In our previous work, the device performance of polymer solar cells (PSCs) was enhanced by blending surfactant-treated graphene oxide (GO) nanocomposites [didodecyldimethyla-mmonium bromide (DDAB):GO] as the active layer. However, its underlain mechanism is not clearly reported. In this work, therefore we measured the charge carriers mobility of the active layers before and after blending GO:DDAB nanocomposites to reveal the role of GO:DDAB in PSCs, and found that GO:DDAB can form three-dimensional network for charge carriers transport, meanwhile ‘traps’ for electrons can be introduced by GO:DDAB and formed in the bulk and/or at active-layer/electrode interfaces, compromising the electron mobility. Meanwhile, the hole mobility was improved due to the enhanced crystallinity of the composite films after blending GO:DDAB into P3HT:PCBM. Therefore, the transport balance between electrons and holes is enhanced and thus the device performance is improved.

在我们以前的工作中，通过将表面活性剂处理的氧化石墨烯（GO）纳米复合材料[十二烷基二甲基甲溴化铵（DDAB）：GO]掺混为活性层，可以提高聚合物太阳能电池（PSC）的器件性能。但是，其底层机制尚未明确报道。因此，在这项工作中，我们测量了混合GO：DDAB纳米复合材料之前和之后活性层的电荷载流子迁移率，以揭示GO：DDAB在PSC中的作用，并发现GO：DDAB可以形成三维网络进行电荷载流子传输，与此同时，GO：DDAB可以引入电子的“陷阱”，并在主体和/或活性层/电极界面处形成，从而损害了电子迁移率。同时，由于将GO：DDAB掺入P3HT：PCBM中后复合膜的结晶度提高，从而提高了空穴迁移率。所以，