The nanocrystalline materials and films have been shown extraordinary optical and electronic properties so could be applicable to photovoltaics, photocatalysis, electrochromism, and electroluminescence. Especially, nanocrystalline TiO₂ for photochemical solar cells based on dye-sensitized solar cells (DSSCs) has been focused and investigated. Porous network of nanocrystalline TiO₂ in solar cell using glass coated with tin-doped indium oxide (ITO) was usually achieved by sintering at 450 - 500 ℃. However, this thermal treatment could not be applied to prepared the porous network of TiO₂ in flexible solar cell because of thermal degradation of flexible substrate. Alternative ways such as thermal treatment around 120 ℃ or compression were employed for achieving the porous network of nanocrystalline TiO₂ in flexible solar cell. TiO₂ suspension was spreaded using spin-coating or doctor-blade technique for preparation of porous TiO₂ photo-electrode. In this work, Electrophoretic deposition (EPD) combined with compression was employed for preparation of TiO₂ photo-electrodes. EPD represents a materials processing technique in which charged particles in a suspension including electrolyte, particles, and solvent are moved toward the oppositely charged electrode and are then deposited onto a substrate under an applied DC electric field. In this work, typical electrophoretically deposited nanocrystalline TiO₂ films showed poor optical and electronic properties, however, the properties of films were changed after compression. The light-harvesting or absorption of nanocrystalline TiO₂ films were created or much increased after compression without thermal treatment. So the electrophoretically deposited nanocrystalline TiO₂ could be applicable for the flexible dye-sensitized solar cell.