O3 fast and simple treatment-enhanced p-doped in Spiro-MeOTAD for CH3NH3I vapor-assisted processed CH3NH3PbI3 perovskite solar cells |
(color online) Absorption spectrum of CH3NH3PbI3 film and top-view SEM images for the sample of FTO/TiO2/CH3NH3PbI3. (Insert image with higher resolution, scale bar: 100 nm). |