Optimum Nanoporous TiO₂ Film and Its Application to Dye-sensitized Solar Cell

Properties of TiO₂ nanoporous films, which are one of the crucial technologies in dye-sensitized solar cell, are investigated. The nanocrystalline TiO₂ films were prepared with the sol-gel method at different pH in precursor and treatment temperature in autoclave for their application to dye-sensitized solar cells. The thickness of the TiO₂ film is very important to the transfer of photoelectron as well as adsorption of dye, it is also known as one of the source to the dark current. The results show that the TiO₂ films, such as different particle sizes of TiO₂, different pH in precursor and treatment temperature in autoclave, have a strong influence on the photoelectrochemical properties of the dye-sensitized solar cells. We give the optimum TiO₂ film thickness and morphology for the application to dye-sensitized solar cells.