High-performance quasi-2D perovskite solar cells with power conversion efficiency over 20% fabricated in humidity-controlled ambient air

Quasi-2D perovskite solar cells (PSCs) have attracted extensive attention recently because of their superior stability to moisture, but their power conversion efficiency (PCE) still lags behind that of 3D counterparts. So, it is urgent to explore more stable and highly efficient quasi-2D PSCs. Herein, we employed fluorinated benzylammonium iodide as bulky cation to fabricate the quasi-2D PSCs. With the bulky action, quasi-2D perovskite films...