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

• Published in: Advanced optical materials 2023-09, Vol.11 (17), p.n/a
• Main Authors: He, Xu, Zhang, Ling, Hong, Wenting, Wang, Bicheng, Sun, Fapeng, Hong, Zhaoan, Cai, Qian, Sun, Zhihua, Liu, Wei
• Format: Article
• Language: English
• Subjects: Broadband; Heterojunctions; Light; Materials science; Optics; photodetectors; Photometers; Power sources; self‐powered; sensitivity
• ISSN: 2195-1071; 2195-1071
• DOI: 10.1002/adom.202300319

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‐WSe2 van der Waals heterojunction with a distinct rectification ratio exceeding 104, 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/WSe2 heterojunction displayed a fast response speed of 18 µs and a broadband detection capability from 405 to 1550 nm. Furthermore, the Te/WSe2 heterojunction demonstrated a competitive self‐powered photodetector, exhibiting a light on/off ratio above 5 × 104, a photovoltaic responsivity of 196 mA W−1, and a photovoltaic detectivity of 7.5 × 1011 Jones. This study highlights the promising potential of Te/WSe2 vdWH for ultrasensitive self‐powered photodetection applications. A competitive self‐powered photodetector based on Te/WSe2 vdWH with a a fast response speed of 18 µs, a light on/off ratio above 5 × 104, and a photovoltaic detectivity of 7.5 × 1011 Jones under zero bias and 405 nm light illumination has been constructed.