Organic Ionic Solid Electrolyte And Its Application In The Dye-sensitized Solar Cells

Since1991professor M. Gratzel firstly reported the Dye-sensitized solar cell (DSSC) which had solar-to-electricity conversion efficiency of7.1-7.9%, it has pointed to new train of thought for the development of DSSC owing to its simple structure, low cost, and easy fabrication. Untill now, the liquid electrolyte has been the most efficient hole-transport material in DSSC. However, it influences the long stability of DSSC due to the solvent volatilization and leakage. The thesis mainly study two different types of solid-stated electrolytes, and apply them in the dye-sensitized solar cells for the development of electrolytes with leak-free, high availability.Organic ionic plastic crystals [Choline][I] was synthesized and characterized by NMR, DSC. The organic ionic plastic crystal matrix was doped I2and DPMII to prepare the plastic crystal solid electrolyte which can be used in DSSC, and a series of test were studied for DSSC. Finally, the fabricated solid-state devices give an overall power conversion efficiency of about2.5%at70℃under simulated radiation (100mW/cm2). Furthermore, DSSC based on the organic ionic plastic crystals [Choline][I] electrolyte show excellent long-time stability at70℃. These results demonstrate a feasible approach to solid-state DSSC for practical outdoor application at high temperatures.The N-allylimidazole was introduced into the PMHS using the hydrosilylation, and then utilized quaternization reaction at the N atom. The novel functionalized polysiloxane was prepared after the above methods. The product had both the ionic liquid and the characteristics of polymer, and also was the main source of I-instead of inorganic salt. It solved the problem of poor compatibility of inorganic salt with polymer. We prepared the best electrolyte containing15wt%PAN. The optimalizing short current density and photoelectric conversion efficiencies of DSSC were10.4mA cm-2and1.73%, respectively.