Fig. 1From: Enhanced Performance of Planar Perovskite Solar Cells Using Low-Temperature Solution-Processed Al-Doped SnO2 as Electron Transport Layers a Top view SEM images of low-temperature solution-processed SnO2 on FTO and b bare FTO. c Cross-sectional SEM image of the planar perovskite solar cell based on Al-SnO2, d schematic of the PSCs grown on Al-SnO2, and e energy band diagram of the PSCsBack to article page