Effect of thermal treatment on the properties of sol-gel derived Al-doped ZnO thin films

Citation:
Muşat, V. a, B. b Teixeira, E. b Fortunato, R. C. C. b Monteiro, and P. c Vilarinho. "Effect of thermal treatment on the properties of sol-gel derived Al-doped ZnO thin films." Materials Science Forum. 455-456 (2004): 16-19.

Abstract:

This paper presents preliminary results on Al doped ZnO thin films prepared by the solgel method. The thin films were produced by a dip-coater technique on glass substrate, using zinc acetate dihydrate, aluminium chloride hexahydrate, 2-methoxyethanol and monoethanolamine as raw materials. The ZnO thin films were analysed by XRD, Hall effect and SEM measurements. In order to determine the influence of the thermal treatments on the film properties, a set of four different heat treatments (atmosphere and temperature) were studied. All the films are polycrystalline presenting a crystallographic c-axis orientation (002) perpendicular to the substrate. The best results were obtained for films pre-heated at 400°C and post-heated for 1 hour in air at 600°C, after annealing under a reduced atmosphere of forming gas, where a resistivity of 3.9×10-3 Ωcm, a Hall mobility of 34.1 cm2/Vs, a carrier concentration of 4.7×1019 cm-3 and an optical transmittance of 90% were achieved.

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