Hybrid structure of TiO2nanofiber and nanoparticle as a photoelectrode was very attractive in dye-sensitized solar cells (DSCs) because TiO2nanoparticle provided a high specific surface area to adsorb the N719 dye and TiO2nanofiber was a direct path to transfer photoelectron from dye to electrode. TiO2nanofiber film was prepared with titanium-tetraisopropoxide (TTIP) and polyvinylpyrrolidone (PVP) based precursor by electro-spinning process. To fabricate the hybrid structure, TiO2nanoparticular paste was screen printed on the TiO2nanofiber film. Electrospun TiO2nanofiber film and screen printed TiO2nanoparticular film were combined in layer by layer method. These films were observed as an anatase phase by X-ray diffraction pattern. Thickness and diameter of TiO2nanofibers were ~5μm and ~400nm, respectively. Thickness and particle size of TiO2particles were ~5μm and ~20nm, respectively. Compared to conventional DSCs, higher short circuit current densities (Jsc) of 6.47 mA/cm2and higher power conversion efficiency of 3.06 % were measured in DSCs having hybrid structure of TiO2nanofiber and nanoparticle. Electrochemical impedance spectroscopy (EIS) was observed to understand an electron transfer and life time.
Influence of Screen Printed Nanowires/Nanoparticles TiO2 Nanocomposite Layer on Properties of Dye-Sensitized Solar Cells
