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Title: Phase-controlled synthesis of monolayer ternary telluride with a random local displacement of tellurium atoms
Authors: Tang, Bijun
Zhou, Jiadong
Sun, Pingping
Wang, Xiaowei
Bai, Lichun
Dan, Jiadong
Yang, Jiefu
Zhou, Kun
Zhao, Xiaoxu
Pennycook, Stephen J.
Liu, Zheng
Keywords: Engineering::Materials
Issue Date: 2019
Source: Tang, B., Zhou, J., Sun, P., Wang, X., Bai, L., Dan, J., Yang, J., Zhou, K., Zhao, X., Pennycook, S. J. & Liu, Z. (2019). Phase-controlled synthesis of monolayer ternary telluride with a random local displacement of tellurium atoms. Advanced Materials, 31(23), 1900862-.
Project: NRF-RF2013-08
Journal: Advanced Materials
Abstract: Alloying 2D transition metal dichalcogenides has opened up new opportunities for bandgap engineering and phase control. Developing a simple and scalable synthetic route is therefore essential to explore the full potential of these alloys with tunable optical and electrical properties. Here, the direct synthesis of monolayer WTe2xS2(1−x) alloys via one-step chemical vapor deposition (CVD) is demonstrated. The WTe2xS2(1−x) alloys exhibit two distinct phases (1H semiconducting and 1T ′ metallic) under different chemical compositions, which can be controlled by the ratio of chalcogen precursors as well as the H2 flow rate. Atomic-resolution scanning transmission electron microscopy–annular dark field (STEM-ADF) imaging reveals the atomic structure of as-formed 1H and 1T ′ alloys. Unlike the commonly observed displacement of metal atoms in the 1T ′ phase, local displacement of Te atoms from original 1H lattice sites is discovered by combined STEM-ADF imaging and ab initio molecular dynamics calculations. The structure distortion provides new insights into the structure formation of alloys. This generic synthetic approach is also demonstrated for other telluride-based ternary monolayers such as WTe2xSe2(1−x) single crystals.
ISSN: 0935-9648
DOI: 10.1002/adma.201900862
Rights: © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles

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