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Flexible self-powered photoelectrochemical-type photodetector based on 2D WS2-graphene heterojunction
FlatChem  (IF5.227),  Pub Date : 2021-01-01, DOI: 10.1016/j.flatc.2020.100215
Xiaohui Ren, Bo Wang, Zongyu Huang, Hui Qiao, Chenguang Duan, Yang Zhou, Jianxin Zhong, Ziyu Wang, Xiang Qi

Abstract Flexible devices have attracted enormous attention in recent years due to the rapid development of portable electronic devices. As a neoteric photodetector, superior performances has already been observed in photoelectrochemical (PEC)-type photodetector. However, the liquid electrolyte inside is not suitable for flexible device fabrication due to the underlying leakage problem. Hence, in this paper, we report a novel flexible self-powered PEC-type photodetector based on 2D Tungsten sulfide (WS2)-graphene heterojunction. By using solid electrolyte as electrons transferring medium, the photodetector presents excellent self-powered capability. Under the condition of illumination intensity of 30 mW cm-2 at the bias voltage of 0 V, the photocurrent can reach 1.4 μA cm-2, while the time response of rise is 1.2 s and the decay time is about 0.9 s. In addition, as the photodetector is made of flexible indium-tin oxide (ITO) substrate, it can work and keep stable under the bending condition. These results provide a route for the preparation of a new flexible self-powered photodetector with simple fabrication processes and low cost.