Preferred Parallel Alignment of Sulfonamide Enables High‐performance Inverted Perovskite Solar Cells

defects. Moreover, incorporating CO-BSA promotes the formation of perovskite films with large grain sizes, high quality, and low defect densities. Consequently, the device modified with CO-BSA achieves an efficiency of 26.53% (certified 26.31%). The encapsulated CO-BSA-based cell retains 96.1% of its initial efficiency after 1100 h of steady-state power output (SPO) measurement in air.