Abstarct: Dye-sensitized solar cells (DSSC) are categorized in the 3rd generation of solar cells. In this classification, the organic dye which has been absorbed on the surface of the mextal oxide semiconductor thin film, absorbs sunlight and injects electrons into the conduction band of the mextal oxide semiconductor (photoanode). In this thesis, the titanium dioxide (TiO2) was used as a semiconductor which can be applied in dye-sensitized solar-cells as a photoanode. For this reason, thin films of TiO2 were grown using two methods of spray pyrolysis and hydrothermal and their different properties were studied. These films were coated using spray pyrolysis at the temperature of 150°C on top of both bare glass and FTO coated glass (as a conducting laxyer) substrate. The precursor solution for spray was made of (TTIP) as main material and Isopropanol as solvent. Sample were sprayed in two manners of pulsed and non-pulsed, and the solution was prepared at two volumes of 200 and 350 mL. Result showed that non-pulsed spraying gives better conductivity for prepared thin film, and this gets better with increasing the volume of solution. XRD pattern analysis revealed the formation of anatase crystal phase for both substrates at the volume solution of 350 mL. In hydrothermal method all thin films were grown on top of FTO coated glass using both titanium isoprppoxide (TTIP) and titanium tetrachloride (TiCl4) as precursor solutions. Growth were performed at 3 temperatures of 100, 115 and 130 °C. Formation of rutile phase was observed using XRD pattern analysis with preferred direction of (101) for all hydrothermal temperatures. Also, the effect of concentration of stabilizer agent, CTAB, as a surfactant was studied at the optimum temperature of 115 °C at 3, 6 and 13.5 M concentrations. FESEM images showed that by increasing the concentration of CTAB the surface morphology of thin film changes so that the number of nanoflowers decreases at the surface. However XRD pattern analysis confirms that the peaks intensified. UV-Vis spectroscopy, field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD) were utilized for the characterization of synthesized TiO2 thin films. In this thesis, synthesis and characterization of different properties of TiO2 for application in DSSCs was conducted.