Preparation Of TiO₂Nanorod And Its Application In Dye-sensitized Solar Cells

With the development of the society, energy and environment issues havebecome the most important issues which human beings are facing in21st century, anew form of energy without pollution----solar energy, start to comes into our sight.Since O’Regan and Gr tzel in1991introduced nanosrystalline mesoporoustitanic with high surface area into dye-sensitized solar cells (DSSCs) and achieved anoverall light-to-electric energy conversion efficiency of7.12%at full sunlight(AM1.5). In the past three decades, lots of researches have been devoted to structuraldesign, material fabrication, photovoltaic characterization and mechanism analysis ofTiO2nanoparticle-based solar cells. As far as the film electrode is concerned, TiO2nanorod arrays have potential application in DSSCs due to their properties of higherelectron diffusion coefficient, higher specific surface area, suppress the recombinationof charge carriers with redox species. In this thesis, valuable explorations have beencarried out on the preparation of TiO2nanorod arrays, adjusted and optimized thegrowth process, doping Zn element into TiO2nanorod arrays, then, improve theconversion efficiency.1. TiO2nanorod arrays were prepared using hydrothermal synthesis method onthe FTO substrate, combine XRD and SEAD to analysis the TiO2nanorod arrays. Theresults confirm that the TiO2nanorod is rutile, and the TiO2nanorod is single crystal.We find that different concentration and muticle hydrothermal influence themorphology of the TiO2nanorod arrays. Improving the concentration and muticlehydrothermal times to a appropriate value could enhance the the photoelectricproperties of the cell.0.5,1.0,1.2ml Titanium source could reach1.42%,1.56%,0.77%, respectively.2. We try to study the influence of different concentration and muticlehydrothermal on the morphology of the TiO2nanorod arrays, cell optical andelectrical properties. The results indicate that TiO2nanorod arrays nucleate in0.5mltetrabutyl titanate, grow in0.3tetrabutyl titanate, and reach the optimum performanceof1.92%.3. The TiO2nanorod arrays were modified by the Zn, Fe, Li element doped. TheZn element colud improve the cell performance to1.61%. The result is higher than Feand Li. We explain that how the Zn element improve the cell performance. Use SEMand XPS image to analysis the appearance and structure, the IV, EIS, UV-VIS toresearch the cell performance with Zn doped. The above results indicate that a certain content of Zn doped will improve the absorption of sunlight of the TiO2nanorodarrays in400-800wavelength range.