Abstarct: In recent years, dye sensitized solar cells (DSSC) are considered as a promising candidate for the development of next generation solar cells because they can be fabricated by simple and low cost techniques. TiO2 in forms of nanostructured thin film or powder is the most successful photoanode in DSSC’s. In this experimental thesis, TiO2 photoanode was synthesized using spray pyrolysis and hydrothermal methods, and it’s structural, optical and morphological properties have been studied. Synthesized samples were characterized using field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), UV-Vis spectroscopy, solar simulator and PV-IV measurement system. For utilizing spray pyrolysis technique, three solutions with different concentrations of 4, 8 and 12 M were prepared. FESEM images of synthesized thin films revealed their sponge-like surface. The thickness of these samples were estimated, by FESEM system, to be 4.43, 4.05 and 1.51 nm for samples prepared using 4, 8 and 12 M of precursor solution concentrations, respectively. XRD pattern analysis showed that these samples have been grown in tetragonal crystal structure in anatase phase. Band gap of the samples was increased from 3.4 to 3.58 eV by increasing in the precursor solution concentration amount. Sample 4 M, which had better porosity, was used for the fabrication of solar cell device. The efficiency and filling factor of this device were measured to be about 4.27 and 0.44, respectively. Also, TiO2 nanopowder was synthesized using hydrothermal method. FESEM images showed the formation of nanoparticles with the mean grain size of about 15 nm. XRD pattern revealed growth in both anatase and rutile phases, with rutile as a major phase. Band gap of the sample was calculated to be about 2.2 eV. Then, this photoanode was utilized for the fabrication of solar cell device and the efficiency and filling factor of this device were measured to be about 0.424 and 0.65, respectively. Finally, with the aim of increasing in the performance of TiO2 as a photoanode, aluminum nitrate (1 and 1.5 mol%) was added to the precursor solution as dopant. Grain size was decreased to about 5 nm by increasing in the dopant amount. Also, band gap of sample was increased from 1.5 to 2.52 eV by increasing in the amount of impurity.