Additive effect of bromides and chlorides on the performance of perovskite solar cells fabricated via sequential deposition

Construction of Efficient and Stable FAPbI3 Perovskite Solar Cells through Bifunctional Ionic Liquid‐Assisted Crystallization and Defect Passivation

“…1) The functional groups on imidazole cation can interact with the perovskite component, inhibiting the rapid crystallization process of perovskite, easily promoting the expansion of the lattice, reducing GBs, and improving the film quality. [29,39,43] Cl À is employed to assist grain growth along with preferred orientation of perovskite grains [44][45][46][47][48][49] ; 2) AOMCl still exists in the film after annealing, which can passivate grain boundaries and surface defects and stabilize the α-FAPbI 3 phase. Both imidazole and amide groups contained in AOMCl cations can strongly interact with perovskites; and 3) AOMCl has hydrophobicity groups, which can resist moisture and improve the stability of the PSCs.…”