Ion‐Defect Dual Management for Achieving Efficient Air‐Processed Perovskite Solar Cells With Certified Efficiency 27.1%

ABSTRACT Achieving high‐efficiency and durable perovskite solar cells (PSCs) under ambient fabrication remains a fundamental challenge due to the coupled instabilities arising from halide redox chemistry and Pb‐related defects. Here, we introduce a molecular “ion–defect dual‐management” strategy using N‐Acetylsulfanilyl Chloride (ABSC) that simultaneously regulates iodide redox species in precursor solutions and passivates electronic imperfections in the crystallized films. ABSC selectively induces the in situ formation of I 3 − without FA + deprotonation, while its multidentate functional groups strongly coordinate with undercoordinated Pb 2+ to suppress deep traps and enhance crystallinity. This synergistic…

• NN
  National Natural Science Foundation of China

  Awards: U21A2076, 52473257
• NS
  Natural Science Foundation of Hebei Province

  Awards: E2024202300, E2024202086