安定した傾斜八面型ハリドペロブスキットは,性能制限相の局所的形成を阻害する
Tiarnan A S Doherty1, Satyawan Nagane1, Dominik J Kubicki1,2
1Department of Physics, Cavendish Laboratory, University of Cambridge, Cambridge, UK.
Science (New York, N.Y.)
|December 23, 2021
まとめ
フォトウォルタイクのためのフォームミジニウム (FA) ペロブスキットの安定化には,オクターヘッドの傾きを理解する必要があります. この傾きをFAペロブスキートフィルムで設計することで,分解に対する安定性が向上し,太陽電池の性能が向上します.
科学分野:
- 材料科学
- 固体化学
- 太陽光発電
背景:
- フォルマミジニウム (FA) ベースのハリドペロブスキットは,高効率の太陽光発電に不可欠です.
- これらのペロブスキットの光活性立方相 (α-FAPbI3) を安定化することは大きな課題です.
- 現在の安定化方法は,経験的なカチオン合金 (例えばセシウム,メチラムニウム) を含む.
研究 の 目的:
- 経験的に安定したFA豊富なペロブスキットの構造的性質を調査する.
- ペロブスキットの相安定性におけるオクターヘッドの傾きの役割を理解する.
- カチオン合金なしでα-FAPbI3を安定させるための代替方法を開発する.
主な方法:
- 局所的な八面形の傾きを解決するナノ構造の特徴化技術.
- 合金ペロブスキート膜におけるカチオン分布の分析
- 純粋なα-FAPbI3フィルムにエチレンジアミネトラエセチック酸 (EDTA) を用いて八面性傾斜を誘導する表面工学.
主要な成果:
- 経験的に安定したFA豊富なペロブスキットは,約2°の八面形の傾きを持つ非立方体の構造を示しています.
- 八面形の傾きは不安定な六角形への移行を阻害し,マクロスコープの安定性を高める.
- 異質なカチオンの分布は局所的な不安定性と性能の損失をもたらします.
- EDTAでテンプレートされた純粋なα-FAPbI3フィルムは,熱的,環境的,および光によるストレスに対する有意な安定性を示した.
結論:
- 八面形の傾きは,FAベースのペロブスキットの光活性相を安定させるための鍵です.
- 表面工学は,性能を損なうことなく安定したα-FAPbI3膜を達成するための有望な経路を提供します.
- このアプローチにより より耐久的で効率的なペロブスキート太陽電池が作れるでしょう
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