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2次元ラドルスデン・ポッパー鉛イオジペロブスキートにおけるカチオン工学,ケージ内の混合大A位カチオン
Yongping Fu1, Xinyi Jiang1, Xiaotong Li1
1Department of Chemistry , Northwestern University , Evanston , Illinois 60208 , United States.
Journal of the American Chemical Society
|February 8, 2020
まとめ
大量のエチラモニウムカチオンは2Dハリドペロブスキートケージに入り,ゴールドシュミット耐性因子に異議を唱える. この構造の変化はペロブスキットの特性に影響し,材料科学に新しい洞察をもたらします.
科学分野:
- 材料科学
- 固体化学
- クリスタルグラフィー
背景:
- ゴールドシュミット耐性因子は,ペロブスキート構造のカチオンサイズを伝統的に制限する.
- これらの限界を理解することは,特異な特性を持つ新しいペロブスキート材料の設計に不可欠です.
研究 の 目的:
- 大量のエチラモニウム (EA) カチオンが2Dハリドペロブスキットに標準の許容率を超えて組み込まれていることを調査する.
- これらのペロブスキットの構造的,光学的,電子的特性に対するEA カチオンの含有の影響を探求する.
主な方法:
- カチオン工学による2Dラドルズデン・ポッパー鉛ヨウ酸化ペロブスキート合成: (BA) 2 ((EAxMA1-x) 2Pb3I10.
- 構造変化を特定するための単一結晶X線微分分析.
- 光学と電子の特性を探求するためのスペクトロスコピー技術と理論的計算.
主要な成果:
- エチラモニウム (EA) カチオンは,2Dハリドペロブスキートケージに組み込まれ,構造を伸ばしました.
- EAの組み込みは,重要な Pb-I 債券の伸縮,ケージの拡張,およびオクタヘッドの歪みを増加させた.
- 観測された効果には,青にシフトしたバンドギャップ,拡大したサブバンドギャップトラップ状態,および強化された光発光の消火が含まれます.
結論:
- この研究は,2Dハリドペロブスキートにおいて,ゴールドシュミット耐性因子を構造的伸縮によって克服することができることを示している.
- この発見は,ペロブスキート材料の構造-特性関係,特に大きなカチオン組み込みに関する貴重な洞察を提供します.
- この作品は2Dペロフスキットのライブラリを拡張し,将来の材料設計の道を提供します.
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