Abstract
The formation of photoconducting ZnO films from chemically deposited ZnS films by air annealing is reported. The ZnS to ZnO conversion was confirmed by x-ray diffraction (XRD) and optical studies of the films. As-deposited films exhibited very little dark conductivity and no photoconductivity. Air annealing of the films at about 400 degrees C for at least 15 min converted them to ZnO films with higher dark conductivity and photoconductivity. Repeated deposition improved the dark conductivity of the as-deposited films and dark conductivity and photoconductivity of the annealed films. The value of the photo- to dark conductivity ratio depends on the annealing time and temperature. These characteristics of ZnO films may be exploited for their potential application in low-cost solar cells and photodetectors.
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