Nanoscale Perovskite‐Sensitized Solar Cell Revisited: Dye‐Cell or Perovskite‐Cell?

A general and straightforward way of preparing few‐nanometer‐sized well‐separated MAPbI(x)Br(3−x) (MA=methylammonium) perovskite photosensitizers on the surface of an approximately 1 μm thick mesoporous TiO(2) photoanode was suggested through a two‐step sequential deposition of low‐concentrated lead halides (0.10–0.30 m PbI(2) or PbBr(2)) and methylammonium iodide/bromide (MAI/MABr). When those nanoscale MAPbI(x)Br(3−x) perovskites were incorporated as a photosensitizer in typical solid‐state dye‐sensitized solar cells (ss‐DSSCs), it could be verified clearly by the capacitance analysis that nano‐particulate MAPbI(3) perovskites play the same role as that of a typical dye sensitizer (MK‐2 molecule) although their size, composition, and structure are different.