This work introduces an aprotic sulfonium buffer layer at the nickel oxide–perovskite heterojunction to eliminate the multi-step photochemical reactions, which leads to inverted perovskite solar cells with long-term operational stability.

A benzo[rst]pentaphene (BPP) substituted by two bis(methoxyphenyl)amino (MeOPA) groups (BPP-MeOPA) was synthesized and clearly characterized by NMR and single-crystal X-ray analysis. Detailed investigations of its photophysical properties, including transient absorption...