Abstract
The properties of AZO (98-wt% ZnO, 2-wt% Al2O3) films produced in pure Ar and Ar (98%) + H2 (2%) (H2-diluted Ar) by radio-frequency (RF) magnetron sputtering were investigated as functions of the substrate temperatures. H2-diluted Ar improved the electrical properties of the AZO films fabricated at low substrate temperatures, but this benefit gradually diminished with increasing substrate temperature. This phenomenon was explained by O-H stretching in the Zn-O bond at low temperatures and by the formation of oxygen vacancies at high temperatures. The average optical transmission was over ~85%, and the orientation of the AZO films deposited both in pure Ar and in H2-diluted Ar was in the [002] direction.
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