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采用物理喷束淀积技术,制备了聚乙烯咔唑(PVK)与富勒烯C60的组合薄膜系列,通过测量这些组合膜和纯膜的稳态和瞬态光生电压,研究了组合膜光诱导电荷转移性质.发现PVK/C60双层组合膜的光生电压比纯PVK薄膜和PVK与C60均匀混合膜有5个数量级的增强,比纯C60薄膜也有大于一个数量级的增强.实验结果证明:在光激发下,组合膜中两种分子间发生了快速的电子转移,并在PVK/C60界面处产生有效的电荷分离,导致PVK/C60双层组合膜光生电压的显著增强.并通过与ITO/C60/Al结构的瞬态光生电压响应的比较,表明了高聚物与C60之间发生了更快的分子间的电荷转移过程
The combination of polyvinylcarbazole (PVK) and fullerene C60 thin films was prepared by physical spray deposition technique. The steady-state and transient photo-induced voltages of these composite films and pure films were measured. It is found that the photogenerated voltage of PVK / C60 double-layer composite film is five orders of magnitude stronger than that of pure PVK film and PVK and C60 uniform mixed film, and more than an order of magnitude more than that of pure C60 film.The experimental results show that in the light Under the excitation, the rapid electron transfer between the two molecules in the composite membrane and the effective charge separation at the PVK / C60 interface resulted in a significant increase of the photovoltaic voltage of the PVK / C60 double-layer composite membrane. / Al structure of the transient photogenerated voltage response comparison shows that the polymer and C60 faster intermolecular charge transfer occurred between the process