Research Article
Effect of Perovskite Film Preparation on Performance of Solar Cells
Figure 7
Top-view SEM images of the PbI2 layer deposited on the mp-TiO2 coated FTO substrate, where the drying time is for (a) 0 min, (b) 5 min, (c) 10 min, (d) 20 min, and (e) 30 min. The MAPbI3 thin film layers correspond to the PbI2 films (f–j), which were dried at room temperature for different time.