時間の解像度X線 difraktionを使用して,無鉛ペロブスキットの光誘導マイクロトレインと相変化を視覚化
Yingqi Wang1, Cunming Liu2, Yang Ren3
1Center for High Pressure Science & Technology Advanced Research, 1690 Cailun Rd, Pudong, Shanghai 201203, China.
Journal of the American Chemical Society
|March 18, 2022
まとめ
無鉛ハリドペロブスキットを時間分解のX線 difraktionで調査すると,光刺激が一時的なマイクロトレインと格子膨張を誘導することを明らかにします. これらの構造の変化は,光電子性能に影響を及ぼし,迅速に回復します.
科学分野:
- 材料科学
- 固体物理学
- 光電子機器
背景:
- メタルハリドペロブスキットは,光電子学の重要な材料です.
- 格子とキャリアの相互作用を理解することは,性能にとって極めて重要です.
- 超高速レーザースペクトロスコピーは 構造に関する間接的な洞察を提供します
研究 の 目的:
- 時間分解のX線微分法を用いて,Cs3Bi2Br9ナノ粒子の構造動態を調査する.
- 光刺激された電荷キャリアと格子歪みとの結合を調査する.
- ペロブスキットの構造に レーザーの影響を理解するために
主な方法:
- Cs3Bi2Br9ナノ粒子の時間分解X線微分法 (TRXRD)
- ピコ秒からマイクロ秒のスケールで 構造のダイナミクスを探しています
- レーザーの流動を変化させ,相変化と回復を観察する.
主要な成果:
- 軽度のレーザー流動で観測された光誘発マイクロトレイン (最大0.15%) と格子膨張 (数百ナノ秒).
- マイクロトレインの飽和度と部分的な相変化が1.4mJ/cm2以上である.
- 光学的に誘発された構造の変化は ナノ秒で回復します
結論:
- 無鉛のペロブスキートにおける電荷媒体の光刺激は,格子歪みと強く結合する.
- 暫定的な構造の変化は根本的に介電環境と電荷輸送に影響します.
- TRXRDは,光電子アプリケーションに関連する光誘導構造ダイナミクスに関する直接的な洞察を提供します.
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