Dye-sensitised Cells Key Materials Research

Since the beginning of the21st century, with the development of human society, as well as rapid population growth, human demand for energy increasing from year to year. However, due to the traditional fossil energy is not renewable, so the effective use of renewable energy has become the problems to be solved. Solar energy is renewable energy development and utilization of the most active areas, and use of solar power generation is one of the main ways of utilization of solar energy. The early1990s Swiss Federal Professor Michael Gratzel developed a relatively cheap, simple process, with a higher photoelectric conversion efficiency and the environment free Dye-Sensitized Solar Cell (DSSC). After20years’rapid development, the photoelectric conversion efficiency has reached about12%. To further enhance the photoelectric conversion efficiency of DSSC devices, the key materials for DSSC were studied as follows:(1) Series of dye molecules based on porphyrin derivatives were designed, and synthesized. However, due to various factors many of our designed molecules are not synthesized, only some of the intermediate product.(2) Series triphenylamine-tetrathiafulvalene (TTF) based D-D-π-A dye molecules were designed, because of the structure the energy levels of dye molecules were lower and the absorption of light were moer efficiency. Gaussian03software package were uesd to analysis the properties of the molecules, it indicates that the molecules’ structures and absorption spectroscopy is very suitable for DSSC devices. Finally, we also synthesized the above molecules and applied in DSSC, these molecules show high photoelectric conversion efficiency.(3) Plasmon effects and titanium dioxide wrapped in zinc oxide (ZnO@TiO2) core-shell structure based DSSC photoanode were prepared. With the increase of the plasma particle content the efficiency of DSSC device improve, and the maximum efficiency is4.81%. With the increase of zinc oxide content the open voltage of the ZnO@TiO2based DSSC devices increased, while the short current decreased. In the future our work is to find a balance between the open voltage and short current by changing the content of zinc oxide.