Abstract
The photoluminescence properties of spray pyrolyzed strontium (Sr) doped tin oxide (SnO2:Sr) thin films are presented. These transparent nano-films are found to have polycrystalline tetragonal structure. A nano-needle like grains were observed up to 1 wt% Sr doping, whereas polyhedron like grains were seen at 1.5 wt% of Sr doping. A redshift of 110 meV in the optical bandgap was obtained for SnO2:Sr(1 wt%) thin film and is attributed to defect states induced and reorientation effect caused upon Sr doping. The improvement in n-type conductivity observed for 1 wt% Sr doped tin oxide thin films is ascribed to increase in the carrier concentration and mobility. The observed increment in the intensity of visible emissions in SnO2:Sr (1 wt%) films is attributed to oxygen vacancy related recombination on Sr doping. Obtained results of SnO2:Sr are compared with those of pure SnO2 film and we find enhancement in the photoluminescence intensity when doped with Sr.
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