Fig. 2From: Enhanced Performance of Planar Perovskite Solar Cells Using Low-Temperature Solution-Processed Al-Doped SnO2 as Electron Transport Layers a UV-vis absorbance spectra and b XRD patterns of perovskite films grown on SnO2 and Al-SnO2 substrates. c EQE curves and integrated current density of perovskite solar cells based on SnO2/Al-SnO2 and d J-V curves of the best-performing PSC using SnO2/Al-SnO2 ETLsBack to article page