Broadband Photodetector Based on FePS<sub>3</sub>/WS<sub>2</sub> van der Waals Type II Heterostructure
Xinyu Cao, Shaohua Yan, Zhiteng Li, Zhenghui Fang, Lin Wang, Xiaofeng Liu, Zhengwei Chen, Hechang Lei, Xiao Zhang
Abstract
In order to understand broadband photodetectors from ultraviolet–visible (UV–vis) to the near-infrared range, one needs to find novel two-dimensional (2D) van der Waals (vdW) materials with broadband optoelectronic performance. Transition metal phosphorus sulfides (TMPSs) have been reported as a new type of vdW material with generally broadband and p-type conductivity. Here, we report a high-performance and broadband photodetector consist of p-type FePS 3 and n-type WS 2 with a working range of 405–785 nm. The maximum values of responsivity and specific detectivity are 32.5 mA/W and 1.73 × 10 12 jones at 405 nm and 2 V bias, which are better than those of its individual constituents and many other 2D vdW heterostructures. The high performance of the FePS 3 /WS 2 photodetector is attributed to the built-in electric field in the FePS 3 /WS 2 p–n heterostructure and type II band alignment. Present study demonstrates that the material family of TMPSs could be a promising platform for broadband photodetector applications.