Integrated bidirectional and polarization-sensitive photodetection in a ReSe2/graphene/WSe2 heterostructure

Abstract

Photodetectors exhibiting bidirectional photocurrent and polarization sensitivity hold significant promise for applications in polarized imaging and in-sensor computing. Integrating both bidirectional and polarization-sensitive functionalities is crucial for future intelligent optoelectronics, yet remains challenging, necessitating further exploration of underlying mechanisms and device designs. In this work, we design a photodetector based on a ReSe₂/graphene/WSe₂ heterostructure that integrates both bidirectional and polarization-sensitive characteristics. The bidirectional photocurrent, achieved by switching the sign of the gate voltage, offers potential for intelligent optical sensing applications. As a polarization-sensitive photodetector, the device achieves a polarization ratio (PR) value of 9 at 635 nm and 6 at 808 nm, which are competitive with state-of-the-art two-dimensional (2D) material-based polarized photodetectors. This work successfully demonstrates a bidirectional and polarization-sensitive photodetector, paving the way for advancements in polarimetric electronics and in-sensor computing.