Self‐Powered Te/Wse2 Van Der Waals Heterojunction Photodetectors With High Light On/Off Ratio And Fast Response

Abstract The development of a self‐powered photodetector capable of functioning without an external power source has generated significant interest among researchers due to the growing demand for miniaturization and portability. In this study, a p‐Te/n‐WSe 2 van der Waals heterojunction with a distinct rectification ratio exceeding 10 4 , an ultralow reverse current of 10 −11 A, and a light on/off ratio of up to 5657 under 405 nm light illumination is fabricated. Additionally, the Te/WSe 2 heterojunction displayed a fast response speed of 18 µs and a broadband detection capability from 405 to 1550 nm. Furthermore, the Te/WSe 2 heterojunction demonstrated a competitive self‐powered photodetector, exhibiting a light on/off ratio above 5 × 10 4 , a photovoltaic responsivity of 196 mA W −1 , and a photovoltaic detectivity of 7.5 × 10 11 Jones. This study highlights the promising potential of Te/WSe 2 vdWH for ultrasensitive self‐powered photodetection applications.