トラップフリーCsPbX3ナノ結晶の設計原理:より柔らかいルイス基で表面ハリド空白を数え,除去する
David P Nenon1, Kimo Pressler, Jun Kang1
1Material Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States.
Journal of the American Chemical Society
|December 4, 2018
まとめ
表面ハリドの空白がセシウム鉛ハリドペロブスキート (CsPbX3) のナノ結晶に電荷が閉じ込められる主な原因であると特定しました アニオンリガンドを用いたパッシブ化戦略は 量子収量に近付いて 極めて発光する材料を生み出します
科学分野:
- 材料科学
- ナノテクノロジー
- 固体物理学
背景:
- セシウム鉛ハリドペロブスキート (CsPbX3) は光電子材料として有望である.
- 表面の欠陥,特にハライドの空白は,彼らの発光効率を大幅に妨げます.
- これらの表面のトラップを理解し緩和することは デバイスのアプリケーションにとって極めて重要です
研究 の 目的:
- CsPbX3ナノ結晶の一般的な表面受動化メカニズムを解明する.
- ナノ結晶の表面で電荷を捕まえる 主要な源を特定する
- 高度発光するCsPbX3材料を達成するための体系的なアプローチを開発する.
主な方法:
- 実験的 (光譜的方法,H NMR) と理論的 (ab initio計算) の研究を組み合わせた.
- 表面ハリドの空白の特定と定量化
- 調整不足の鉛原子を標的としたリガンドベースの受動化戦略の調査.
主要な成果:
- 表面ハライドの空白は支配的なチャージトラッピングサイトとして確認されています.
- 表面トラップと発光抑制の間の定量的な相関が確立されています.
- 特定のアニオンリガンドによる受容は,ほぼ単位の絶対量子収量と単次発光衰退をもたらす.
結論:
- CsPbX3ナノ結晶の一般的な表面受動化メカニズムが提示されています.
- 調整不足の鉛原子を標的とするアニオンリガンドは,表面トラップを効果的に受動させます.
- このフレームワークは,高度に発光するCsPbX3材料の合理的な設計を可能にします.
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