Analysis of Dominant Factors for Increasing the Efficiencies of Dye-Sensitized Solar Cells: Comparison between Acetonitrile and Ionic Liquid Based Electrolytes

摘要

Factors determining the photovoltaic performance of cells containing ionic liquid based electrolytes are compared with those of cells containing acetonitrile based electrolytes. The difference is made clear by using a simulation model having a bulk electrolyte layer. In the former case, ionic diffusions in bulk electrolytes determine photocurrents. In contrast, in the latter case, electron diffusion in nano-porous TiO_2 layers determines the photovoltaic performances. The increase in photocurrents for the former cells would be made most effectively by increasing ionic diffusions in electrolytes.