Raman Scattering Studies of CuInS2 Films Grown by RF Ion Plating

CuInS2 films were grown by rf ion plating and their crystallinity was characterized by Raman spectroscopy. Six Raman peaks were observed, most of which were assigned to the phonon modes of CuInS2, except for a peak at 307 cm-1 that was clearly observed in the films with a poor crystalline quality. The peak at 307 cm-1 was assigned to the totally symmetric mode by polarized Raman measurement. This peak was related to some kind of a localized mode with a smaller mean atomic weight of cations.