KF-Doped SnO₂ as an electron transport layer for efficient inorganic CsPbI₂Br perovskite solar cells with enhanced open-circuit voltages

KF was first introduced into the SnO₂ ETL for all-inorganic CsPbI₂Br PVSCs with enhanced performance by regulating the work function and passivating defects of the perovskite.