Solid‐State Dye‐Sensitized Solar Cells Combining a Porous TiO₂ Film and a Layer‐by‐Layer Composite Electrolyte

Layer-by-layer (LbL) deposition of polyelectrolytes is utilized to prepare solid-state dye-sensitized solar cells. Hydrophilic LbL films are treated at low pH to induce a microporous structure, and then infiltrated with TiO2 by liquid-phase deposition. The porous TiO2 layer (see graphic) is sensitized with dye and then coated with a solid polymer electrolyte. The conversion efficiency of this solid-state device is 1.1 %.