Phosphonium‐based polythiophene conjugated polyelectrolytes (CPEs) with three different counterions (dodecylsulfate, octylsulfate and perfluorooctane sulfonate) are synthesized to determine how the nature of the counterion affects the thermal properties, the self‐assembly in thin films and the performance as the cathode interfacial layer in polymer solar cells (PSCs). The counterion has a significant effect on the thermal properties of the CPEs, affecting both their glass transition and crystalline behaviour. Grazing‐incidence wide‐angle X‐ray scattering studies also indicate that changing the nature of the counterion influences the microstructural organization in thin films (face‐on versus edge‐on orientation). The affinity of the CPEs with the underlying photoactive layer in PSCs is highly correlated with the counterion species. Finally, in addition to an increase of the power conversion efficiency of ca 15% when using these CPEs as cathode interfacial layers in PSCs, a higher device stability is noted, compared to a reference device with a calcium interlayer. © 2020 Society of Industrial Chemistry

中文翻译：

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具有不同表面活性剂抗衡离子的based基聚噻吩共轭聚电解质：热性能，自组装和光伏性能

合成具有三种不同抗衡离子（十二烷基硫酸盐，辛基硫酸盐和全氟辛烷磺酸盐）的磷基聚噻吩共轭聚电解质（CPE），以确定抗衡离子的性质如何影响热性能，薄膜的自组装以及作为阴极界面的性能聚合物太阳能电池（PSC）中的层。抗衡离子对CPE的热性能有重要影响，同时影响CPE的玻璃化转变和结晶行为。掠入射广角X射线散射研究还表明，改变抗衡离子的性质会影响薄膜的微观结构（面对面与表面边缘定向）。CPE与PSC中下层光敏层的亲和力与抗衡离子种类高度相关。最后，与使用钙中间层的参考器件相比，使用这些CPE作为PSC中的阴极界面层时，除了功率转换效率提高了约15％外，还注意到了更高的器件稳定性。©2020工业化学学会