Open AccessThe three A symmetry Raman modes of kesterite in Cu_2ZnSnSe_4
Author(s) -
Rabie Djemour,
Alex Redinger,
Marina Mousel,
Levent Gütay,
Xavier Fontané,
Victor IzquierdoRoca,
Alejandro PérezRodríguez,
Susanne Siebentritt
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.00a695
Subject(s) - raman spectroscopy , kesterite , phonon , materials science , raman scattering , optics , coherent anti stokes raman spectroscopy , polarization (electrochemistry) , symmetry (geometry) , molecular physics , spectroscopy , condensed matter physics , physics , chemistry , optoelectronics , band gap , geometry , mathematics , czts , quantum mechanics
We investigate CZTSe films by polarization dependent Raman spectroscopy. The main peaks at 170 cm(-1), and 195 cm(-1) are found to have A symmetry. The Raman signal at 170 cm(-1) is found to be composed of two modes at 168 cm(-1) and 172 cm(-1). We attribute these three Raman peaks to the three A symmetry modes predicted for kesterite ordered Cu(2)ZnSnSe(4). The main Raman peak is asymmetrically broadened towards lower energies. Possible sources of the broadening are tested through temperature and depth dependent measurements. The broadening is attributed to phonon confinement effects related to the presence of lattice defects.