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Research Article

Robust transport of charge carriers in in-plane 1Tʹ-2H MoTe2 homojunctions with ohmic contact

Donglin Lu§, Zhenqing Li§, Congsheng Xu, Siwei Luo, Chaoyu He, Jun Li, Gang Guo, Guolin Hao, Xiang Qi( ), Jianxin Zhong( )
Hunan Key Laboratory for Micro-Nano Energy Materials and Devices, Laboratory for Quantum Engineering and Micro-Nano Energy Technology, and School of Physics and Optoelectronics, Xiangtan University, Hunan 411105, China
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Abstract

Metal-semiconductor ohmic contacts are required to reduce the energy dissipation for two-dimensional (2D) electronic devices, and phase engineering of 2D transition-metal dichalcogenides (TMDCs) is a promising approach for building ohmic contacts. Here, 2D in-plane 1T′-2H MoTe2 homojunctions were prepared by direct epitaxy via vapor deposition. The interface properties of in-plane 1T′-2H MoTe2 homojunction were investigated in detail by combining experiments, calculations and theories. The ohmic contact properties of 1T′-2H MoTe2 homojunction were proved according to Kelvin force probe microscopy and density functional theory calculations. The charge carriers robust transport in in-plane 1T′-2H MoTe2 homojunction without Fermi-level pinning can be well described by Poisson equation and band alignment. These results indicate that phase engineering of 2D TMDCs is promising to construct ohmic contacts for device applications.

Keywords

1T′-2H MoTe2 homojunctionohmic contactsurface potentialbuilt-in potential

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Nano Research
Volume 14 Issue 5,
May 2021
Pages 1311-1318
DOI: 10.1007/s12274-020-3155-4
Cite this article:
Lu D, Li Z, Xu C, et al. Robust transport of charge carriers in in-plane 1Tʹ-2H MoTe2 homojunctions with ohmic contact. Nano Research, 2021, 14(5): 1311-1318. https://doi.org/10.1007/s12274-020-3155-4
Topics:
Density functional theoryMolybdenum compoundsScanning probe microscopySemiconductor devices Transition metals

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Received: 30 July 2020
Revised: 14 September 2020
Accepted: 30 September 2020
Published: 05 January 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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