Fig. 5From: Perovskite Solar Cells Based on Compact, Smooth FA0.1MA0.9PbI3 Film with Efficiency Exceeding 22%Topography images (a, d), 3D topography images (b, e), and surface potential images (c, f) of MAPbI3 film and FA0.1MA0.9PbI3 filmBack to article page