Fig. 5From: UV Treatment of Low-Temperature Processed SnO2 Electron Transport Layers for Planar Perovskite Solar CellsCross-sectional SEM images of a the ITO/SnO2 (10%), b ITO/SnO2 (15%), c ITO/SnO2 (20%), and d ITO/SnO2 (30%)Back to article page