We have developed two series of p-type conjugated polymers based on poly[2,3-bis-(3-octyloxyphenyl)quinoxaline-5,8-diyl-alt-thiophene-2,5-diyl] (TQ1) polymeric backbone utilizing polar pendant groups, i.e., tertiary amine and pyridine, to achieve switchable solubility in water and ethanol. By balancing the ratio between polar and non-polar side-groups, we could combine green-solvent processability with the manufacturing of functional photovoltaic devices. Due to the unavailability of water/alcohol soluble acceptors, the photovoltaic performance of these new polymers was evaluated using organic solvent by incorporating PC₆₁BM. For water/alcohol soluble partial amine-based polymers, we achieve a maximum power conversion efficiency (PCE) of ∼0.8% whereas alcohol soluble partial pyridine-based polymers show enhanced PCE of ∼1.3% with inverted device structure. We propose that the enhancement in PCE is a result of the reduction in amino-group content and the lower basicity of pyridine, both of which decrease the interaction between functionalized polymers with the anode interface material and reduce the miscibility of the donor and acceptor. Further improvement of the photovoltaic performance, in particular the open-circuit voltage (V_oc), was achieved by using an anode buffer layer to mitigate the unfavorable interaction of the amino/pyridine groups with the MoO₃ electrode. Our work demonstrated the possibility of substituent modification for conjugated polymers using tertiary amine and pyridine groups to achieve water/alcohol soluble and functional donor materials.

我们已经利用聚[2,3-双-（3-辛氧基氧基苯基）喹喔啉-5,8-二基-alt-噻吩-2,5-二基]（TQ1）聚合物骨架开发了两个系列的p型共轭聚合物极性侧基，即叔胺和吡啶，以实现在水和乙醇中的可转换溶解度。通过平衡极性和非极性侧基之间的比例，我们可以将绿色溶剂的可加工性与功能性光伏器件的制造相结合。由于没有水/醇溶性受体，因此通过掺入PC ₆₁使用有机溶剂评估了这些新聚合物的光伏性能。BM。对于水/醇溶性部分胺基聚合物，我们实现了约0.8％的最大功率转换效率（PCE），而醇溶性部分吡啶基聚合物显示出具有反向器件结构的增强的PCE约1.3％。我们认为PCE的增强是氨基含量降低和吡啶碱度降低的结果，这两者都会降低官能化聚合物与阳极界面材料之间的相互作用，并降低供体和受体的混溶性。光伏性能的进一步改善，特别是开路电压（V通过使用阳极缓冲层来减轻氨基/吡啶基与MoO ₃电极的不利相互作用来实现_oc）。我们的工作证明了使用叔胺和吡啶基团修饰共轭聚合物的取代基的可能性，从而获得水/醇溶性和功能性供体材料。