18September2019

Nano-Micro Letters

MoS2-Based Photodetectors Powered by Asymmetric Contact Structure with Large Work Function Difference

Zhe Kang1, Yongfa Cheng1, Zhi Zheng1, Feng Cheng1, Ziyu Chen1, Luying Li1, Xinyu Tan2, *, Lun Xiong3, Tianyou Zhai1, Yihua Gao1, 3, *

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Nano-Micro Lett. (2019) 11: 34

First Online: 16 April 2019 (Article)

DOI:10.1007/s40820-019-0262-4

*Corresponding author. E-mail: gaoyihua@hust.edu.cn (Yihua Gao); tanxin@ctgu.edu.cn (Xinyu Tan)

 

Abstract

 


Toc

Self-powered MoS2-based devices are widely used in the detection and sensing fields. Asymmetric metal contact structures provide an effective way to obtain self-powered devices. Identifying two stable metallic electrode materials with large work function differences is the key to obtain highly efficient structures based on asymmetric metal contacts. However, common metal electrode materials have high work functions, making it difficult to form an asymmetric structure with a large work function difference between the contacts. Herein, a low work function (3.8 eV) Mo2C material without surface terminations (such as -F, -O, and -OH) was obtained by chemical vapor deposition (CVD). The large work function difference between Mo2C and Au allowed us to synthesize an efficient Mo2C/MoS2/Au photodetector with asymmetric metal contact structure, which enables light detection without external electric power. We believe that this novel device provides a new direction for the design of miniature self-powered photodetectors. These results also highlight the great potential of ultrathin Mo2C prepared by CVD in heterojunction device applications.


 

Keywords

Mo2C; MoS2; Chemical vapor deposition; Asymmetric metal contacts; Photodetector

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