Fig. 2From: Gradient Engineered Light Absorption Layer for Enhanced Carrier Separation Efficiency in Perovskite Solar CellsThe surface and cross-sectional morphologies of perovskite films: a MAPbI3, b MAPbIxBr3 − x, and c G-MAPbIxBr3 − x. The inserts are their cross-sectional imagesBack to article page