金属ハリドペロブスキートの原子スケールの微細構造
Mathias Uller Rothmann1, Judy S Kim2,3,4, Juliane Borchert1
1Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, UK.
Science (New York, N.Y.)
|October 30, 2020
まとめ
ハイブリッドペロブスキートの原子解像度画像は,その秩序ある構造と分解メカニズムを明らかにします. これらの特性を理解することは,ホルマミドニウム鉛トライオイドを用いた太陽エネルギー技術の進歩の鍵です.
科学分野:
- 材料科学
- 再生可能エネルギー
- 固体物理学
背景:
- ハイブリッドの有機-無機ペロブスキットは太陽電池にとって有望であるが,詳細な顕微鏡の理解は欠けている.
- 原子解像度の画像は,結晶型の太陽材料の性質を明らかにするために不可欠です.
研究 の 目的:
- 低用量電子顕微鏡を用いて,アトミックレベルでアミジニウム鉛トリヨイド薄膜をイメージする.
- これらのペロブスキットの微小な性質,粒子の境界,インターフェース,欠陥構造を理解する.
- ビームによる分解を調査することによって,ペロブスキートの再生特性について説明する.
主な方法:
- 原子解像度のスキャニング伝送電子顕微鏡 (STEM) で,低電子線量照射を行う.
- フォーマミジニウム鉛トリヨイド [CH ((NH2) 2PbI3) ]の薄膜のイメージング
- ビームによる劣化と欠陥構造の分析
主要な成果:
- 鋭い粒子の境界と一貫したペロブスキート/PbI2のインターフェースを持つ高度に秩序付けられた原子配列を明らかにした.
- 結晶構造の長距離障害の欠如が観察された.
- 電子ビームの照射により フォルマミドニウムイオンが失われ 格子に空白が生じ 再生性があることがわかりました 配列点の欠陥と変位も観察した.
結論:
- 鉛ハリドペロブスキットの構造と分解に関する原子レベルの洞察を提供した.
- この発見は,ペロブスキート太陽材料の顕微鏡構造,分解,再生特性との関係を明らかにしています.
- この理解は 効率的で安定したペロブスキート太陽電池の開発に不可欠です
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