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Vol. 11 (2019)

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

https://doi.org/10.1007/s40820-019-0262-4
Zhe Kang
Center for Nanoscale Characterization and Devices (CNCD) Wuhan National Laboratory for Optoelectronics (WNLO) and School of Physics and School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), Luoyu Road 1037, Wuhan 430074, People’s Republic of China
Yongfa Cheng
Center for Nanoscale Characterization and Devices (CNCD) Wuhan National Laboratory for Optoelectronics (WNLO) and School of Physics and School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), Luoyu Road 1037, Wuhan 430074, People’s Republic of China
Zhi Zheng
Center for Nanoscale Characterization and Devices (CNCD) Wuhan National Laboratory for Optoelectronics (WNLO) and School of Physics and School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), Luoyu Road 1037, Wuhan 430074, People’s Republic of China
Feng Cheng
Center for Nanoscale Characterization and Devices (CNCD) Wuhan National Laboratory for Optoelectronics (WNLO) and School of Physics and School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), Luoyu Road 1037, Wuhan 430074, People’s Republic of China
Ziyu Chen
Center for Nanoscale Characterization and Devices (CNCD) Wuhan National Laboratory for Optoelectronics (WNLO) and School of Physics and School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), Luoyu Road 1037, Wuhan 430074, People’s Republic of China
Luying Li
Center for Nanoscale Characterization and Devices (CNCD) Wuhan National Laboratory for Optoelectronics (WNLO) and School of Physics and School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), Luoyu Road 1037, Wuhan 430074, People’s Republic of China
Xinyu Tan
College of Materials and Chemical Engineering, China Three Gorges University, Daxue Road 8, Yichang 443002, People’s Republic of China
Lun Xiong
Hubei Key Laboratory of Optical Information and Pattern Recognition, School of Optical Information and Energy Engineering, School of Mathematics and Physics, Wuhan Institute of Technology, Guanggu 1st Road 206, Wuhan 430205, People’s Republic of China
Tianyou Zhai
Center for Nanoscale Characterization and Devices (CNCD) Wuhan National Laboratory for Optoelectronics (WNLO) and School of Physics and School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), Luoyu Road 1037, Wuhan 430074, People’s Republic of China
Yihua Gao
Center for Nanoscale Characterization and Devices (CNCD) Wuhan National Laboratory for Optoelectronics (WNLO) and School of Physics and School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), Luoyu Road 1037, Wuhan 430074, People’s Republic of China

Corresponding Author: Yihua Gao

gaoyihua@hust.edu.cn

Nano-Micro Letters, Vol. 11 (2019), Article Number: 34

Abstract

Self-powered devices are widely used in the detection and sensing fields. Asymmetric metal contacts provide an effective way to obtain self-powered devices. Finding two stable metallic electrode materials with large work function differences is the key to obtain highly efficient asymmetric metal contacts structures. However, common metal electrode materials have similar and high work functions, making it difficult to form an asymmetric contacts structure with a large work function difference. Herein, Mo2C crystals with low work function (3.8 eV) was obtained by chemical vapor deposition (CVD) method. 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.


Highlights:


1 2D Mo2C was produced by a modified chemical vapor deposition method, and 2D Mo2C-Au was formed as an asymmetric contact structure with a large work function difference.
2 Mo2C/MoS2/Au photodetectors powered by asymmetric contact structure can work under self-powered condition with a responsivity of 10−1 mA W−1. The detection performance of the photodetectors can be stable for at least 110 days.

Keywords

Mo2C MoS2 Chemical vapor deposition Asymmetric metal contacts Photodetector
Kang, Zhe, Yongfa Cheng, Zhi Zheng, Feng Cheng, Ziyu Chen, Luying Li, Xinyu Tan, Lun Xiong, Tianyou Zhai, and Yihua Gao. 2019. “MoS2-Based Photodetectors Powered by Asymmetric Contact Structure With Large Work Function Difference”. Nano-Micro Letters 11 (April):34. https://doi.org/10.1007/s40820-019-0262-4.
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