オーガニック・ドナー・レセプター・インターフェースにおける電荷移転刺激の多次元的な見方

Ti Wang¹, Tika R Kafle¹, Bhupal Kattel¹

¹Department of Physics and Astronomy, University of Kansas , Lawrence, Kansas 66045, United States.

Journal of the American Chemical Society

|March 2, 2017

まとめ

電荷伝達エクシトンは異動し,有機界面に局所する. この研究は,効率的な有機太陽光発電の設計に不可欠なエクシトンダイナミクスを明らかにします.

科学分野:

材料科学
物理化学
オーガニック電子

背景:

オーガニック・ドナー・アクセプター・インターフェイスにおける電荷伝送 (CT) 離散の理解は,オーガニック・太陽光発電にとって不可欠です.
エクシトンの移位は,結合エネルギーを減少させ,解離を促進することを提案しています.

研究の目的:

エクシトン結合エネルギーの進化とフェムト秒の時間解像度の一致性を解明する.
ZnPc-C60インターフェースのCTエクシトンの空間と時間のダイナミクスを調査する.

主な方法:

実験上の課題を克服するために時間解像度光放出スペクトロスコーピーを利用した.
エネルギー,空間,時間の領域でCTプロセスを同時に捕捉します.

主要な成果:

ZnPc-C60インターフェースのCT状態の空間的なサイズと電子エネルギーの解像度.
移転したCTエキシトンの初期集団 (4nmコヒーレントサイズ) を観測した.
局所的なCT状態 (1 - 3 nm) に 2 ps 以内にリラックスされ,CTは 150 fs で発生します.

結論:

CTエクシトンのダイナミクスは,初期移位に続いてエネルギーリラックスと局所化を伴う.
効果的な電荷分離ナノ構造を設計するためのエクシトン解離メカニズムに関する重要な洞察を提供します.

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