Optical phonons of SnSe(1−x)S x layered semiconductor alloys

Tharith Sriv, Thi Minh Hai Nguyen, Yangjin Lee, Soo Yeon Lim, Van Quang Nguyen, Kwanpyo Kim, Sunglae Cho, Hyeonsik Cheong

Research output: Contribution to journalArticle

Abstract

The evolution of the optical phonons in layered semiconductor alloys SnSe(1–x)Sx is studied as a function of the composition by using polarized Raman spectroscopy with six different excitation wavelengths (784.8, 632.8, 532, 514.5, 488, and 441.6 nm). The polarization dependences of the phonon modes are compared with transmission electron diffraction measurements to determine the crystallographic orientation of the samples. Some of the Raman modes show significant variation in their polarization behavior depending on the excitation wavelengths. It is established that the maximum intensity direction of the Ag2 mode of SnSe(1−x)Sx (0 ≤ x ≤ 1) does not depend on the excitation wavelength and corresponds to the armchair direction. It is additionally found that the lower-frequency Raman modes of Ag1, Ag2 and B3g1 in the alloys show the typical one-mode behavior of optical phonons, whereas the higher-frequency modes of B3g2, Ag3 and Ag4 show two-mode behavior.

Original languageEnglish
Article number11761
JournalScientific reports
Volume10
Issue number1
DOIs
Publication statusPublished - 2020 Dec 1

All Science Journal Classification (ASJC) codes

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    Sriv, T., Nguyen, T. M. H., Lee, Y., Lim, S. Y., Nguyen, V. Q., Kim, K., Cho, S., & Cheong, H. (2020). Optical phonons of SnSe(1−x)S x layered semiconductor alloys. Scientific reports, 10(1), [11761]. https://doi.org/10.1038/s41598-020-68744-2