Perovskite Thin Film Solar Cells Based on Inorganic Hole Conducting Materials

Figure 7

AFM images of ITO/glass (a), CuSCN/ITO/glass (b), CH₃NH₃PbI₃ (one-step)/CuSCN/ITO/glass (c), and CH₃NH₃PbI₃(two-step)/CuSCN/ITO/glass (d). The RMS roughness values are 4.6, 19.3, 7.6, and 17.0 nm, respectively. Reprinted with permission from [46].

(a)

(b)

(c)

(d)