All‐Solid‐State Dye‐Sensitized Nanoporous TiO₂ Hybrid Solar Cells with High Energy‐Conversion Efficiency

Homogeneous nanoporous TiO2 films with controlled architecture, porosity, and layer thickness (see figure) have been prepared by the sol–gel methodology to optimize the efficiency of solid-state dye-sensitized solar cells. Using regioregular poly(3-octylthiophene) as a hole conductor, a high solar-conversion efficiency associated with excellent stability under light and air exposure has been achieved.