Fabrication of Dye Sensitized Solar Cell Using Nanocrystalline TiO2 and Optical Characterization of Photo-Anode
نویسندگان
چکیده
Anatase phase containing nano-crystallite TiO2 thin film is prepared by the peptization of modified Ti-isopropoxide sol using HNO3 as peptizing agent. The resulting sol is concentrated in a rotary evaporator bath. TiO2 film is deposited on ITO substrate by spin coating process. The compact film is annealed at 450 ̊C and 500 ̊C for optical studies. The subsequently it is modified as photo-anodes in dye sensitized solar cells. The prepared materials are characterized by X-ray diffraction (XRD), UV-Vis absorption spectroscopy and high resolution transmission electron microscopy (HRTEM). The colloidal particles are 6-8nm in average size while the grain growth of the particles are in the order of 13-20nm after annealing of the thin film. The obtained lattice constants of the TiO2 nanocrystals are a=3.79Å and c=9.48Å from XRD data as compared to JCPDS data of a=3.79Å and c=9.52Å. The photo conversion efficiency of assembled dye sensitized solar cells comprising of ~5μm thickness of the film are determined to be of the order of 6.77%.
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