Photoluminescence and Raman Spectra of ZnO Thin Films by Charged Liquid Cluster Beam Technique

Abstract

Zinc oxide (ZnO) thin films have been deposited on glass substrates from isopropyl solutions of zinc acetate by using the Charged Liquid Cluster Beam (CLCB) technique. The structure of the films is determined by the temperature of the substrate. Raman scattering spectra of the films obtained by non-resonant excitation are similar to those of bulk polycrystalline ZnO. The photoluminescence (PL) spectra of the films exhibit at 10 K four broad emission bands in the visible and near infrared spectral range. The effect of post-deposition annealing on the red emission band is also reported.