| 초록 |
Researchers on perovskite crystallization have an attention to improve the film coverage of the perovskite layer. In this study, the film uniformity was controlled by applying octanedithiol (ODT) in chlorobenzene (CB; for anti-solvent treatment). Through the morphology analysis (AFM and FE-SEM) of the perovskite layer, smooth topography and grain size changes were observed according to the volume ratio of ODT, compared with the reference sample. This is due to competition for nucleation and grain growth (LaMer model effect) depending on volume ratio of the additive. Based on this, improved property of charge separation was confirmed under optimal conditions in optical analysis (PL and TRPL). When applied to perovskite devices, enhanced performance was confirmed at the critical point (ODT 1v%). In conclusion, this study suggests the effect of organic additive on perovskite crystallization via ionic bonding between -SH thiol functional group of ODT and the metal of perovskite. |
