RF sputtering; ZnO; nanocrystals; phase improvement.
Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi. India
Adv. Mater. Lett., 2013, Current Issue, 4 (5), pp 343-346
Publication Date (Web): Feb 23, 2013
Copyright © IAAM-VBRI Press
In the present study we report the influence of variation in amount of Zn on growth and optical properties of thin films of ZnO nanocrystals in silica matrix deposited by rf magnetron co-sputtering with substrate heating at 200o C. RBS studies indicate change in the concentration of Zn in the films while Raman spectroscopy measurements indicate presence of excess zinc with different concentration. The XRD spectra of the thin films shows the formation of strong ZnO phase nanocrystals with different sizes in different films while the UV-VIS spectra shows variation in the band edge energy of the ZnO nanocrystals for these films. FT-IR spectra of the films show the Zn-O, Zn-O-Si and Si-O-Si vibrational features related to ZnO, Zn2SiO4 and SiOx phases in the films. The results suggest growth of stable ZnO nanocrystals in silica matrix having better phase and optical quality with increase in the Zn concentration in the thin films, which may be useful in optical applications of ZnO.
RF sputtering, ZnO, nanocrystals, phase improvement.