Issue 16, 2016

Optical phonons in the kesterite Cu2ZnGeS4 semiconductor: polarized Raman spectroscopy and first-principle calculations

Abstract

A comprehensive vibrational analysis of the kesterite Cu2ZnGeS4 semiconductor (space group I[4 with combining macron]) is reported, which includes experimental in-plane rotation polarized Raman scattering measurements from the (1 0 1)-single crystal facet as well as first principle lattice dynamic calculations. 17 out of the 27 expected vibrational modes of the kesterite structure are unambiguously identified. Raman scattering measurements performed under resonant excitation conditions show a pronounced enhancement of the longitudinal optical components of the polar modes. The appearance of several additional lines in the Raman spectra have been interpreted as being due to the presence of inclusions of Cu2ZnGeS4 polymorph with the P[4 with combining macron]2c lattice symmetry, which differs from the kesterite by cation sublattice arrangement.

Graphical abstract: Optical phonons in the kesterite Cu2ZnGeS4 semiconductor: polarized Raman spectroscopy and first-principle calculations

Supplementary files

Article information

Article type
Paper
Submitted
15 Dec 2015
Accepted
21 Jan 2016
First published
25 Jan 2016

RSC Adv., 2016,6, 13278-13285

Optical phonons in the kesterite Cu2ZnGeS4 semiconductor: polarized Raman spectroscopy and first-principle calculations

M. Guc, A. P. Litvinchuk, S. Levcenko, M. Ya. Valakh, I. V. Bodnar, V. M. Dzhagan, V. Izquierdo-Roca, E. Arushanov and A. Pérez-Rodríguez, RSC Adv., 2016, 6, 13278 DOI: 10.1039/C5RA26844C

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