講演情報
[10p-PA2-15]Ambient Fabrication of Cs2AgBiBr6 Double Perovskite Films: Effects of Mixed-Solvent System and Additive Engineering on Film Quality and Optical Properties
〇(D)MAHA ABUSHAWISH1, Hitoshi Mizuno1, Kimihisa Matsumoto1 (1.Toyama Prefec. Univ.)
キーワード：
Double Halide Perovskite、Cs2AgBiBr6 films、Ambient
Cs2AgBiBr6 films were deposited by spin coating under ambient conditions (relative humidity: 30–50%) using four solvent systems: pure DMSO, pure DMF, DMSO: DMF (1:1 v/v), and DMSO: GBL (1:1 v/v). Pyridine, imidazole, and carbohydrazide were used as additives. Film quality was evaluated by ultraviolet–visible absorption and photoluminescence (PL) spectroscopy. The DMSO: DMF mixture gave the most uniform films and the highest PL intensity (Fig. 1), outperforming single-solvent and DMSO: GBL conditions. Among the additives, pyridine exhibited the most well-defined band-edge absorption features. This can be attributed to the coordination of its nitrogen atom with Bi3+ ions, which suppresses the formation of trap states. These results demonstrate that the combination of DMSO: DMF solvent, nitrogen-donor additives is an effective strategy for improving the film quality and optical properties of Cs2AgBiBr6 films fabricated under ambient conditions.