Two-step processed efficient perovskite solar cells via improving perovskite/PTAA interface using solvent engineering in PbI<sub>2</sub> precursor

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^‡

(a) XRD patterns of perovskite films derived from DMSO-0%, DMSO-5%, DMSO-10%, and DMSO-20% respectively, (b) photographs of perovskite films stored in ambient environment for 1 week, and (c) absorbance spectra of perovskite films derived from DMSO-0%, DMSO-5%, DMSO-10%, and DMSO-20% respectively.