Preparation And Performance Optimization Of Anatase Phase Titanium Dioxide Photoanode

With the economic development and social progress, people's demand for energy is increasing gradually. However, the fossil energy is non-renewable, and polluting the environment, threatening the survival of the human environment. At present the development and use of new energy is an effective way to solve the energy crisis and environmental pollution. Solar energy is inexhaustible, inexhaustible clean energy, solar cell is the most important and effective way for the solar utilization. In the existing solar cells, the dye sensitized solar cells have been paid more attention by researchers because of their simple preparation process, low investment cost, low environmental pollution and so on. At present, the largest photoelectric conversion efficiency of DSSC packed by the photoanode structure is the nano particle structure, but in its working process, there are many energy losses, for example, charge recombination, electronic traps, etc. In this aspect, one dimensional nanostructures can increase the diffusion length of electrons, reducing the charge recombination and so on, which can improve the energy loss of DSSC. But for the one-dimensional nano structure, although the electron diffusion length has reached 100?m, but the photoelectric conversion efficiency is still much lower than the photoelectric conversion efficiency of the nanoparticles. This is due to its limited surface area, how to maintain the characteristics of one dimensional nanostructure, to improve the cell specific surface area is the main purpose and the research work of this paper mainly is the following aspects:1. The novel 3D nest-like structure film. First of all, anatase nano array structure film was prepared by hydro thermal method, and the 3D nest-like structure was prepared by adding the number of hydrothermal cycles. The role of the diethylene glycol in the reaction was explained in detail. By structural characterization and photoelectric chemical properties test, it is found that the novel 3D nest-like structure has a high specific surface area, which can effectively improve the dye adsorption capacity of the photoanode, and has good light scattering properties. In the end, the novel 3D nest-like structure film is assembled into a cell to obtain a better photoelectric conversion efficiency (3.81%).2. Cluster-net bilayer nano structure thin films. In the process of preparing anatase phase nano array structure, the cluster-net bilayer structure was prepared by adding different amounts of hydrogen peroxide as additive, and the formation mechanism of the morphology was analyzed. Cluster-net bilayer nanostructure film showed the better photoelectric conversion efficiency (4.94%), because of its dye adsorption capacity, faster electron transfer, superior light scattering and more electronic transmission path.3. Shuttle-like nano structure film. By adding different amounts of ammonium sulfate in the reaction precursor solution, and adjusting the reaction temperature and reaction time, successfully preparing shuttle-like nano structure film on the transparent conductive glass. The formation mechanism of the morphology was analyzed, and the effect of ammonium sulfate on the reaction was discussed. Shuttle-like nano structure film showed the better photoelectric conversion efficiency (6.40%), shuttle-like nano structure film has better dye adsorption capacity and superior light scattering compared with nanorods, shuttle-like nano structure film has faster electron transfer and more electron transport paths compared with nano particles, It is very good to play the synergy between different structures.