2D materials.

红外偏振光探测在军事、民用领域有非常重要的应用。目前基于黑磷和类黑磷等具有面内各向异性的二维材料的偏振光探测还处于起步阶段，理论研究和实验工作尚不完善。为了解决偏振光探测在材料制备、器件构建和理论机制方面面临的问题，开发高性能的红外偏振光探测器，本项目拟通过系统研究材料生长中各种参数，实现SnSe二维原子晶体可控制备，进而构建基于SnSe二维原子晶体的高性能红外偏振光探测器。基于偏振拉曼光谱、角分辨电导率、吸收光谱和近场光学显微镜分析测试，研究材料内部光电作用与转换机制、偏振光探测及光电特性，最终实现基于SnSe二维原子晶体的高灵敏度、高偏振比、高响应度红外偏振光探测器。

红外偏振光探测在军事、民用领域有非常重要的应用。本项目提出基于SnSe生长过程中的各种参数调控，实现SnSe二维原子晶体的可控制备，利用多种表征技术对SnSe的微结构特征、光物质相互作用进行了精细表征，进而构建基于SnSe的高性能红外偏振光探测器。本项目严格按照任务书中规定的研究内容和研究计划，就项目所涉及的研究任务和研究目标进行了系统研究。目前，项目进展严格按照任务书计划执行，研究成果基本符合预期目标，主要研究成果包括：.1. 实现了基于缺陷工程的硒化锡（SnSe）的光物质相互作用的高效调控。通过离子插层在SnSe晶格中实现了缺陷态调控，实现了光探测器关键技术参数的显著提升；.2. 利用机械剥离获得单晶SnSe纳米片，并构建了n-ReSe2/p-SnSe垂直异质结的光电探测器，实现了可见光到近红外波段的偏振光电探测.

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