運動的に安定したペロブスキート相CsPbI3の単結晶
Daniel B Straus1, Shu Guo1, Robert J Cava1
1Department of Chemistry , Princeton University , Princeton , New Jersey 08544 , United States.
Journal of the American Chemical Society
|July 10, 2019
まとめ
合成された動力的に安定した,室温単結晶のセシウム鉛ヨウ化物 (γ-CsPbI3) ペロブスキート. この大質量材料は独特の光学特性と酸素への安定性を表しますが,湿度で分解し,将来のペロブスキート開発を導きます.
科学分野:
- 材料科学
- 固体化学
- クリスタルグラフィー
背景:
- ペロブスキート相のセシウム鉛ヨウ化物 (γ-CsPbI3) は,光電子アプリケーションの有望な材料である.
- 大量の γ-CsPbI3の固有の性質と安定性を理解することは,デバイスの開発において極めて重要です.
- 薄膜に関する以前の研究では,量子の閉じ込め効果が示され,大体的な特徴づけが求められます.
研究 の 目的:
- γ-CsPbI3の室温単結晶を合成する.
- 大量の γ-CsPbI3 の構造,光学,安定性特性を特徴づける.
- 薄膜で観察されたものから散らばった性質を区別し,将来の研究を導く.
主な方法:
- 単一結晶の固体合成
- 構造分析のための単一結晶と粉末X線微分法 (XRD).
- 湿度と酸素の安定性を評価するために,in situガスの流れXRD.
- 光学吸収スペクトロスコーピーは,バンドギャップと電子構造を決定します.
主要な成果:
- 室温で安定したオーソロンビック γ-CsPbI3単体結晶を 合成しました
- バルク γ-CsPbI3は,帯域の縁の近くでピークに達し,1.9 eVを超えて減少するユニークな光学吸収を示す.
- 散発材料は,薄膜と異なる刺激的共鳴なしに,1.63 ((3) eVの光学バンドギャップを持っています.
- γ-CsPbI3は酸素では安定しているが,水分では迅速に δ-CsPbI3に変換される.
結論:
- 散発型 γ-CsPbI3は薄膜と比較して異なる性質を持ち,後者の量子閉じ込めを示しています.
- 合成された材料は,理論的および実験的研究のための重要なパラメータを提供します.
- 湿度感受性を理解することは,大気的に安定した無機ハリドペロブスキットを設計するための鍵です.
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