熱力学的に安定したオーソロンビック γ-CsPbI3高性能光伏の薄膜
Boya Zhao1,2, Shi-Feng Jin3, Sheng Huang4
1National Research Center for Molecular Sciences, Key Laboratory of Molecular Nanostructure and Nanotechnology , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , P. R. China.
Journal of the American Chemical Society
|August 29, 2018
まとめ
研究者は,太陽光発電のための安定した高効率のオーソロンビック γ-CsPbI3薄膜を開発しました. この突破は従来の鉛ハリドペロブスキートの不安定性を克服し,強力な太陽電池性能を実現しました.
科学分野:
- 材料科学
- 固体化学
- 太陽光発電
背景:
- 完全無機鉛ハリドペロブスキットは,有機-無機同類と比較して熱安定性を高めています.
- 望ましい立方 α-CsPbI3相は,光採集に最適ですが,室温では不安定であり,望ましくない正方形 δ-CsPbI3相に変換されます.
- α-CsPbI3の不安定さは,高効率の太陽光発電におけるその応用を妨げています.
研究 の 目的:
- 高効率の太陽光発電のための新型,熱力学的に安定した黒相薄膜のオーソロンビック γ-CsPbI3を導入する.
- 有機リガンドや混合カチオン/アニオンなしで固有の安定性を達成する.
- 頑丈な無機ペロブスキート太陽電池の開発の 新しい経路を探求する
主な方法:
- 少量のH2Oを含む単純な溶液処理による γ-CsPbI3薄膜の安定化.
- 陽子移転反応によるサイズ依存の相形成の操作.
- 理論的な計算と実験的な検証を使用して,相安定性と特性を理解する.
主要な成果:
- 固有の熱力学的安定性を有するオーソロンビック γ-CsPbI3薄膜を安定させました.
- γ-CsPbI3は,より低い表面自由エネルギーにより,特定の表面面積 (>8600 m2/mol) で δ-CsPbI3よりも熱力学的に優れていることが実証された.
- α-CsPbI3に匹敵する光電子特性と, γ-CsPbI3ベースの太陽電池で再現可能な電力変換効率11.3%を達成した.
- γ-CsPbI3の薄膜は,周囲の空気中で数ヶ月間,そして数時間の連続操作下で,堅固な安定性を観測した.
結論:
- 熱力学的に安定したγ-CsPbI3の薄膜の開発は,不安定なα-CsPbI3の実行可能な代替案を提供します.
- H2O媒介溶液プロセスは,無機鉛ヨウ酸化ペロブスキートの相不安定性を克服するための基本的な戦略を提供します.
- この研究は,完全無機ペロブスキットを基にした高性能で安定した光電子装置の道を開く.
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