An imidazolium‐based 1‐B‐3‐MIMPF6 ionic liquid containing benzene ring with its large size, π‐π conjugation bond, and asymmetric charge distribution effect was utilized as the interface modifier for CsPbI2Br PSCs. The imidazole ring, benzene ring, and fluorine atoms of 1‐B‐3‐MIMPF6 have played a pivotal role in the synergistic effect of defect passivation, carrier transfer enhancement, large steric hindrance, and hydrophobicity. Abstract In recent years, hole transport layer‐free all‐inorganic CsPbI2Br carbon‐electroded perovskite ...
