Study On Characteristics For The Anode Of Dye-sensitized Solar Cells

Dye-sensitized solar cell （DSSC） is a new type of photoelectric chemical solarcell with low cost, simple preparation procedure, stable photoelectric performance,high photoelectric conversion efficiency and friendly environment action, which has agood prospect in the research of solar cell. Because of a further higher efficiency andlower cost, the solar cell based on nano-semiconductor materials and technologybrings a large range of attention. This paper focus on the performance for the anode ofthe DSSC, and we study the effect of the key components to photoelectric property ofthe DSSC, including nanoporous TiO₂films, redox electrolyte and counter electrode,in order to obtain a high conversion efficiency.Mixed P25TiO₂with ethyl cellulose and terpineol, via high-energy ball milling,rotary evaporation and grinding to manufacture the slurry of TiO₂with the properconcentration, and then the films of TiO₂photoanode are prepared by the screenprinting method. The impact of coating thickness, the treatment of TiCl₄solution andlight scattering layer are also discussed. After double screen printing, twice treatmentof TiCl₄and coating the DHS-Nano T200as the light scattering layer, the TiO₂photoanode exhibits a photoelectric conversion efficiency of6.05%.Under low temperature conditions, ZnO nanoparticles are fabricated by thehydrolysis of zinc acetate in lithium hydroxide solution in an open container. Thoseobtained particles with high purity and crystallization are applied to the DSSC, andmake a photoelectric conversion efficiency of2.47%. When the content of nano-ZnOis20%, the photoanode preparated by the complexes of the ZnO nanoparticles andP25TiO₂obtains a photoelectric conversion efficiency of6.44%.The anatase TiO₂hollow spheres with a diameter of approximately250nm weresynthesized by a chemical template method. Compared to conventional P25nanocrystalline particles, the TiO₂hollow structured materials not only have a lowdensity, high specific surface areas, and hierarchically porous structures but alsoexhibit high light-scattering efficiency and fast motion of the charge carriers. Aphotoelectrode consisting of TiO₂hollow spheres for use in dye-sensitized solar cell（DSSC） is prepared, and the nanostructure and the performance of DSSC with anionic liquid electrolyte are investigated. Improved performance of the DSSC （η=3.79%） is obtained compared with the P25TiO₂nanocrystalline.The flexible DSSC is manufactured by the method of combining electrophoreticdeposition with mechanical compression on a flexible ITO/PET conductive substrate,and the influence of the different conductive substrates and mechanical stress on thephotoelectric performance of DSSC is investigated. Ultimately, a photoelectricconversion efficiency of1.82%is obtained by the flexible DSSC.