Preparations and Characterizations of TiO2 Pastes for Flexible Dye-Sensitized Solar Cells

New TiO2 pastes for the fabrication of TiO2 electrodes at low temperature were prepared from a TiO2 nanoparticle colloidal solution including Ti-alkoxide precursors. In addition, TiO2 pastes comprising 123 nm and 200 nm TiO2 particles used as scattering particles were prepared. Single and double layered TiO2 electrodes were deposited onto an ITO-PEN film by the doctor-blade method and subsequently sintered at 140 degrees C and used to fabricate flexible Dye-sensitized Solar Cells (DSSCs). Due to the light scattering effect in the double layered TiO2 electrode, the J(sc) and efficiency of the flexible DSSCs were greatly enhanced.