F for Fantastic: Fostering Stability and Efficiency in Perovskite Solar Cells via Comb‐Like Perfluoroalkyl‐g‐Polyethylenimine Additive

Additive engineering has emerged as a promising strategy to address the inherent instability challenges of perovskite solar cells (PSCs) in the pursuit of commercial viability. However, achieving multifunctionality using a singular additive remains a considerable challenge. In this study, a novel comb-like multifunctional perfluoroalkyl-g-polyethylenimmonium iodide (FPEI·HI) as additives to the PbI