A high-performance self-powered photodetector based on WSe2–graphene–MoTe2 van der Waals heterojunctions. Issue 24 (16th June 2022)

• Record Type: Journal Article
• Authors: Feng, Pu; He, Sixian; Zhao, Sixiang; Dang, Congcong; Li, Ming; Zhao, Liancheng; Lu, Hong-Liang; Gao, Liming
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 24(2022)
• Page Start: 9401
• Page End: 9406
• Publication Date: 2022-06-16
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2tc01441f
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : The introduction of a graphene interlayer contributes to an ultrafast and high-responsivity self-powered photodetector using a WSe2 –graphene–MoTe2 van der Waals heterojunction. Abstract : Self-powered photodetectors can detect light without an external power supply, which is critical for low-power applications and energy conservation. However, achieving high performance self-powered photodetectors remains a challenge. In this paper, we constructed a new WSe2 –graphene–MoTe2 van der Waals heterojunction-based self-powered photodetector. This self-powered device shows excellent photoresponse to 550 nm light (10 mW cm −2 ) with a responsivity of 40.84 mA W −1 and a detectivity of 1.21 × 10 11 Jones at zero bias. Moreover, it has an on/off ratio of 10 3 and a photoresponse time on the order of μs under a 520 nm laser (1 μW) at zero bias. We believe that the dual-Schottky junction heterojunction enables a promising approach for designing self-powered photodetectors.