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Nano Research 2022, 15(3): 2689-2696 https://doi.org/10.1007/s12274-021-3790-4
Research Article | Issue | Published: 16 September 2021

Binary-ternary transition metal chalcogenides interlayer coupling in van der Waals type-II heterostructure for visible-infrared photodetector with efficient suppression dark currents

Show Author's Information Guoliang Xu1,  Danmin Liu1( ),  Songyu Li2,  Yi Wu1,  Zhenlu Zhang3,  Shaobo Wang1,  Zikun Huang1,  Yongzhe Zhang4( )
Key Laboratory of Advanced Functional Materials, Ministry of Education, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China
School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100083, China
School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China
Key Laboratory of Optoelectronics Technology, Ministry of Education, Faculty of Information Technology, Beijing University of Technology, Beijing 100124, China
Keywords:
MoS2, heterostructure, CrPS4, interlayer transition, visible-infrared photodetector, type-II band alignment
Topics:
Semiconductor devices
Cite this article:
Xu G, Liu D, Li S, et al. Binary-ternary transition metal chalcogenides interlayer coupling in van der Waals type-II heterostructure for visible-infrared photodetector with efficient suppression dark currents. Nano Research, 2022, 15(3): 2689-2696. https://doi.org/10.1007/s12274-021-3790-4
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Abstract Full text About this article

Ternary two-dimentional (2D) materials exhibit diverse physical properties depending on their composition, structure, and thickness. Through forming heterostructures with other binary materials that show similar structure, there can be numerous potential applications of these ternary 2D materials. In this work, we reported the structure of few-layer CrPS4 by X-ray diffraction, transmission electron microscope, and electron-density distribution calculation. We also demonstrated a new application of the CrPS4/MoS2 heterobilayer: visible-infrared photodetectors with type-II staggered band alignment at room temperature. The response of the heterostructure to infrared light results from a strong interlayer coupling that reduces the energy interval in the junction area. Since the intrinsic bandgap of individual components determines wavelengths, the decrease in energy interval allows better detection of light that has a longer wavelength. We used photoluminescence (PL) spectroscopy, Kelvin probe force microscopy (KPFM) under illumination, and electrical transport measurements to verify the photoinduced charge separation between the CrPS4/MoS2 heterostructures. At forward bias, the device functioned as a highly sensitive photodetector, as the wavelength-dependent photocurrent measurement achieved the observation of optical excitation from 532 to 1,450 nm wavelength. Moreover, the photocurrent caused by interlayer exciton reached around 1.2 nA at 1,095 nm wavelength. Our demonstration of the strong interlayer coupling in the CrPS4/MoS2 heterostructure may further the understanding of the essential physics behind binary-ternary transition metal chalcogenides heterostructure and pave a way for their potential applications in visible-infrared devices.


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Binary-ternary transition metal chalcogenides interlayer coupling in van der Waals type-II heterostructure for visible-infrared photodetector with efficient suppression dark currents

Show Author's information Guoliang Xu1, Danmin Liu1( ), Songyu Li2, Yi Wu1, Zhenlu Zhang3, Shaobo Wang1, Zikun Huang1, Yongzhe Zhang4( )
Key Laboratory of Advanced Functional Materials, Ministry of Education, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China
School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100083, China
School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China
Key Laboratory of Optoelectronics Technology, Ministry of Education, Faculty of Information Technology, Beijing University of Technology, Beijing 100124, China

Abstract

Ternary two-dimentional (2D) materials exhibit diverse physical properties depending on their composition, structure, and thickness. Through forming heterostructures with other binary materials that show similar structure, there can be numerous potential applications of these ternary 2D materials. In this work, we reported the structure of few-layer CrPS4 by X-ray diffraction, transmission electron microscope, and electron-density distribution calculation. We also demonstrated a new application of the CrPS4/MoS2 heterobilayer: visible-infrared photodetectors with type-II staggered band alignment at room temperature. The response of the heterostructure to infrared light results from a strong interlayer coupling that reduces the energy interval in the junction area. Since the intrinsic bandgap of individual components determines wavelengths, the decrease in energy interval allows better detection of light that has a longer wavelength. We used photoluminescence (PL) spectroscopy, Kelvin probe force microscopy (KPFM) under illumination, and electrical transport measurements to verify the photoinduced charge separation between the CrPS4/MoS2 heterostructures. At forward bias, the device functioned as a highly sensitive photodetector, as the wavelength-dependent photocurrent measurement achieved the observation of optical excitation from 532 to 1,450 nm wavelength. Moreover, the photocurrent caused by interlayer exciton reached around 1.2 nA at 1,095 nm wavelength. Our demonstration of the strong interlayer coupling in the CrPS4/MoS2 heterostructure may further the understanding of the essential physics behind binary-ternary transition metal chalcogenides heterostructure and pave a way for their potential applications in visible-infrared devices.

Keywords: MoS2, heterostructure, CrPS4, interlayer transition, visible-infrared photodetector, type-II band alignment

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Publication history
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Acknowledgements

Publication history

Received: 04 May 2021
Revised: 14 July 2021
Accepted: 03 August 2021
Published: 16 September 2021
Issue date: March 2022

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021

Acknowledgements

Acknowledgement

The authors would like to appreciate the very extensive grammar and content editing by and helpful discussions with Ziwei Zhang. This work was financially supported by the National Natural Science Foundation of China (No. NSFC 51972006).

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