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Dual-metal precursors for the universal growth of non-layered 2D transition metal chalcogenides with ordered cation vacancies

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Science Bulletin 2022年第16期67卷 1649-1658,M0004页

作者： Junyang Tan Zongteng Zhang Shengfeng Zeng Shengnan Li Jingwei Wang Rongxu Zheng Fuchen Hou Yinping Wei Yujie Sun Rongjie Zhang Shilong Zhao Huiyu Nong Wenjun Chen Lin Gan Xiaolong Zou Yue Zhao Junhao Lin Bilu Liu Hui-Ming Cheng Shenzhen Geim Graphene Center Tsinghua-Berkeley Shenzhen Institute and Institute of Materials ResearchShenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China Department of Physics and Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices Southern University of Science and TechnologyShenzhen 518055China School of Electronic Information Engineering Foshan UniversityFoshan 528000China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China

Two-dimensional(2D)transition metal chalcogenides(TMCs)are promising for nanoelectronics and energy *** them,the emerging non-layered TMCs are unique due to their unsaturated dangling bonds on the surface and strong intralayer and interlayer ***,the synthesis of non-layered 2D TMCs is challenging and this has made it difficult to study their structures and properties at thin thickness ***,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 *** hexagonal Fe_(1-x)S as an example,the thickness of the Fe_(1-x)S flakes is down to 3 nm with a lateral size of over 100 μ***,we find ordered cation Fe vacancies in Fe_(1-x)S,which is distinct from layered TMCs like MoS_(2) where anion vacancies are commonly ***-temperature transport measurements and theoretical calculations show that 2D Fe_(1-x)S is a stable semiconductor with a narrow bandgap of60 *** addition to Fe_(1-x)S,the method is universal in growing various non-layered 2D TMCs containing ordered cation vacancies,including Fe_(1-x)Se,Co_(1-x)S,Cr_(1-x)S,and V_(1-x)*** work paves the way to grow and exploit properties of non-layered materials at 2D thickness limit.

关键词： Non-layered two-dimensional materials Transition metal chalcogenides Dual-metal precursors Chemical vapor deposition ordered cation vacancies

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