CsPb2Br5-assisted direct crystallization of the 3D perovskite phase for highly efficient and stable solar cells

The α-FAPbI 3 was achieved through a direct growth strategy of CsPb 2 Br 5 seed induction at room temperature. This strategy has delivered a superior PCE of 25.55%, the PSCs exhibit excellent stability, and the module efficiency was increased to 22.35%.