MgO intercalation and crystallization between epitaxial graphene and Ru(0001)  

作　　者：Xue-Yan Wang Hui Guo Jin-An Shi Yi Biao Yan Li Guang-Yuan Han Shuai Zhang Kai Qian Wu Zhou Xiao Lin Shi-Xuan Du Cheng-Min Shen Hong-Liang Lu Hong-Jun Gao 

机构地区：[1]Institute of Physics and University of Chinese Academy of Sciences,Chinese Academy of Sciences,Beijing 100190,China [2]CAS Center for Excellence in Topological Quantum Computation,University of Chinese Academy of Sciences,Beijing 100190,China [3]Songshan Lake Materials Laboratory,Dongguan 523808,China

出　　处：《Rare Metals》2022年第1期304-310,共7页稀有金属（英文版）

基　　金：This study was financially supported by the National Key Research&Development Program of China(Nos.2019YFA0308500,2018YFA0305800 and 2016YFA0202300);the National Natural Science Foundation of China(Nos.61888102 and 61925111);the Strategic Priority Research Program of Chinese Academy of Sciences(Nos.XDB30000000 and XDB28000000);the CAS Key Laboratory of Vacuum Physics.

摘　　要：Graphene on insulator is the foundation of its practical applications in electronic information technology.However,fabrication of graphene on insulating substrates suffers from small size and limited quality by direct growth of graphene on dielectric substrates,and the method of transferring graphene onto insulating substrates is not so compatible with the large-scale production in industry.Here,we report the fabrication of high-quality,large-area,single-crystal graphene on crystalline magnesium oxide(MgO),which has a dielectric constant of 7–10.Magnesium and oxygen are intercalated at the interface of epitaxial graphene/Ru(0001)and form crystalline structure after high-temperature annealing.The graphene/MgO/Ru(0001)sample was characterized by low energy electron diffraction(LEED),scanning tunneling microscopy(STM),X-ray photoelectron spectroscopy(XPS),and scanning transmission electron microscopy(STEM).LEED pattern shows that the magnesium oxide displays crystalline structure,and STM studies show clearly that the top layer is graphene.STEM characterization of as-intercalated sample demonstrates that the MgO intercalation layer,with a thickness of up to 2.3 nm,has a crystal structure of rock salt MgO,and the out-of-plane crystal orientation is[001].Our work provides a new route for fabrication of graphene on high dielectric constant insulators,which may have potential applications in future electronics.

关 键 词：CRYSTALLINE dielectric MAGNESIUM 

分 类 号：O469[理学—凝聚态物理] TQ127.11[理学—电子物理学] TQ132.2[理学—物理]