Presentation Information
[15a-PA3-16]Influence of MAI loading time on perovskite crystallization via two-step process
〇(M1)Yue Ma1, Shinya Aikawa1 (1.Kogakuin Univ.)
Keywords:
Perovskite solar cells,X-ray diffraction (XRD),Crystallization
Organic inorganic halide perovskites have attracted considerable attention as materials for high efficiency solar cells, however, it remains challenging to fabricate uniform and high quality thin films under ambient conditions. The two step process offers improved controllability of crystallization, but the resting process after methylammonium iodide MAI deposition strongly affects phase conversion from PbI2 to MAPbI3 and subsequent crystal growth. In this study, MAPbI3 thin films were prepared with MAI resting times ranging from 0 to 90 seconds, and their crystal structures were evaluated by X ray diffraction. The intensity of the PbI2 001 diffraction peak reached a minimum at 30 seconds, indicating the most effective phase conversion. In contrast, excessively long resting times induced dissolution and recrystallization of PbI2, leading to degraded structural uniformity. These results demonstrate that an optimal MAI resting time exists for forming high quality perovskite films.