Issue 50, 2022

Revealing the anisotropic phonon behaviours of layered SnS by angle/temperature-dependent Raman spectroscopy

Abstract

Tin sulfide (SnS), a IV–VI group layered compound, has attracted much attention because of its excellent thermoelectric properties along the crystallographic b-axis. However, there are few reports on the identification of its in-plane orientation. We observe a strong anisotropy of the in-plane Raman signal in bulk SnS. With the help of ab initio calculations, the vibrational symmetry of each observed Raman mode in the cleaved (00l)-plane is consistent with the experimental values. The angle-resolved polarized Raman spectroscopy, combined with electron backscattered diffraction technology, is utilized to systematically investigate the in-plane anisotropy of the phonon response and then determine the in-plane orientation. Furthermore, the temperature-dependent and laser-power-dependent Raman scattering analyses reveal that the adjacent layers in the SnS crystals show a relatively weak van der Waals interaction. These findings could provide much-needed experimental information for future applications related to the anisotropic transport properties of SnS single crystals.

Graphical abstract: Revealing the anisotropic phonon behaviours of layered SnS by angle/temperature-dependent Raman spectroscopy

Supplementary files

Article information

Article type
Paper
Submitted
13 Okt. 2022
Accepted
04 Nov. 2022
First published
10 Nov. 2022
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2022,12, 32262-32269

Revealing the anisotropic phonon behaviours of layered SnS by angle/temperature-dependent Raman spectroscopy

X. Gong, T. Yan, J. Li, J. Liu, H. Zou, B. Zhang, H. Wu, Z. Zhou and X. Zhou, RSC Adv., 2022, 12, 32262 DOI: 10.1039/D2RA06470G

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