2022 Fiscal Year Final Research Report
Aqueous phase synthesis of highly crystalline lead-free perovskites by designing complex species and controlling reaction fields
Project/Area Number |
21K20475
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Research Category |
Grant-in-Aid for Research Activity Start-up
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Allocation Type | Multi-year Fund |
Review Section |
0401:Materials engineering, chemical engineering, and related fields
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Research Institution | Tohoku University |
Principal Investigator |
Yokoyama Koji 東北大学, 環境科学研究科, 助教 (00911158)
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Project Period (FY) |
2021-08-30 – 2023-03-31
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Keywords | 鉛フリーペロブスカイト / ペロブスカイト太陽電池 / 水中合成 |
Outline of Final Research Achievements |
The degradation of the hydroiodic acid solubilizer for tin iodides and the oxidative degradation of tin species in precursor solutions/perovskite materials have been obstacles to the ambient aqueous-phase synthesis of tin iodide perovskites. In this study, alkali iodides, which are more stable than hydroiodic acid, were used as a solubilizer to prepare high-concentration (0.5 mol/L) and stable precursor aqueous solutions in ambient air. Furthermore, the addition of ascorbic acid as a reducing agent in the aqueous solutions inhibited the oxidation of tin species. The perovskite samples obtained from these aqueous solutions exhibited less degradation after exposure to air than previously reported samples. In conclusion, the ambient aqueous-phase synthesis of high-quality perovskite materials was achieved through the optimization and stabilization of precursor aqueous solutions.
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Free Research Field |
無機材料化学
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Academic Significance and Societal Importance of the Research Achievements |
本研究では、低環境負荷で安全な合成系を用いて、既存の材料をも凌ぐ高品質・高耐久なヨウ化スズ系ペロブスカイト材料を合成する新規プロセスを確立した。本合成法をベースとすれば、原料水溶液の塗布によるハライドペロブスカイト光電変換層の大気中成膜が実現でき、酸素・水分に弱いとされてきたハライドペロブスカイト材料の化学の転換点となり得るとともに、ハライドペロブスカイト材料と酸素・水分との相互作用に関する基礎研究の進展にも寄与し得る。さらに、本合成法は、禁水設備などの特殊な製造設備を必要としないペロブスカイト太陽電池製造法に展開可能であるため、次世代型太陽電池の実用化・社会実装を加速するものと期待される。
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