[18p-P09-1~54] 12.5 Organic and hybrid solar cells

English Presentation

[18p-P09-29] Highly Stable Solar Cells with Large Perovskite Grain and High Crystallinity via Vacuum-Deposited RbI Intercalation Technology

〇(D)Neng Hani Handayani¹, Md. Shahiduzzaman¹, Munkhtuul Gantumur¹, Yue Feng¹, Youichi Higashi², Mayu Nishimoto², Masahiro Nakano¹, Makoto Karakawa¹, Jean-Michel Nunzi¹, Tetsuya Taima¹ (1.Kanazawa Univ., 2.Iwatani Ind.)

Keywords:

RbI Intercalation,Large grain size,Stability

Perovskite solar cells (PSCs) exhibit excellent potential for achieving high-efficiency solar energy conversion. However, addressing its long-term stability remains a critical challenge, hindering the commercialization process of PSCs. MAPbI₃ (CH₃NH₃PbI₃) is the widely used perovskite for PSCs due to its excellent charge mobility, tunable bandgap, and low-temperature process. However, the sensitivity of MAPbI₃ to continuous light irradiation under the presence of oxygen causes this material to have poor stability and easily degrades into PbI₂, MA, and HI. Generally, perovskite stability is related to unstable organic A-sites such as MA⁺ (CH₃NH₃⁺). To improve the stability, more stable inorganic A-sites material such as RbI (rubidium iodide) was partially incorporated into MAPbI₃ through the solution method. However, the limited solubility of RbI in the precursor solution poses concerns in controlling the Rb composition within the perovskite film. In this study, we introduced the double-side RbI intercalation into MAPbI₃ film for the first time, combining the vacuum deposition method and the spin coating method and successfully fabricated larger perovskite grain with higher crystallinity thus increasing the efficiency of PSCs by 17.50%. Additionally, the light-soaking stability of PSCs was also significantly enhanced. After more than 200 min of continuous light irradiation, the normalized efficiency of double-side RbI intercalated-based PSCs remained over 80% of their initial efficiency while MAPbI₃-based PSCs dropped to 54%. Hence, this study revealed new possibilities for developing highly stable perovskite through the precise RbI intercalation into MAPbI₃ that may be applied to other perovskite-based electronic devices.