Aqueous Dye‐Sensitized Solar Cell Electrolytes Based on the Ferricyanide–Ferrocyanide Redox Couple

Solar energy conversion efficiencies of over 4% have been achieved in DSCs constructed with aqueous electrolytes based on the ferricyanide-ferrocyanide redox couple, thereby avoiding the use of expensive, flammable and toxic solvents. This paradigm shift was made possible by the use of a hydrophobic organic carbazole dye.