[9a-PB5-1~11] 12.8 Specific theme: Photoelectric Properties, Structural Controls and Device of Perovskites Materials

English Presentation

[9a-PB5-7] Effects of Halide Anions in Imidazolium-based Ionic Liquid-Aided Perovskite Films for Enhanced Stability of Solar Cells

〇Zhanlong Chen¹, Souma Sakakibara¹, Yuugo Nakahara¹, Masahiro Nakano¹, Makoto karakawa¹, J. M. Nunzi¹, Md. Shahiduzzaman¹, Tetsuya Taima¹ (1.Kanazawa Univ.)

Keywords:

perovskite solar cells,ionic liquids,moisture stability

In this study, imidazolium-based ionic liquids (ILs) with different halide anions, HMIMCl, HMIMBr, and HMIMI, were introduced into CsFAMA perovskite precursor solutions to investigate the role of halide anions of ILs in perovskite solar cells. The IL additives were expected to improve film quality, passivate defects, and enhance device stability.The IL-treated devices exhibited improved moisture stability compared with the pristine device. Among the three ILs, HMIMCl showed the best stability improvement. This tendency is likely related to the smaller ionic radius of Cl⁻, which may allow more effective passivation of halide vacancies and defect sites in the perovskite films. These results indicate that the halide anion in IL additives plays an important role in determining the stability of CsFAMA-based PSCs.