Self-Powered Te/Wse_2 Van Der Waals Heterojunction Photodetectors With High Light On/Off Ratio And Fast Response

摘要

The development of a self-powered photodetector capable of functioningwithout an external power source has generated significant interest amongresearchers due to the growing demand for miniaturization and portability. Inthis study, a p-Te/n-WSe_2 van der Waals heterojunction with a distinctrectification ratio exceeding 10~4, an ultralow reverse current of 10~(?11) A, and alight 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 of18 μs and a broadband detection capability from 405 to 1550 nm.Furthermore, the Te/WSe_2 heterojunction demonstrated a competitiveself-powered photodetector, exhibiting a light on/off ratio above 5 × 10~4, aphotovoltaic 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 vdWHfor ultrasensitive self-powered photodetection applications.