The effect of different annealing temperatures on the structure, morphology, and optical properties of ZnO thin films prepared by the chelating sol-gel method was investigated. Zinc-oxide thin films were coated on quartz glass substrates by dip coating. Zinc nitrate, absolute ethanol, and citric acid were used as precursor, solvent, and chelating agent, respectively. The results show that ZnO films derived from zinc-citrate have lower crystallization temperature (below 400°C),and that the crystal structure is wurtzite. The films, treated over 500°C, consist of nano-particles and show to be porous at 600°C. The particle size of the film increases with the increase of the annealing temperature. The largest particle size is 60 nm at 600°C. The optical transmittances related to the annealing temperatures become 90% higher in the visible range. The film shows a starting absorption at 380 nm, and the optical band-gap of the thin film (fired at 500°C) is 3.25 eV and close to the intrinsic band-gap of ZnO (3.2 eV).
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