Synergistic regulation of crystallization and the buried interface in Cs x FA 1− x PbI 3 perovskite photovoltaics using a multifunctional sulfonyl–ammonium additive

A multifunctional AEMS additive synergistically regulates the crystallization and buried interface of inverted Cs x FA 1− x PbI 3 perovskite solar cells, yielding a certified efficiency of 26.80% and robust long-term operational stability.