A High Performance Polarization Sensitive Photodetector Based on Remote Doped van der Waals Heterostructure

Abstract

Photodetector, which converts photon energy of light to the electrical signal, is widely applied to applications such as LiDAR, airline, terrain, astronomy fields which results in increasing demand of high performance photodetector. Two-dimensional (2D) material based photodetector has received more interest thanks to its novel optoelectronic properties such as high quantum efficiency at low thickness, broadband photodetection. However, 2D material has low light absorption properties, which is closely related to the single atomic thickness. Doping is widely applied to enhance photoresponsivity, but has a trade off with photoresponse time due to charged impurity scattering by introduced dopants. Here, we applied remote modulation doping method to ReS2 photodetector by simple insertion of monolayer hexagonal boron nitride between doping solution and channel material. With remote modulation doping, we achieves simultaneous enhancement of photoresponsivity and temporal response time. In addition, with intrinsically anisotropic crystal structure of ReS2, polarization sensitive photoresponse, which provides efficient target recognition, enhanced display and imaging, is confirmed with ReS2 photodetector and also demonstrated that doping does not have negative effect to the polarization sensitivity. The proposed high performance and polarization sensitive photodetection technology promotes a new way for two-dimensional material based optoelectronic devices.