Linear Regulating of Polymer Acceptor Aggregation with Short Alkyl Chain Units Enhances All-Polymer Solar Cells’ Efficiency,Macromolecular Rapid Communications

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Linear Regulating of Polymer Acceptor Aggregation with Short Alkyl Chain Units Enhances All-Polymer Solar Cells’ Efficiency
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2022-11-15 , DOI: 10.1002/marc.202200753
Jinjing Qiu ₁ , Miao Liu ₁ , Yang Wang ₁ , Xinxin Xia ₂ , Qi Liu ₁ , Xia Guo ₁ , Xinhui Lu ₂ , Maojie Zhang ₁

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The power conversion efficiency (PCE) of all-polymer solar cells (all-PSCs) has ascended rapidly arising from the development of polymerized small-molecule acceptor materials. However, numerous insulating long alkyl chains, which ensure the solubility of the polymer, result in inferior aggregation and charge mobility. Herein, this study proposes a facile random copolymerization strategy of two small molecule acceptor units with different lengths of alkyl side chains and synthesizes a series of polymer acceptors PYT-EHx, where x is the percentage of the short alkyl chain units. The aggregation strength and charge mobility of the acceptors rise linearly with increasing the proportion of short alkyl chain units. Thus, the PYT-EH20 reaches balanced aggregation with the star polymer donor PBDB-T, resulting in optimal morphology, fastest carrier transport, and reduced recombination and energy loss. Consequently, the PYT-EH20-based device yields a 14.8% PCE, a 16% improvement over the control PYT-EH0-based device, accompanied by an increase in open-circuit voltage (V_oc), short-circuit current density (J_sc), and fill factor (FF). This work demonstrates that the random copolymerization strategy with short alkyl chain insertion is an effective avenue for developing high-performance polymer acceptors, which facilitates further advances in the efficiency of all-PSCs.

中文翻译：

具有短烷基链单元的聚合物受体聚集的线性调节提高了全聚合物太阳能电池的效率

全聚合物太阳能电池（all-PSC）的功率转换效率（PCE）随着聚合小分子受体材料的发展而迅速提升。然而，许多确保聚合物溶解性的绝缘长烷基链导致较差的聚集和电荷迁移率。在此，这项研究提出了一种简单的随机共聚策略，即两个具有不同长度烷基侧链的小分子受体单元，并合成了一系列聚合物受体 PYT-EH x，其中x是短烷基链单元的百分比。受体的聚集强度和电荷迁移率随着短烷基链单元比例的增加而线性上升。因此，PYT-EH20 与星形聚合物供体 PBDB-T 达到平衡聚集，从而获得最佳形态、最快的载流子传输并减少重组和能量损失。因此，基于 PYT-EH20 的器件产生了 14.8% 的 PCE，比基于 PYT-EH0 的控制器件提高了 16%，同时开路电压 (Voc)、短路电流_密度( J _SC) 和填充因子 (FF)。这项工作表明，插入短烷基链的无规共聚策略是开发高性能聚合物受体的有效途径，有助于进一步提高全 PSC 的效率。

更新日期：2022-11-15

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