Preparation and Optimization of Nanostructured TiO₂ Thin Films for Dye-Sensitized Solar Cell Applications

抄録

TiO₂ nanowires and nanorods were prepared on ITO coated glass substrates by hydrothermal method. TiO₂ films were prepared under different preparation conditions. In this paper, effect of growth conditions on the surface morphological and structural properties of anatase and rutile TiO₂ films was studied. XRD results showed that the pure rutile TiO₂ phase was grown in HCl medium. In contrast, pure anatase TiO₂ phase was grown in HNO₃ medium. The crystallinity of TiO₂ films increased as the reaction temperature was increased from 120 to 160°C. The phase transformation from rutile to anatase was observed when the volume concentration of titanium n-butoxide (TNB) increased from 0.5 to 1.0 ml. Scanning electron microscopy images showed that the morphology of the final product was strongly dependent on the experimental parameters, such as volume of HCl and annealing temperatures. The nanostructured TiO₂ films fabricated by hydrothermal method can be used for dye-sensitized solar cell applications.