Abstract    Zinc oxide thin films were deposited on soda-lime glass substrates from an aqueous zinccontaining complex by two-stage chemical deposition (TSCD) method. Longmuir adsorption model showed that the adsorption of atoms on the surface of the substrate was typically physical. The relation between the fractional coverage, θ, with the equilibrium constant of the adsorption reaction was nonlinear indicating that the adsorption was non-ideal. The percentage of porosity, 1-θ, of the thin layer was determined as a function of Zn2+ concentration of the solution. By application of XRD technique, it was shown that pure crystalline ZnO of controllable thickness could be deposited by TSCD method on the surface of the substrate. The procedure consisted of immersion into (a) cold Zn2+ complex containing solution and (b) hot water at 90, 95 and 98°C.

Keywords    Zinc Oxide, Langmuir Adsorption, Physisorption, Immersion, TSCD

References    1. Jin, B.J., Bae, S.H. and Lee, S.Y., “Im S., Effects of Native Defects on Optical and Electrical Properties of ZnO Prepared by Pulsed Laser Deposition”, Mater. Sci. Eng., Vol. 71, (2000), 301-305. 2. Lin, B., Fu, Z., Jia, Y. and Liao, G., “Defect Photoluminescence of Undoping ZnO Films and Its Dependence on Annealing Conditions”, Journal of Electrochem. Soc., Vol. 148, (2001), G110-G113. 3. Wessler, B., Steinecker, A. and Mader, W., “Epitaxial Growth of ZnO Thin Films on ScAlMgO4 (0001) by Chemical Solution Deposition”, Journal of Crystal Growth, Vol. 242, (2002), 283- 292. 4. Shishiyanu, S.T., Lupan, O.I., Monaico, E.V., Ursaki, V.V., Shishiyanu, T.S. and Tiginyanu, I.M., “ “Photoluminescence of Chemical Bath Deposited ZnO: Al Films Treated by Rapid Thermal Annealing”, Thin Solid Films, Vol. 488, (2005), 15-19. 5. Ramamoorthy, K., Sanjeeviraja, C., Jayachadran, M., Sankaranarayanan, K., Bhattacharaya, D. and Kukreja, M.L., “Preparation and Characterization of ZnO Thin Films on InP by Laser-Molecular Beam Epitaxy Technique for Solar Cells”, Journal of Crystal Growth, Vol. 226, (2001), 281-286. 6. Sadrnezhaad, S.K. and Simchi, A., “Simulation of the Iron Smelting-Reduction Process”, Journal of Materials Science and Technology, Vol. 15, (1999), 1-7. 7. Sadrnezhaad S.K. and Vaezi M.R., “Kinetics of TSCD Zinc Oxide Nano-Layer Growth by Modified Diffuse-Interface Model”, Ceramics International, Vol. 33, (2006), 1409-1417. 8. Sadrnezhaad S.K., “Kinetics Processes in Materials Engineering and Metallurgy”, Second Edition, Amir Kabir Pub Inst; Tehran, Iran, (2004), 145-156. 9. Vaezi, M.R. and Sadrnezhaad, S.K., “Highly Textured ZnO Thin Films: An Economical Fabrication, Doping by Mn2+ and Sn2+ and Approachment for Optical Devices”, Materials and Design, Vol. 28, (2007), 1065-1070. 10. Kalsi, P., “Spectroscopy of Organic Compounds”, Wiley Stern, New Delhi; India, (1985). 11. Chang, J.F., Kuo, H.H., Leu, I.C. and Hon, M.H., “The Effects of Thickness and Operation Temperature on ZnO: Al Thin Film CO Gas Sensor”, Sensors and Actuators B, Vol. 84, (2002), 258-264. 12. Ito, K. and Nakamura, K., “Preparation of ZnO Thin Films using the Flowing Liquid Film Method, Thin Solid Films, Vol. 286, (1996), 35-36. 13. Ristov, M., Sinadinovski, G.J., Grozdanov, I. and Mitreski, M., “Chemical Deposition of ZnO Films”, Thin Solid Films, Vol. 149, (1987), 65-71.