Fig. 3From: Phase Engineering for Highly Efficient Quasi-Two-Dimensional All-Inorganic Perovskite Light-Emitting Diodes via Adjusting the Ratio of Cs Cationb AFM topographies of corresponding perovskite films with a 3D perovskite and quasi-2D perovskite based on PPA:Cs cations of b 2:2, c 2:3, d 2:3.5, and e 2:4Back to article page