Preparation And Characterization Of Anodic Film With Multistage Structure

Dye sensitized solar cell （DSSC） gets fast development in many types of solarcells, because of a wide source of raw materials, simple technology and ultra-lowcost. It has become a new research hotspot of new energy in various countries. Butthere are a lot of problems to further study. It can improve the photoelectricconversion efficiency of DSSC, because of nanorods, nanotubes and nanowires suchone dimensional structure with large length to diameter ratio and high electrontransmission, reducing the recombination rate of photoproduction electronic andholes, effectively improving the utilization rate of photoproduction electronic.In this paper, we prepared the nanometer TiO₂sol and TiO₂nanorods throughthe hydrothermal method and sol-gel method. TiO₂nano-particle porous films andcomposite film of TiO₂nanorods were prepared by using electro-hydrodynamictechnique （EHD）, with Nanometer TiO₂coating film sol cooperating hydrothermalcolloidal sol with organic polymer dispersing agent （PVA）. The characteristics of thefilms are investigated by using XRD, TEM and SEM. The DSSC devices wereassemblied with thin film by N3dye sensitization, ionic liquid electrolytes, platinumcounter electrode, and the photoelectric properties were tested.The anatase TiO₂nano-particles by hydrothermal method are about graindiameter of20nm with grain size uniformity and crystallinity integrity. The anataseTiO₂nanorods synthesized by hydrothermal method are about20³0nm in diameterand100³00nm in length. TiO₂nano-particle films and composite film of TiO₂nanorods possess pore structure with continuous size distribution in the range ofnano-scale to micro-scale, with multi-porous structure. Under illumination ofsimulated AM1.5solar light （100mW/cm2）, the overall energy conversion efficiency of6.40%is obtained for the DSSC device prepared with the composite film withTiO₂nanorods mass content of20%, the photoelectric conversion efficiencyincreased by28%, relative to the nanometer TiO₂thin film （5.0%）.