Two-step processed efficient perovskite solar cells via improving perovskite/PTAA interface using solvent engineering in PbI2 precursor
Long Cao-Yu, Wang Ning, Huang Ke-Qing, Li Heng-Yue, Liu Biao, Yang Jun-Liang ‡
       

SEM images of (a) DMSO-0%, (b) DMSO-5%, (c) DMSO-10%, and (d) DMSO-20% PbI2 film, respectively. SEM images of perovskite films derived from (e) DMSO-0%, (f) DMSO-5%, (g) DMSO-10%, and (h) DMSO-20% PbI2 precursor, respectively. Cross-section SEM images of perovskite films derived from (i) DMSO-0%, (j) DMSO-5%, (k) DMSO-10%, and (l) DMSO-20% PbI2 precursor, respectively.