調節可能なオープン回路の電圧の起源は,三次混合の大量ヘテロ結合有機太陽電池の三次混合である
Robert A Street1, Daniel Davies, Petr P Khlyabich
1Palo Alto Research Center, Palo Alto, California 94304, USA. street@parc.com
Journal of the American Chemical Society
|January 5, 2013
まとめ
有機太陽電池は,電荷輸送における合金のような振る舞いによりユニークな電子特性を発揮しますが,光の吸収のための個々の分子特性を保持しています. この組み合わせは,次世代の有機光伏の効率を高めます.
科学分野:
- 材料科学 材料科学とは
- オーガニック・エレクトロニクス
- フォトボルトイカは,太陽光発電です.
背景:
- テルナリーブレンドの大量ヘテロジャンクション有機太陽電池は,光伏の性能を向上させる可能性を秘めています.
- 分子組成と電子特性の相互作用を理解することは,これらのデバイスの最適化に不可欠です.
研究 の 目的:
- 三重混合有機太陽電池のユニークな電子および光学特性を調査する.
- 混合物の組成と電荷運搬体およびエキソン体の行動の関係を解明する.
主な方法:
- 異なるドナー/受容器比率を持つ三元混合有機太陽電池の製造.
- 光電流のスペクトル応答とオープン回路の電圧の測定.
- 最も高い占有分子軌道 (HOMO) と最も低い不占有分子軌道 (LUMO) レベルの分析.
主要な成果:
- HOMOとLUMOのレベルは,混合物の組成によって継続的に変化し,有機合金形成を示します.
- 光学吸収スペクトルは,個々の分子構成要素の特性を保持しています.
- エクシトンの局所化は,電荷キャリアの異地化とは異なり,分子対分子間相互作用の影響を受けます.
結論:
- テルナリーブレンドは,合金形成を通じて電子特性 (例えば,オープン回路電圧) の継続的なチューニングを可能にします.
- 個々の分子刺激の保存により,広範囲の光子エネルギーの収穫が可能になります.
- この二重な振る舞いは,高効率の有機太陽電池のための有望なプラットフォームとして,三元混合物を確立します.
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