Study On TiO₂ Based Dye-sensitized Solar Cells

Dye-Sensitized Solar Cells,referredDSSC)manufacturing process for its simple production、lowcost、abundant materials get more and more people’s attention. But,the photoelectric conversion efficiency of DSSC still far below its theoretical value, there is still space for improvement, photoanode as the most important component in DSSC,its performance will directly affect the DSSC’s photovoltaic. In this paper,TiO2 photoanode, using different methods to prepare different morphologies and TiO2 photoanode multilevel tructure, prepared by exploring higher performance TiO2 photoanode, main research contentsandresults are as follows:(1)TiO2 nanotube arrays were prepared by anodic oxidation method. The influence of electrolyte concentration, oxidation time and water content were studied on the nanotubes. When NH4F was 0.5 wt% in electrolyte concentrat ion, voltage 20 V, oxidation time 50 h, water content 1 wt%, the length, dia meter and wall thickness of the nanometer tube were about 2.41um,50 nm, and 10nm, which the photoelectric conversion performance of DSSC was bes t, closely 2.45%.(2) different morphologies of TiO2 powder wre prepared by hydrothermal and solvothermal, by comparing the performance of TiO2 powder, prepared by hydrothermal method is the best,the TiO2 nanopartical size is between 20-30nm, by at 500℃ to anatase, the highest photoelectric conversion efficiency reaching 6.41%. based on this,we research the scattering layer, dense layer and TiCl4 surface modification on DSSC performance, through the research found, in photoanode added to the surface of the anode layer 400-500nm of scattering layer can increase the utilization of the incident light, photoelectric conversion efficiency of the battery will increase by 17.9%, reaching 7.56%.(3) TiCl4 take modified on the sueface of TiO2 photoanode in DSSC,It can do better on adsorb dye, while TiCl4 treatment improve the TiO2 photoanode interfacial electron injection efficiency, increase the interfacial charge separation efficiency, improve the Jsc. reduced electron recombination rate of the electron density increases, the compensation due to the conduction band edge of change Voc consumption caused by the photoelectric conversion increase efficiency of 11%,get7.16%.(4) non-hydrolytic sol-gel method of TiO2 powder is applied to the dye-sensitized solar cell dense layer, when the dense layer thickness is 250nm, the heat treatment temperature is 550 ℃ insulation 15min, the Jsc is 15.54 mA ·cm-2, the Voc is 0.72V, FF is 0.7. The resulting photoelectric conversion efficiency of up to 7.89%, compared with non-dense layer of cells (efficiency of 6.41%) improved by 23.1%.(5)Though Alcohol calorimetry can get ZnO nanoball between 300-700nm in diameter by the particle diameter of about 20nm small particles of nanoparticles. Through hard template method with ZnO nanoparticles TiO2 spheres was prepared as a template. TiO2 ball are determined by the size of about 5nm small particles of TiO2. The preparation of TiO2 nanoparticles powder into light anodic films and assembled into DSSC, photoelectric conversion efficiency of the cell was 1.58%, Voc is 0.76V, Jsc is 3.41mA· cm-2, and FF get 0.61.