Influence of Al concentration on structural and optical properties of Aluminum doped zinc oxide thin films prepared by sol gel spin coating method

S Shankar, M Saroja, M Venkatachalam, M Balachander, V Kumar

Abstract


Al doped ZnO thin film can be employed as the transparent conducting oxide (TCO) in solar cell application , due to its advantage of low cost, high productivity, and excellent electrical conductivity. Multilayer Aluminum doped Zinc oxide(AZO) thin films have been prepared on glass sub strates by sol gel spin coating method. Zinc acetate solutions of 0.5M dissolved in isopropylalcohol stabilized by Monoethanolamine and doped with a concentrated solution of aluminum chloride in isopropylalcohol were used. The content of aluminum in the sol was varied from 1to 3 at% and spin coated at 2000 rpm for 30s.After each deposition the films were per-heated at 200°C for 10 minutes and annealed at 450°C in air atmosphere for 60 minutes. The structural properties were investigated by using X-ray diffraction technique. Absorbance spectra were measured by using UV-Vis spectrophotometer and the optical band gap was calculated. The influence of Al concentration on structural and optical properties were reported.

Keywords


Transparent conducting oxide, Aluminum doped Zinc oxide, sol-gel spin coating, structural and optical properties.

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