Solution-processed perovskite films frequently exhibit a high density of defects at their surfaces and grain boundaries, leading to significant nonradiative recombination, hysteresis, and energy losses. Interfacial modification is a crucial strategy for enhancing the photovoltaic performance of perovskite solar cells. In this study, we introduce a polar molecule 3,3,3-trifluoropropionamide (TFAN) with a permanent dipole moment to modify the surface of perovskite films, effectively passivating the uncoordinated Pb