Anomalous lattice vibrations of CVD-grown monolayer MoS2 probed using linear polarized excitation light

Feng Li, Teng De Huang, Yann Wen Lan, Ting Hua Lu, Tao Shen, Kristan Bryan Simbulan, Junjie Qi

研究成果: 雜誌貢獻文章

4 引文 斯高帕斯(Scopus)

摘要

A novel physical phenomenon and advanced application have been explored in 2D low-dimensional van der Waals layered materials due to their reduced in-plane symmetry. The light-matter interaction is observed upon rapid characterization of the 2D material's crystal orientation. Here, the effects of the sample's rotation angle and the incident light's linear polarization angle on the Raman scattering of chemical vapor deposition (CVD)-grown monolayer MoS2 were investigated. The results show that the crystal orientation of monolayer MoS2 can be distinguished by analyzing the intensity ratio and frequency difference of its two dominant Raman vibration modes. In addition, an increase in the incident light's power intensity causes the Raman peaks to red shift due to the photothermal effect. Strikingly, it was found that, with an increase in the incident linear polarization angle, the out-of-plane A1g phonon mode red shifts, while the in-plane E2g1 phonon mode blue shifts. The frequency difference consequently decreases from 19.5 cm-1 to 17.4 cm-1. The anomalous lattice vibrations of monolayer MoS2 originate from the built-in strain introduced by the SiO2/Si substrate. This work paves the way for the investigation and characterization of 2D MoS2, providing further understanding of the light-matter interaction in 2D materials, which is beneficial for advanced studies on anisotropic MoS2 based electronic and photoelectric information technologies and sensing applications.

原文英語
頁(從 - 到)13725-13730
頁數6
期刊Nanoscale
11
發行號29
DOIs
出版狀態已發佈 - 2019 八月 7

ASJC Scopus subject areas

  • Materials Science(all)

指紋 深入研究「Anomalous lattice vibrations of CVD-grown monolayer MoS<sub>2</sub> probed using linear polarized excitation light」主題。共同形成了獨特的指紋。

  • 引用此