Abstract
Abstract
The type-II Weyl semimetal Td-WTe2 is one of the wonder materials for high-performance optoelectronic devices. We report the self-powered Td-WTe2 photodetectors and their bias-dependent photoresponse in the visible region (405, 520, 638 nm) driven by the bulk photovoltaic effect. The device shows the responsivity of 15.8 mAW−1 and detectivity of 5.2 × 109 Jones at 520 nm. Besides, the response time of the WTe2 photodetector shows the strong bias-voltage dependent property. This work offers a physical reference for understanding the photoresponse process of Td-WTe2 photodetectors.
Funder
the Projects of Science and Technology Commission of Shanghai Municipality
the Natural Science Foundation of China
the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning