Fig. 5From: Enhancement of Perovskite Solar Cells Efficiency using N-Doped TiO2 Nanorod Arrays as Electron Transfer LayerPlane-view SEM images of un-doped TiO2 (a) and 1% N-TiO2 NRs (b). Cross-sectional SEM images of un-doped TiO2 (c) and 1% N-TiO2 NRs (d)Back to article page