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Research Article

Enhancing stability by tuning element ratio in 2D transition metal chalcogenides

Zhenjia Zhou1,§, Tao Xu2,§, Chenxi Zhang1, Shisheng Li3, Jie Xu1, Litao Sun2(), Libo Gao1()
National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, China
International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 3050044, Japan

§ Zhenjia Zhou and Tao Xu contributed equally to this work.

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Abstract

Two-dimensional (2D) transition metal chalcogenides (TMCs) are known to be susceptible to the atmosphere, which greatly obscures the intrinsic physical and chemical properties. The quantitative origin of the instability on the atomic scale has not been well investigated due to the lack of environmentally stable TMCs sample. Here, we find the stability of the grown TMCs is strongly relevant to their initial element ratios, and thus the stoichiometric bonded TMCs have favorable stability, benefitted from the TMCs with controllable chalcogenisation. In this study, the degree of structural degradation has been quantitatively defined by the reduced element ratio of chalcogen to metal through the time-dependent characterizations, and the non-stoichiometric ratios in TMCs reveal the atomic lattices with point defects like additive bonds or vacancies inside. This study not only provides a potential view to fabricate environmentally stable TMCs based devices, but also will bring an effective feasibility of stacking stable vertical heterostructures.

Keywords

transition metal chalcogenidesstabilitypoint defectsstoichiometric ratiotwo-step vapor deposition

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Nano Research
Volume 14 Issue 6,
June 2021
Pages 1704-1710
DOI: 10.1007/s12274-020-3035-y
Cite this article:
Zhou Z, Xu T, Zhang C, et al. Enhancing stability by tuning element ratio in 2D transition metal chalcogenides. Nano Research, 2021, 14(6): 1704-1710. https://doi.org/10.1007/s12274-020-3035-y
Topics:
ChalcogenidesTransition metals
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