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

Zhe Kang; Yongfa Cheng; Zhi Zheng; Feng Cheng; Ziyu Chen; Luying Li; Xinyu Tan; Lun Xiong; Tianyou Zhai; Yihua Gao

doi:10.1007/s40820-019-0262-4

Nano-Micro Letters (Apr 2019)

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

Zhe Kang,
Yongfa Cheng,
Zhi Zheng,
Feng Cheng,
Ziyu Chen,
Luying Li,
Xinyu Tan,
Lun Xiong,
Tianyou Zhai,
Yihua Gao

Affiliations

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)
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)
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)
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)
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)
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)
Xinyu Tan: College of Materials and Chemical Engineering, China Three Gorges University
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
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)
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)

DOI: https://doi.org/10.1007/s40820-019-0262-4
Journal volume & issue: Vol. 11, no. 1
pp. 1 – 12

Abstract

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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.

Published in Nano-Micro Letters

ISSN: 2311-6706 (Print); 2150-5551 (Online)
Publisher: SpringerOpen
Country of publisher: Germany
LCC subjects: Technology
Website: http://www.springer.com/40820

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