固体NMRからCs-,Rb-およびK-ドープされた混合カチオン (MA) x (FA) 1-xPbI3の相分離
Dominik J Kubicki, Daniel Prochowicz1, Albert Hofstetter
1Institute of Physical Chemistry, Polish Academy of Sciences , Kasprzaka 44/52, 01-224 Warsaw, Poland.
Journal of the American Chemical Society
|September 12, 2017
まとめ
この研究では,固体NMRを用いてフォームミジニウムベースのペロブスキートにセシウムとルビジウムを組み込むことを調査した. 太阳能電池の高い効率と安定性の背後にある要因を明らかにします.
科学分野:
- 材料科学
- 固体化学
- 太陽光発電
背景:
- 次世代の太陽電池に期待できる 混合有機-無機ペロブスキットです
- マルチカタン鉛ハリドペロブスキットは高電力変換効率 (最大22%) を達成する.
- セシウム (Cs) やルビジウム (Rb) のような元素の原子レベルでの組み込みを理解することは,パフォーマンスを最適化するために極めて重要です.
研究 の 目的:
- CsとRbがフォームミディニウム (FA) 基のペロブスキート格子に原子レベルで組み込まれていることを明らかにする.
- 鉛ハリドペロブスキットの様々なカチオンを含む相の顕微鏡組成を調べる.
- 薄膜の機械化学ペロブスキットの構造を比較する.
主な方法:
- 固体磁気共振 (MAS) スペクトロスコーピー
- 探査のために133Cs,87Rb,39K,13C,および14Nの原子核を使用した.
- ダブル,トリプル,クアドルプルカテンの鉛ハライドを散らばった形や薄膜で分析した.
主要な成果:
- 過去の報告に反して,RbやKが3Dペロブスキート格子に組み込まれた証拠は見つかりませんでした.
- Cs,Rb,K,MA,FAを含む相の顕微鏡組成を決定した.
- 大量メカノケミカルなペロブスキート構造は薄膜構造に似ています.
結論:
- この研究は,これらの多重化ペロブスキートシステムの光伏パラメータと安定性の基本的な理解を提供します.
- 高性能ペロブスキート太陽電池における特定のカチオン組み込み (またはその欠如) の役割を明確にします.
- ペロブスキート材料の詳細な構造と組成の分析のための固体NMRの有用性を強調します.
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