A Nonconjugated Zwitterionic Polymer: Cathode Interfacial Layer Comparable with PFN for Narrow‐Bandgap Polymer Solar Cells,Macromolecular Rapid Communications

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A Nonconjugated Zwitterionic Polymer: Cathode Interfacial Layer Comparable with PFN for Narrow‐Bandgap Polymer Solar Cells
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2018-03-08 , DOI: 10.1002/marc.201700828
Zhendong Li ₁ , Qiaoyun Chen ₁ , Yanfeng Liu ₁ , Lan Ding ₁ , Kaicheng Zhang ₁ , Kai Zhu ₁ , Ligang Yuan ₁ , Bin Dong ₁ , Yi Zhou ₁ , Bo Song ₁

Affiliation

A nonconjugated, alcohol‐soluble zwitterionic polymer, poly(sulfobetaine methacrylate) (denoted by PSBMA), is employed as cathode interfacial layer (CIL) in polymer solar cells (PSCs) based on PTB7‐Th:PC₇₁BM. Compared with the control device without CIL, PSCs with PSBMA CILs show significant enhancement on the resulting performance, and the highest power conversion efficiency (PCE) of 8.27% is achieved. Under parallel conditions, PSCs with PSBMA as CIL show comparable performance than those with widely used poly[(9,9‐bis(30‐(N,N‐dimethylamino)propyl)‐2,7‐fluorene)‐alt‐2,7‐(9,9‐ioctylfluorene)] as CIL. The polar groups of PSBMA not only provide a solvent orthogonal solubility in the process of preparation of the devices but also lead to interfacial dipole to the electrode, which promises a better energy level alignment. In addition, PSBMA‐based devices show better abilities of hole blocking. These results indicate that the zwitterionic polymer PSBMA should be a promising CIL in PSC‐based narrow‐bandgap polymers.

中文翻译：

非共轭两性离子聚合物：阴极界面层，可与窄带隙聚合物太阳能电池的PFN媲美

基于PTB7-Th：PC ₇₁ BM的聚合物太阳能电池（PSC）中，一种非共轭的，可溶于醇的两性离子聚合物聚甲基磺基甜菜碱甲基丙烯酸酯（由PSBMA表示）用作阴极界面层（CIL）。与不带CIL的控制设备相比，带PSBMA CIL的PSC在性能上有显着提高，并且实现了8.27％的最高功率转换效率（PCE）。下平行的条件下，与作为PSBMA CIL的PSC显示出比那些广泛使用的聚[（9,9-双（30-（比较的性能Ñ，Ñ二甲基氨基）丙基）-2,7-芴） -中高音-2,7-（9,9-辛基芴）]作为CIL。PSBMA的极性基团不仅在器件的制备过程中提供了与溶剂正交的溶解度，而且还导致与电极的界面偶极子化，从而保证了更好的能级对准。此外，基于PSBMA的设备还具有更好的孔洞阻挡能力。这些结果表明，两性离子聚合物PSBMA在基于PSC的窄带隙聚合物中应该是很有前途的CIL。

更新日期：2018-03-08

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