Benzylphosphonic Acid‐Engineered Compact Self‐Assembled Monolayers for Bifacial Buried Interface Passivation in High‐Performance Inverted Perovskite Solar Cells

at the perovskite interface, significantly suppressing non-radiative recombination. Optimized Me-4PACz/BPPA-based PSCs achieve a champion power conversion efficiency (PCE) of 26.35%, while retaining 90% of the initial efficiency after 3000 h in a nitrogen atmosphere without encapsulation. This molecular co-assembly strategy concurrently refines HTL properties and buried interface passivation, providing a generalized approach for high-efficiency, stable PSCs.