Study On Advanced Photo Anode And Solid Electrolyte In Dye-sensitized Solar Cells

Dye-sensitized nanocrystalline TiO2solar cell(DSSC) is a new type of thePhotoelectrochemical solar cell. Because of its simple fabrication procedure,low cost,betterstability and clean energy, DSSC solar cell has arouse world researches and applicationprospect.The results are significant on the fields of semiconductor optoelectronics,nanoporousmaterials and solar cells. Photovoltaic performance of the nanoporous TiO2films is closelyrelated with chemical composition, energy band structurethe, number of oxygen vacanciesand crystallinity of nanosized TiO2particles. Photovoltaic performance of the singlenanoporous TiO2films is unsatisfactory, Suitable metal ion doping and semiconductor ofdifferent level nano-particles composite can improve the photoelectric properties of theelectrode. In this paper, We have studied the preparation of light anode of Dye-sensitized solarcell and doped with spinel nanometer powders.Nanosized TiO2particles with different crystallization are prepared by hydrothermalmethod under different temperature conditions. These nanoporous TiO2films are applied todye-sensitized solar cell module. We obtained the best preparation process of preparation ofTiO2nano-particles by hydrothermal method. On this basis, Spinel Zn2SnO4nanoparticleswere prepared by hydrothermal method. It was doped in titania powder and Zn2SnO4/TiO2composite film electrodes were prepared on FTO glass substrate by screen printing method.Zn2SnO4with wide band gap semiconductor doped in TiO2composites can generateenergy-band coupling effect to separating the electron and hole away from each other of thecomposite film. The effects of processing parameters on properties of Zn2SnO4/TiO2composite film electrodes are studied and mechanism of composite film is discussedfundamentally.The result shows: under the condition of Hydrothermal reaction temperature200℃andholding time8h, we prepare TiO2nanoparticle with good crystallinity and moderate grain size.The nanoporous TiO2films applied to dye-sensitized solar cell module get better photovoltaicperformance compared with the P25powder. TiO2composite films doped with Zn2SnO4nanoparticles were superior in Open circuit voltage. When the content of Zn2SnO4was3%, composite film electrodes have preferable photoelectric properties and Open circuit voltagehave increased15.4%and reached0.884V. Photoelectric conversion efficiency increased9.3%, Fill factor increased47.6%.