Journal
SCIENCE BULLETIN
Volume 67, Issue 16, Pages 1649-1658Publisher
ELSEVIER
DOI: 10.1016/j.scib.2022.06.022
Keywords
Non-layered two-dimensional materials; Transition metal chalcogenides; Dual-metal precursors; Chemical vapor deposition; Ordered cation vacancies
Categories
Funding
- National Science Fund for Distinguished Young Scholars [52125309]
- National Natural Science Foundation of China [51991343, 51920105002, 51991340, 52188101, 11974156]
- Guangdong Innovative and Entrepreneurial Research Team Program [2017ZT07C341, 2019ZT08C044]
- Bureau of Industry and Information Technology of Shenzhen [20200925161102001]
- Graphene Manufacturing Innova-tion Center Project? [201901171523]
- Shenzhen Basic Research Project [201901171523, JCYJ20200109144616617]
- Shenzhen Science and Technology Program [JCYJ20190809180605522, KQTD20190929173815000]
- Hong Kong Ultravision holdings Co., Limited
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This study presents a universal method for growing non-layered transition metal chalcogenides (TMCs) using dual-metal precursors. The researchers successfully synthesized a series of non-layered 2D materials with ordered cation vacancies and discovered their unique properties.
Two-dimensional (2D) transition metal chalcogenides (TMCs) are promising for nanoelectronics and energy applications. Among them, the emerging non-layered TMCs are unique due to their unsaturated dangling bonds on the surface and strong intralayer and interlayer bonding. However, the synthesis of non-layered 2D TMCs is challenging and this has made it difficult to study their structures and properties at thin thickness limit. Here, we develop a universal dual-metal precursors method to grow non-layered TMCs in which a mixture of a metal and its chloride serves as the metal source. Taking hexagonal Fe1-xS as an example, the thickness of the Fe1-xS flakes is down to 3 nm with a lateral size of over 100 mu m. Importantly, we find ordered cation Fe vacancies in Fe1-xS, which is distinct from layered TMCs like MoS2 where anion vacancies are commonly observed. Low-temperature transport measurements and theoretical calculations show that 2D Fe1-xS is a stable semiconductor with a narrow bandgap of similar to 60 meV. In addition to Fe1-xS, the method is universal in growing various non-layered 2D TMCs containing ordered cation vacancies, including Fe1-xSe, Co1-xS, Cr1-xS, and V1-xS. This work paves the way to grow and exploit properties of non-layered materials at 2D thickness limit. (C) 2022 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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