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Synthesizing 1T–1H Two-Phase Mo1–xWxS2 Monolayers by Chemical Vapor Deposition

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Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
§ Key Laboratory of Polar Materials and Devices, East China Normal University, Shanghai 200062, P. R. China
Institute of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8573, Japan
CREST, JST, 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan
Cite this: ACS Nano 2018, 12, 2, 1571–1579
Publication Date (Web):January 24, 2018
https://doi.org/10.1021/acsnano.7b08149
Copyright © 2018 American Chemical Society
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Abstract

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1T–1H metal–semiconductor interfaces in two-dimensional (2D) transition-metal dichalcogenides (TMDs) play a crucial role in utilizing the band gaps of TMDs for applications in electronic devices. Although the 1T–1H two-phase structure has been observed in exfoliated 2D nanosheets and chemically or physically treated TMDs, it cannot in principle be achieved in large-scale TMD monolayers grown by chemical vapor deposition (CVD), which is a fabrication method for electronic device applications, because of the metastable nature of the 1T phase. In this study we report CVD growth of 1T–1H two phase TMD monolayers by controlling thermal strains and alloy compositions. It was found that in-plane thermal strains arising from the difference in thermal expansion coefficients between TMD monolayers and substrates can drive the 1H to 1T transition during cooling after CVD growth. Moreover, grain boundaries in the 2D crystals act as the nucleation sites of the 1T phase and the lattice strain perturbations from alloying noticeably promote the formation of the metastable 1T phase. This work has an important implication in tailoring structure and properties of CVD grown 2D TMDs by phase engineering.

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