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Effect of annealing on photoluminescence property of nano particle composite ZnO films

The effect of annealing temperature on the structural as well as photoluminescence (PL) properties of the nanocrystalline ZnO films deposited by sol-gel process has been investigated. The as-deposited film is amorphous in nature, and the crystallinity as well as grain sizes have been found to increase on post-deposition annealing. PL intensity is greatly improved with the increase in annealing temperature, and the band gap of ZnO films is red-shifted. A correlation between the structural and optical properties has been investigated in detail.