用石墨烯/CuInS2量子点复合物(rGO/CuInS2-QDs)和聚2-甲氧基-5-(2-乙基己氧基)-1,4-对苯乙炔(MEH-PPV)制备了MEH-PPV/rGO-CuInS2杂化聚合物太阳电池。 用动态测试方法研究了电池的电荷传输动力学特点。实验结果表明,与MEH-PPV/rGO器件相比,MEH-PPV/rGO-CuInS2器件的电子传输时间和电子寿命均有显著的增加, 这分别源于CuInS2量子点的表面缺陷态捕获及CuInS2量子点作为阻挡层促进了电子-空穴对的有效分离。证实了MEH-PPV/rGO-CuInS2电池中短路电流的增加 主要与聚合物中激子分离的增加和载流子复合的减少有关；器件的开路电压主要是由石墨烯的功函数和MEH-PPV的最高已占分子轨道(HOMO)之间的能级差决定, 同时受石墨烯中电子浓度的影响。

MEH-PPV/rGO-CuInS2 hybrid polymer solar cells are fabricated with the graphene/CuInS2 quantum dots hybrid (rGO/CuInS2-QDS) and poly 2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene vinylene (MEH-PPV), and the dynamic characteristics of charge transport are investigated by using dynamic test method. Experimental results show that compared with MEH-PPV/rGO devices, the electron transit time and electron lifetime of MEH-PPV/rGO-CuInS2 devices are significantly increased, which are attributed to the surface defect states trapping on CuInS2 quantum dots and the effective separation of electron-hole pair promoted by CuInS2 quantum dots as a barrier layer, respectively. It is confirmed that the increasing of short circuit current in MEH-PPV/rGO-CuInS2 devices is mainly related to the increasing of exciton dissociation in polymer and decreasing of carrier recombination. The open-circuit voltage of device is mainly determined by the energy difference between the highest occupied molecular orbital (HOMO) level of MEH-PPV and work-function of graphene, and it’s influenced by the electron concentration in graphene.