Fabricating model heterostructures of large-area monolayer or bilayer MoS2 on an Au(111) surface under ultra-high vacuum

IF 4.4 2区 物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Bingrui Li, Weiwei Huang, Chaoqi Dai, Boyuan Wen, Yan Shen, Fei Liu, Ningsheng Xu, Fangfei Ming, Shaozhi Deng
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Abstract

Fabricating heterojunctions with precisely controlled interfacial structures is crucial for exploring novel low-dimensional physics and for realizing high-performance devices. However, such capabilities are often constrained by contamination from the ambient environment or by the limitations of applicable methods and materials under vacuum conditions. In this study, MoS2/Au(111) heterostructures were fabricated by exfoliating MoS2 thin layers onto a crystallized Au(111) surface using a gold-assisted exfoliation method in an ultra-high vacuum environment. This method yields millimeter-sized monolayer or sub-millimeter-sized bilayers with contamination-free interfaces, which are unattainable for samples made in air. Scanning tunneling microscopy revealed that both the monolayer and the bilayer exhibit uniform and well-ordered moiré superlattices controlled by the twisting angle between the Au(111) surface and the MoS2 overlayer. The direct contact with the Au surface renders the monolayer MoS2 weakly metallic, while a less coupled bilayer is semiconducting, indicating a 0.54 eV Schottky barrier for the MoS2/Au(111) contact. This method is applicable to various combinations of van der Waals materials and metal surfaces. The uniform and controllable heterojunctions can serve as ideal model systems for exploring semiconductor–metal interfaces and atomic structures formed within.
在超高真空下在金(111)表面制备大面积单层或双层 MoS2 异质结构模型
制造具有精确控制界面结构的异质结对于探索新型低维物理和实现高性能器件至关重要。然而,这种能力往往受到环境污染或真空条件下适用方法和材料的限制。在本研究中,通过在超高真空环境下使用金辅助剥离法在结晶金(111)表面剥离 MoS2 薄层,制备了 MoS2/金(111)异质结构。这种方法可以获得毫米级的单层或亚毫米级的双层,且界面无污染,这是在空气中制作的样品无法实现的。扫描隧道显微镜显示,单层和双层都呈现出均匀有序的摩尔超晶格,受金(111)表面和 MoS2 覆盖层之间扭曲角度的控制。与金表面的直接接触使单层 MoS2 呈弱金属性,而耦合度较低的双层则呈半导体性,这表明 MoS2/Au(111) 接触存在 0.54 eV 的肖特基势垒。这种方法适用于范德华材料和金属表面的各种组合。均匀且可控的异质结可作为探索半导体-金属界面及其内部形成的原子结构的理想模型系统。
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来源期刊
Results in Physics
Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY
CiteScore
8.70
自引率
9.40%
发文量
754
审稿时长
50 days
期刊介绍: Results in Physics is an open access journal offering authors the opportunity to publish in all fundamental and interdisciplinary areas of physics, materials science, and applied physics. Papers of a theoretical, computational, and experimental nature are all welcome. Results in Physics accepts papers that are scientifically sound, technically correct and provide valuable new knowledge to the physics community. Topics such as three-dimensional flow and magnetohydrodynamics are not within the scope of Results in Physics. Results in Physics welcomes three types of papers: 1. Full research papers 2. Microarticles: very short papers, no longer than two pages. They may consist of a single, but well-described piece of information, such as: - Data and/or a plot plus a description - Description of a new method or instrumentation - Negative results - Concept or design study 3. Letters to the Editor: Letters discussing a recent article published in Results in Physics are welcome. These are objective, constructive, or educational critiques of papers published in Results in Physics. Accepted letters will be sent to the author of the original paper for a response. Each letter and response is published together. Letters should be received within 8 weeks of the article''s publication. They should not exceed 750 words of text and 10 references.
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