ペロブスキットの安定性に対するハリド混合の影響を解明する
Jeremy Hieulle1, Xiaoming Wang2, Collin Stecker1
1Energy Materials and Surface Sciences Unit (EMSSU) , Okinawa Institute of Science and Technology Graduate University (OIST) , 1919-1 Tancha , Onna-son , Okinawa 904-0495 , Japan.
Journal of the American Chemical Society
|January 17, 2019
まとめ
ハリド混合は太陽電池のペロブスキート安定性を高めます 特に塩素の組み込みは,商用太陽光発電のアプリケーションに不可欠なアニオン分布に影響を与えることで,優れた安定性を提供します.
科学分野:
- 材料科学
- 固体化学
- 太陽光発電
背景:
- ペロブスキート製の太陽電池は 商業的に利用可能になるためには 安定性を高める必要があります
- ハリド混合はペロブスキート材料の安定性を向上させるための重要な戦略です.
- 混合ペロブスキートにおけるハリドイオンの正確な分布は議論の余地があるが,性能には極めて重要である.
研究 の 目的:
- 混合ハリドペロブスキート格子におけるアニオン (ヨウ素と塩素) の正確な位置を決定する.
- ハライドの分布と物質の安定性を相関させる.
- バンドギャップを損なうことなく,安定性のために最適の塩素の組み込みを特定する.
主な方法:
- 結合したスキャニングトンネル顕微鏡 (STM) と密度関数理論 (DFT) を用いてアニオン局所化を行う.
- ハリドペロブスキットの電子特性と安定性の分析
- 安定性を検証するために半細胞装置の光電子スペクトロスコーピー.
主要な成果:
- CH3NH3PbBr3-yIyとCH3NH3PbBr3-zClzのペロブスキートにおけるヨウ素と塩素アニオンの位置を正確に決定した.
- 塩素の組み込みはヨウ素と比較してペロブスキットの安定性を大幅に高めることが示された.
- バンドギャップの不良な変化なしに安定性を向上させる最適の塩素比率を特定した.
結論:
- ハリドアニオンの分布とペロブスキットの安定性への影響に関する議論を解決した.
- 塩素を組み込むことは,安定したペロブスキート光伏装置を製造するための有望な戦略です.
- この発見は 次世代の耐久性のあるペロブスキート太陽電池の設計に 重要な洞察を与えてくれます
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