(3-Aminopropyl)trimethoxysilane Surface Passivation Improves Perovskite Solar Cell Performance by Reducing Surface Recombination Velocity

We demonstrate reduced surface recombination velocity (SRV) and enhanced power-conversion efficiency (PCE) in mixed-cation mixed-halide perovskite solar cells by using (3-aminopropyl)trimethoxysilane (APTMS) as a passivator. show the APTMS serves to passivate defects at surface, while also decoupling from detrimental interactions C60 interface. measure SRV of ?125 ± 14 cm/s, concomitant increase ?100 meV quasi-Fermi level splitting passivated devices compared controls. use time-resolved photoluminescence excitation-correlation spectroscopy that passivation effectively suppresses nonradiative recombination. improves both fill factor open-circuit voltage (VOC), increasing VOC 1.03 V for control 1.09 APTMS-passivated devices, leads PCE 15.90% 18.03%. attribute performance defect density resulting suppressed lower perovskite/transport layer