Exfoliation of 2D van der Waals crystals in ultrahigh vacuum for interface engineering  

超高真空环境下二维范德华晶体的机械剥离及界面工程

作　　者：Zhenyu Sun Xu Han Zhihao Cai Shaosheng Yue Daiyu Geng Dongke Rong Lin Zhao Yi-Qi Zhang Peng Cheng Lan Chen Xingjiang Zhou Yuan Huang Kehui Wu Baojie Feng 孙振宇;韩旭;蔡志浩;岳绍圣;耿岱玉;荣东珂;赵林;章一奇;程鹏;陈岚;周兴江;黄元;吴克辉;冯宝杰(Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;Advanced Research Institute of Multidisciplinary Science,Beijing Institute of Technology,Beijing 100081,China;School of Science,China University of Geosciences,Beijing 100083,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Songshan Lake Materials Laboratory,Dongguan 523808,China;Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials,Peking University,Beijing 100871,China)

机构地区：[1]Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]Advanced Research Institute of Multidisciplinary Science,Beijing Institute of Technology,Beijing 100081,China [3]School of Science,China University of Geosciences,Beijing 100083,China [4]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [5]Songshan Lake Materials Laboratory,Dongguan 523808,China [6]Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials,Peking University,Beijing 100871,China

出　　处：《Science Bulletin》2022年第13期1345-1351,M0004,共8页科学通报（英文版）

基　　金：supported by the Ministry of Science and Technology of China(2018YFE0202700 and 2019YFA0308000);the National Natural Science Foundation of China(11974391,11825405,1192780039,62022089,11874405,and U2032204);the Beijing Natural Science Foundation(Z180007);the International Partnership Program of Chinese Academy of Sciences(112111KYSB20200012);Chongqing Outstanding Youth Fund(2021ZX0400005);the Strategic Priority Research Program of Chinese Academy of Sciences(XDB33030100 and XDB33000000)。

摘　　要：Two-dimensional(2D)materials and their heterostructures have been intensively studied in recent years due to their potential applications in electronic,optoelectronic,and spintronic devices.Nonetheless,the realization of 2D heterostructures with atomically flat and clean interfaces remains challenging,especially for air-sensitive materials,which hinders the in-depth investigation of interface-induced phenomena and the fabrication of high-quality devices.Here,we circumvented this challenge by exfoliating 2D materials in an ultrahigh vacuum.Remarkably,ultraflat and clean substrate surfaces can assist the exfoliation of 2D materials,regardless of the substrate and 2D material,thus providing a universal method for the preparation of heterostructures with ideal interfaces.In addition,we studied the properties of two prototypical systems that cannot be achieved previously,including the electronic structure of monolayer phospherene and optical responses of transition metal dichalcogenides on different metal substrates.Our work paves the way to engineer rich interface-induced phenomena,such as proximity effects and moirésuperlattices.近年来,二维材料及其异质结由于在电子、光电及自旋器件领域的应用潜力而得到广泛关注.然而,获得原子级平整且洁净的二维异质结依然充满挑战性,尤其对于那些环境敏感的材料而言,这极大地制约了对其本征物性的研究及高质量器件的制备.因此,二维材料科学领域急需一种普适的二维异质结制备技术.本文开发出了超高真空环境下的机械剥离及异质结制备技术.利用分子束外延技术制备的原子级平整的衬底适用于剥离绝大多数二维材料,从而为高质量异质结的制备提供了一种普适的方法.基于这一技术,作者研究了2个传统方法难以研究的材料体系:单层黑磷的电子结构以及单层过渡金属硫族化合物在不同金属衬底上的光学响应.该工作报道的方法有助于深入研究二维异质界面产生的奇特现象,比如近邻效应、界面增强的长程序等.

关 键 词：2D van der Waals crystals Ultrahigh vacuum Mechanical exfoliation Interface engineering Universal method 

分 类 号：TB34[一般工业技术—材料科学与工程]