Synthesis and Properties of ZnO/Al Thin Films Prepared by Dip-Coating Process

Inna Juhnevica, Marija Masonkina, Gundars Mezinskis, Aļona Gabrene


In this work sol–gel dip-coating technique was used to synthesize ZnO and ZnO/Al films. The influence of annealing regime and dopant concentration on the structural properties of ZnO and aluminum doped ZnO (ZnO/Al) films was investigated. The surface morphology and crystallinity of ZnO films were determined using atomic force microscopy and Xray diffraction, respectively. The experimental results show that ZnO and ZnO/Al films prepared using “shock” conditions have smooth surfaces and uniform grains. Increase of aluminum concentration led to grain size reduction and denser film.


ZnO/Al, thin film, dip-coating, annealing conditions.

Full Text:



Rajesh S., Ganesh T., Xavier F.P. Thickness dependent microstructure, optical and photo conducting properties of ZnO thin films prepared by spin coating process. Journal of Electron Devices, 2013, vol. 17, pp. 1417–1422.

Shrestha S.P., Ghimire R., Nakarmi J.J., Kim Y.S., Shrestha S., Park C.Y., Boo J.H. Properties of ZnO:Al films prepared by spin coating of aged precursor solution. B Korean Chem. Soc., 2010, vol. 31, pp. 112–115.

Wang Q., Qin Y., Xu G.J., Chen L., Li Y., Duan L., Li Z.X., Li Y.L., Cui P. Low-voltage ZnO varistor fabricated by the solution-coating method. Ceramics International, 2008, vol. 34, pp. 1697–1701.

Krishnamoorthy S., Iliadis A.A. Properties of High Sensitivity ZnO Surface Acoustic Wave Sensors on SiO2/ (100) Si Substrates. Solid-State Electronics, 2008, vol. 52, pp. 1710–1716.

Jia C.L., Wang K.M., Wang X.L., Zhang X.J., Lu F. Formation of caxis oriented ZnO optical waveguides by radio-frequency magnetron sputtering. Optics Express, 2005, vol. 13, pp. 5093–5099.

Wienke J., van der Zanden B., Tijssen M., Zeman M. Performance of spray-deposited ZnO:In layers as front electrodes in thin-film silicon solar cells. Solar Energy Materials and Solar Cells, 2008, vol. 92, pp. 884–890.

Guo J., Zheng J., Song X., Sun K. Synthesis and conductive properties of Ga-doped ZnO nanosheets by the hydrothermal method. Mater. Lett., 2013, vol. 97, pp. 34–36.

Wu F., Fang L., Pan Y.J., Zhou K., Ruan H.B., Liu G.B., Kong C.Y. Effect of annealing treatment on structural, electrical, and optical properties of Ga-doped ZnO thin films deposited by RF magnetron sputtering. Thin Solid Films, 2011, vol. 520, pp. 703–707.

Wu Z.Y., Cai J.H., Ni G. ZnO films fabricated by chemical bath deposition from zinc nitrate and ammonium citrate tribasic solution. Thin Solid Films, 2008, vol. 516, pp. 7318–7322.

Zhang D.H., Yang T.L., Wang Q.P., Zhang D.J. Electrical and optical properties of Al-doped transparent conducting ZnO films deposited on organic substrate by RF sputtering. Mater. Chem. Phys., 2001, vol. 68, pp. 233–238.

Zi-Neng N., Kah-Yoong C., Thanaporn T. Effects of annealing temperature on ZnO and AZO films prepared by sol–gel technique. Appl. Surf. Sci., 2012, vol. 258, pp. 9604–9609.

Rozati S.M., Akesteh Sh. Characterization of ZnO:Al thin films obtained by spray pyrolysis technique. Mater. Charact., 2007, vol. 58, pp. 319–322.

DOI: 10.7250/msac.2015.006