Compacting Molecular Stacking and Inhibiting Self‐Aggregation in Fullerene Transporting Layer for Efficient and Stable Perovskite Solar Cells

), lower trap density, more uniform film morphology, and superior defect-passivation ability, compared to the PCBM pristine one. Consequently, PSCs employing FuPE:PCBM as the ETL achieve reduced trap-assisted recombination, enhanced charge carrier extraction, and thus a remarkable power conversion efficiency exceeding 26% alongside improved operational stability. This work highlights an effective strategy for optimizing fullerene-based ETLs, advancing the development of highly efficient and durable PSCs.