Raman spectra of the orthorhombic semiconductor compound Cu2SnTe3

Abstract

The optical phonon spectrum of the semiconductor Cu2SnTe3, that crystallizes in the orthorhombic structure with space group Imm2 (C2v20), have been studied by measuring unpolarized Raman scattering between 10 and 300 K. The experimental frequencies of the phonon modes observed were compared to those calculated by using simplified lattice dynamical models reported in the literature. From combined analysis of these results together with the factor group analysis of the zone-center vibrational modes, valuable information about these modes was obtained and their possible symmetry was assigned. A1 modes at 71, 123, 167, 176 and 190 cm−1; A2 modes 115 and 131 cm−1; B1 modes at 76, 142 and 152 cm−1; B2 modes at 89, 100 and 206 cm−1; a overtone at 246 cm−1, and combinations at 218, 270 and 292 cm−1; have been observed in this compound.