39Kの固体NMRから21.1Tのカリウムドープされた鉛ハリドペロブスキットの相分離
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
|May 22, 2018
まとめ
鉛ハリドペロフスキットのカリウムドーピングは,ペロフスキット格子にカリウムを組み込まない. 材料の組成と太陽電池の性能に 影響を及ぼします
科学分野:
- 材料科学
- 固体化学
- 太陽光発電
背景:
- オーガニック・インオーガニック・リード・ハリド・ペロブスキットは,次の世代の太陽電池のための非常に効率的な光吸収剤であり,22%以上の効率を達成します.
- 効率がサイクル履歴に依存する電流-電圧 (J-V) ヒステリーシスは,ペロブスキート太陽電池にとって重要な課題です.
- カリウムドーピングはJ-Vヒステリースを緩和する有望な戦略ですが,その原子化メカニズムは不明です.
研究 の 目的:
- KIドーピングされたマルチケーションとマルチアニオン鉛ハリドペロブスキートのカリウム含有相の最初の原子レベルでの特徴づけを提供すること.
- 原子スケールでのJ-Vヒステリシスの抑制におけるカリウムの役割を明らかにする.
主な方法:
- 固体核磁共振 (NMR) スペクトロスコーピー,特に21.1Tの39K MAS NMR.
- カリウムドーピングされた鉛ハリドペロブスキートサンプルの特徴
主要な成果:
- 3Dペロブスキート格子にカリウムが組み込まれている証拠は見つかりませんでした.
- KIドーピングは,カリウム豊富なフェーズと反応しないKIの形成をもたらしました.
- Brを含有するペロブスキートでは,KIドーピングによってKI/KBr混合物が生成され,Br/I比が変化した.
- 同時にCsとKをドーピングすると,ペロブスキート以外のCs/K鉛ヨウ酸化相が生じる.
結論:
- カリウムドーピングは,K+イオンをペロブスキート構造に統合しません.
- KIドーピングの効果は,グリッドの組み込みではなく,観察されたカリウムに富んだ相による.
- これらの二次相構造を理解することは,ペロブスキート太陽電池の安定性と性能を最適化するために不可欠です.
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