Abstract
In this paper, we demonstrate the study of the vibrational mode of HfxSn1-xSe2 (x = 0, 0.05, 0.1, 0.15, 0.2) crystals as a function of temperature. The temperature-dependent Raman spectra were measured in the temperature range 80 K–300 K. We demonstrated the careful study of temperature-dependent behaviour of out-of-plane A1g vibrational mode of the 2H-type lattice structure of HfxSn1-xSe2 crystals. The Raman peak is shifted towards the higher frequency side on decreasing temperature. The first-order temperature coefficient and an anharmonic constant were evaluated by fitting temperature dependence Raman peak and FWHM. The non-linear behaviour in Raman shifting with temperature is explained by optical phonon decay into two or three acoustic modes. The present investigations can be utilized for further study of the optical and thermal properties of HfxSn1-xSe2 (x = 0, 0.05, 0.1, 0.15, 0.2) transition metal dichalcogenides.
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