激子
材料科学
光致发光
带隙
富勒烯
化学物理
聚合物
共轭体系
猝灭(荧光)
接受者
基态
有机太阳能电池
激发
光化学
分子物理学
原子物理学
化学
光电子学
荧光
凝聚态物理
物理
有机化学
复合材料
量子力学
作者
Markus Hallermann,Stephan Haneder,Enrico Da Como
摘要
We report on the observation of a charge-transfer state forming at the molecular interface between a conjugated polymer and a fullerene based electron acceptor. Electron hole recombination in this state results in a luminescent transition at 840nm, energetically separated from the polymer emission. This transition can be directly photoexcited by tuning the excitation energy below the conjugated polymer bandgap, demonstrating that the charge-transfer state originates from a ground-state interaction. By electric field induced quenching of the photoluminescence, we determine a binding energy of 130meV for excitons in the charge-transfer state.
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