Temperature-dependent Raman spectroscopy studies of 1-5-layer WSe2

作     者：Zhonglin Li Yingying Wang Jie Jiang Yao Liang Bo Zhong Hong Zhang Kai Yu Guangfeng Kan Mingqiang Zou Zhonglin Li;Yingying Wang;Jie Jiang;Yao Liang;Bo Zhong;Hong Zhang;Kai Yu;Guangfeng Kan;Mingqiang Zou

作者机构：Department of Optoelectronic ScienceHarbin Institute of Technology at WeihaiWeihai 264209China School of Marine Science and TechmologyHarbin Institute of Technology at WeihaiWeihai 264209China School of Materials Science and Engineering Dalian Jiaotong UniversityDalian 116028China School of Materials Science and EngineeringHarbin Institute of Technology at WeihaiWeihai 264209China Chinese Academy of Inspection and Quarantine(CAIQ)No.A3Gaobeidian RoadChaoyang DistrictBeijing 100123China 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2020年第13卷第2期

页      面：591-595页

核心收录：

学科分类：0808[工学-电气工程] 081704[工学-应用化学] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070302[理学-分析化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：This work was supported the National Key R&D Program of China(Nos.2017YFF0108900,2016YFF0203802,and 2017YFD080120203) the Dalian Youth Science and Technology Star Project(No.2017RQ138) the project from Liaoning Education Department(No.JDL2019015) the National Natural Science Foundation of China(Nos.51872058 and 21904029) the Fundamental Research Funds for Central Universities(No.HIT.NSRIF 2019071) 

主　　题：WSe2 thermal expansion coefficients temperature-dependent Raman spectroscopy 

摘      要：In this work,Raman measurements of 1-5-layer WSe2 supported on SiO2/Si in the temperature range of 133 to 533 K are reported.A physical model including both volume effect and temperature effect is used to quantitatively understand the nonlinear temperature dependence of E2g^1Raman *** is found this nonlinear dependence of Raman mode mainly originates from thermal expansion effect and three-phonon *** former effect increases with an increase in number of layers,which is inverse for the latter *** temperature-dependent thermal expansion coefficients of 1-5-layer WSe2 are also obtained from Raman *** full width at half maximum(FWHM)of E;g mode is also systematically studied both experimentally and theoretically in the temperature range of 133 to 413 *** is found that the increase in FWHM of E2g^1 mode originates from decaying of E2g^1 *** work will promote the understanding of anharmonic behaviors of phonons in WSe2 flakes with different thicknesses.