Antisolvent effects in green solvent engineering of FA-based quasi-2D Ruddlesden–Popper perovskite films for efficient solar cells

We investigate the proper green solvents for fabricating the high performance formamidinium (FA)-based quasi-2D perovskites solar cells. We find the petroleum ether is a more suitable antisolvent for quasi-2D perovskite crystallization than the traditional used antisolvent dibutyl ether.