The Optimization Design And Research On The Photoanode Of Dye Sensitized Solar Cells

Dye sensitized solar cells?DSSCs?have aroused more and more concern because of the characteristics simple preparation process,low production cost,environmentally-friendly and relatively high photoelectric conversion efficiency in recent twenty years.The nanocrystalline TiO₂ film photoanode plays an important part in absorbing dye molecule,the light harvesting,the electron collection and transmission,which greatly influenced the photoelectric properties of the DSSCs.In order to largely improve the photoelectric conversion efficiency of the DSSCs,the optimized design of the TiO₂ film photoanode was needed.In this report,we have prepared TiO₂ photoanode with excellent performance,which is mainly through the morphology design of TiO₂ film photoanode that together with several different microstructures of TiO₂ nanometer film and make full use of the advantages on their morphologies.In addition,the Ag nanoparticles have been doped into the photoanode by ion doping.The Surface Plasmon Resonance Effect is used to improve the spectral absorption ability of DSSCs,formed by the interaction of the light wave with the electrons on the surface of Ag nanoparticles.The specific research contents and conclusions are as follows:?1?We have prepared the TiO₂ nanotube?TNT?arrays film by the anodic oxidation and synthesized the TiO₂ hollow boxes?TiO₂-HB?by hydrothermal synthesis.On the basis of the nanometer materials of the pure P25 nanoparticles,TNT arrays and TiO₂-HB,we have prepared the pure P25 nanoparticles film photoanode,the P25/TNT arrays double layer composite film photoanode with P25 as the underlayer and TNT arrays as the overlayer,the P25/TNT arrays/TiO₂-HB three layer composite film photoanode with P25 as the underlayer,TNT arrays as the interlayer and TiO₂-HB as the overlayer.Various test methods were used to characterize and analysis the photoandes.The research results show that P25/TNT arrays/TiO₂-HB three layer composite film photoanode obtained a higher efficiency of 6.03%compared to the P25/TNT arrays double layer composite film and the pure P25nanoparticles film photoanode,which is attributed to the interaction of the three morphologies,the P25 nanoparticles have large surface area contributes to dye adsorption,the tubular structure of TNT arrays provides direct pathways for electron transportation,the TiO₂-HB as the scattering layer enhances the light scattering capability.?2?We have prepared the P25/TNT arrays double layer composite film photoanode with different concentrations of Ag nanoparticles through irradiating five different concentrations of AgNO₃ solutions?0.01mol/L?0.02mol/L?0.03mol/L?0.04mol/L?0.05mol/L?by UV light.Compared to the untreated P25/TNT arrays double layer composite film photoanode,various test methods were used to characterize and analysis the photoandes.The experiment results show that the photoelectric conversion efficiency of the DSSCs have the trend of first rising and then falling,from no doped 3.00%up to 6.12%then down to 5.43%with the increase of doping concentration.The maximum is reached in the AgNO₃ solution concentration of 0.04mol/L.The reason is mainly that Ag nanoparticles will assemble into clusters,which can improve the dye adsorption amount,what's more,the Surface Plasmon Resonance Effect of the Ag nanoparticles can expand TiO₂ spectral response range,thereby improve the photoelectric conversion efficiency of the DSSCs.