[20p-P02-1~19] 12.5 Organic solar cells

▲ [20p-P02-16] Highly Stable Perovskite Solar Cells utilizing Intercalation Control of Cesium Halides into MAPbI₃ Framework

〇Yue Feng¹, M. Shahinuzzaman¹, G. Munkhtuul¹, M. Nakano¹, M. Karakawa¹, J.M. Nunzi¹, T. Taima¹ (1.Kanazawa Univ.)

Keywords:Stability

Perovskite solar cells (PSCs) have drawn considerable interest of the researchers and achieved the power conversion efficiency (PCE) of 25.7% in laboratory scale. However, the insufficient stability is still the most challenging issue for PSCs that needs to be solved. Up to date, introduction of a small amount of cesium halides (CsX) particularly CsCl, CsBr and CsI into perovskite precursor solution has shown improved device performance. However, due to the limited solubility of these materials, this method leads to the imperfect surface coverage because of pinhole formation during spin coating, as well as has difficulties to control the Cs+ concentration and film thickness. Previously, our laboratory has successfully intercalated CsI into perovskite MAPbI₃ framework and achieved a PCE of 18.43% and remained above 80% of their initial output after 6000 h storage in open air (non-encapsulated) [1]. Precise intercalation technology of CsX has not yet studied widely. In this study, we introduced thin layers of vacuum-deposited CsX (CsCl, CsBr, and CsI) from the down layer into the solution processed host perovskite MAPbI₃ films to facilitate intercalation, resulted in high-quality perovskite film for high stable PSCs.