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Research Article

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

Zhonglin Li1, Yingying Wang1(), Jie Jiang2, Yao Liang3, Bo Zhong4, Hong Zhang2, Kai Yu2, Guangfeng Kan2, Mingqiang Zou5()
Department of Optoelectronic Science, Harbin Institute of Technology at Weihai, Weihai 264209, China
School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China
School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China
School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China
Chinese Academy of Inspection and Quarantine (CAIQ), No. A3, Gaobeidian Road, Chaoyang District, Beijing 100123, China
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Abstract

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 E1 2g Raman mode. It is found this nonlinear dependence of Raman mode mainly originates from thermal expansion effect and three-phonon scattering. The former effect increases with an increase in number of layers, which is inverse for the latter effect. The temperature-dependent thermal expansion coefficients of 1-5-layer WSe2 are also obtained from Raman spectra. The full width at half maximum (FWHM) of E1 2g mode is also systematically studied both experimentally and theoretically in the temperature range of 133 to 413 K. It is found that the increase in FWHM of E1 2g mode originates from decaying of E1 2g phonon. This work will promote the understanding of anharmonic behaviors of phonons in WSe2 flakes with different thicknesses.

Keywords

WSe2thermal expansion coefficientstemperature-dependent Raman spectroscopy

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Nano Research
Volume 13 Issue 2,
February 2020
Pages 591-595
DOI: 10.1007/s12274-020-2669-0
Cite this article:
Li Z, Wang Y, Jiang J, et al. Temperature-dependent Raman spectroscopy studies of 1-5-layer WSe2. Nano Research, 2020, 13(2): 591-595. https://doi.org/10.1007/s12274-020-2669-0
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