An efficient route to prepare suspended monolayer for feasible optical and electronic characterizations of two-dimensional materials  

作　　者：Yuan Huang Yun-Kun Wang Xin-Yu Huang Guan-Hua Zhang Xu Han Yang Yang Yunan Gao Lei Meng Yushu Wang Guang-Zhou Geng Li-Wei Liu Lin Zhao Zhi-Hai Cheng Xin-Feng Liu Ze-Feng Ren Hui-Xia Yang Yufeng Hao Hong-Jun Gao Xing-Jiang Zhou Wei Ji Ye-Liang Wang 

机构地区：[1]Advanced Research Institute of Multidisciplinary Science,Beijing Institute of Technology,Beijing,China [2]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing,China [3]Songshan Lake Materials Laboratory,Dongguan,China [4]State Key Laboratory for Artificial Microstructure and Mesoscopic Physics,School of Physics,Peking University,Beijing,China [5]Frontiers Science Center for Nanooptoelectronics&Collaborative Innovation Center of Quantum Matter,Beijing,China [6]State Key Laboratory of Molecular Reaction Dynamics,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian,China [7]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan,China [8]Minzu University of China,Beijing,China [9]National Laboratory of Solid State Microstructures,College of Engineering and Applied Sciences,Jiangsu Key Laboratory of Artificial Functional Materials,Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing,China [10]School of Information and Electronics,MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices,Beijing Institute of Technology,Beijing,China [11]Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-Nano Devices,Renmin University of China,Beijing,China [12]National Center for Nanoscience and Technology(NCNST)of China,Beijing,China [13]Haian Institute of New Technology,Nanjing University,Haian,China [14]University of Chinese Academy of Sciences,Beijing,China

出　　处：《InfoMat》2022年第2期126-138,共13页信息材料（英文）

基　　金：National Key Research and Development Program of China,Grant/Award Numbers:2019YFA0308000,2018YFA0306302,2018YFA0305800,2018YFA0704201;Youth Innovation Promotion Association of CAS,Grant/Award Numbers:2019007,2018013;National Natural Science Foundation of China,Grant/Award Numbers:62022089,11874405,61725107,61971035,61725107,92163206,51772145;National Basic Research Program of China,Grant/Award Number:2015CB921300;Strategic Priority Research Program(B)of the Chinese Academy of Sciences,Grant/Award Numbers:XDB07020300,XDB30000000;Research Program of Beijing Academy of Quantum Information Sciences,Grant/Award Number:Y18G06;Natural Science Foundation of Jiangsu Province,Grant/Award Number:BK20180003;333 high level talent training project of JiangSu and JiangHai talent program of NanTong。

摘　　要：Two-dimensional(2D)materials are highly sensitive to substrates,interfaces,and the surrounding environments.Suspended 2D materials are free from substrate-induced effects,thus an ideal approach to study their intrinsic properties.However,it is very challenging to prepare large-area suspended 2D materials with high efficiency.Here we report a universal method,based on pretreatments of densely patterned hole array substrates with either oxygenplasma or gold film deposition,to prepare large-area suspended mono-and few-layer 2D materials.Multiple structural,optical,and electrical characterization tools were used to fully evaluate the improved performance of various suspended 2D layers.Some of these observations reported in this study are:(1)Observation of a new Raman low frequency mode for the suspended MoS_(2);(2)Significantly stronger photoluminescence(PL)and second harmonic generation(SHG)signals of suspended WSe_(2),which enables the study of new optical transition processes;(3)The low energy electron diffraction pattern on suspended MoS_(2) also exhibits much sharper spots than that on the supported area;and(4)The mobility of suspended graphene device approaches 300000 cm^(2) V^(-1) s^(-1),which is desirable to explore the intrinsic properties of graphene.This work provides an innovative and efficient route for fabricating suspended 2D materials,and we expect that it can be broadly used for studying intrinsic properties of 2D materials and in applications of hybrid active nanophotonic and electronic devices.

关 键 词：mechanical exfoliation PHOTOLUMINESCENCE Raman spectrum suspended 2D materials 

分 类 号：TB30[一般工业技术—材料科学与工程]