ZnPc/MoS2インターフェースにおける光誘導電荷生成に対するインターフェイスエネルギーランドスケープの影響
Tika R Kafle1, Bhupal Kattel1, Peng Yao1,2
1Department of Physics and Astronomy , University of Kansas , Lawrence , Kansas 66045 , United States.
Journal of the American Chemical Society
|July 2, 2019
まとめ
オーガニック/MoS2インターフェースの電荷伝達エクシトンは異なる振る舞いをする. 帯域の配列ではなく 潜在エネルギー環境が 荷電を自由キャリアに分割することを 決定します
科学分野:
- 材料科学
- 物理化学
- 表面科学
背景:
- 単層の移行金属二カルコゲン化物 (TMDC) の結晶は,有機分子で異質構造を形成する.
- 超高速電荷伝送 (CT) は有機/TMDCインターフェイスで発生するが,エクシトンの自由キャリアへの分離は完全に理解されていない.
研究 の 目的:
- 亜鉛フタロシアニン (ZnPc) /MoS2インターフェイスでの電荷伝送とエクシトンダイナミクスを調査する.
- リコンビネーションと電荷分離を好む条件を理解する.
主な方法:
- 時間解像度と安定状態の光放出スペクトロスコーピー
- ZnPc/単層MoS2とZnPc/バルクMoS2のインターフェースを研究した.
主要な成果:
- 両方のインターフェイスはタイプII帯域配列と超高速の電荷伝送 (<100fs) を示す.
- ZnPc/単層 MoS2は,エクシトンの解離を自由キャリアに促進する.
- ZnPc / bulk MoS2は,帯屈曲の違いのためにZnPcでトリプルエクシトンを形成する,逆転電子伝送を示す.
結論:
- 潜在エネルギー環境は,インターフェイスの電荷分離に大きく影響します.
- オーガニック/TMDC インターフェイスでの無料充電生成を予測するには,エネルギーレベル調整だけでは不十分です.
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