Higher quantum efficiency and moisture resistance of all-inorganic halide perovskite nanocrystal films in situ fabricated with cyclodextrin.

Supermolecule ß-cyclodextrin was used to assist CsPbBr3 film fabrication. In situ growth of nanocrystals was effectively confined through strong interactions between perovskite Pb2+ ions and ß-CD hydroxyl groups, producing a compact and smooth film. The quantum efficiency achieved was 85.3% with a moisture resistance over months, exceeding the record of perovskite films.