OZONE TREATMENT OF NANOSTRUCTURED TITANIUM DIOXIDE THIN FILMS FOR DYE-SENSITISED SOLAR CELLS APPLICATIONS

摘要

Surface modification of titanium dioxide(TiO2)layers and powders by ozone was performed.Thin nanostructured TiO2 layers were deposited on conductive glass substrates and treated with an ozone-oxygen mixture with various ozone concentrations.A powder sample of titanium dioxide was ozonised in a bubbling reactor.The kinetics of oxidation processes both for powder and thin-film TiO2 samples has been studied and the rate constants of oxidation for two systems were determined.The optical characteristics of ozone-treated TiO2 were investigated by UV-vis.and infrared spectroscopy.The formation of the main oxidation products for powder and thin-film TiO2 samples has been studied.It was shown that ozone treatment increases the specific surface of the samples and accordingly increases the adsorption of the ruthenium dye(N719)in the bulk of the nanostructured TiO2 layer.Obtained results indicate that ozone-treated TiO2 layers could be used as photoelectrodes for high-efficient dye-sensitised solar cells(DSSCs).