Solid State Dye-Sensitized TiO2 Solar Cell with Polypyrrole as Hole Transport Layer

Solid type dye-sensitized solar cell was fabricated using photodepositing polypyrrole onto the surface of porous TiO2 electrode anchored by photosensitizing molecules of a ruthenium complex. Polypyrrole in the porous medium successfully works as hole transport layer connecting the sensitizer dye molecules to a counter electrode. Doping density of the polypyrrole conducting layer was optimized to improve the efficiency of the system.