Direct Arylation Polycondensation-Derived Polythiophene Achieves Over 16% Efficiency in Binary Organic Solar Cells via Tuning Aggregation and Miscibility,Advanced Energy Materials

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Direct Arylation Polycondensation-Derived Polythiophene Achieves Over 16% Efficiency in Binary Organic Solar Cells via Tuning Aggregation and Miscibility
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2024-08-27 , DOI: 10.1002/aenm.202402239
Xuwen Zhang ₁ , Tao Zhang ₂ , Ziqi Liang ₁ , Yibo Shi ₁ , Saimeng Li ₁ , Chenhui Xu ₁ , Miaomiao Li ₁ , Long Ye ₁ , Jianhui Hou ₂ , Yanhou Geng ₁

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Polythiophenes are the most appealing donor materials in organic solar cells (OSCs) due to their simple chemical structures. However, the top-performance polythiophenes are typically synthesized via Stille polycondensation, which is problematic due to significant toxicity and poor atom economy. By contrast, direct arylation polycondensation (DArP) is an eco-friendly, and atom-efficient alternative for synthesizing conjugated polymers, while the best efficiency for DArP-derived polythiophenes is below 12%. This study reports a series of polythiophene-based donors synthesized via DArP. Among these, PT4F-Th reaches a power conversion efficiency (PCE) of 16.4%, which not only matches the current record for polythiophene-based donor materials, but also marks the highest PCE achieved by DArP-derived donors to date. The superior performance of PT4F-Th is largely attributed to its optimal temperature-dependent aggregation behavior and moderate miscibility with acceptors, along with the highest crystallinity among the candidates, resulting in the most favorable blend film morphology. This study underscores the significant potential of DArP-derived polythiophenes in developing high-performance and eco-friendly OSCs.

中文翻译：

直接芳基化缩聚衍生的聚噻吩通过调节聚集和混溶性，在二元有机太阳能电池中实现了超过 16% 的效率

聚噻吩因其简单的化学结构而成为有机太阳能电池（OSC）中最具吸引力的供体材料。然而，高性能的聚噻吩通常是通过 Stille 缩聚合成的，由于毒性大且原子经济性差，这是个问题。相比之下，直接芳基化缩聚（DArP）是合成共轭聚合物的一种环保且原子高效的替代方案，而 DArP 衍生的聚噻吩的最佳效率低于 12%。本研究报告了一系列通过 DArP 合成的基于聚噻吩的供体。其中，PT4F-Th 的功率转换效率（PCE）为 16.4%，不仅追平了目前基于聚噻吩的供体材料的记录，也标志着 DArP 衍生供体达到的最高 PCE。PT4F-Th 的优异性能在很大程度上归功于其最佳的温度依赖性聚集行为和与受体的适度混溶性，以及候选化合物中最高的结晶度，从而产生了最有利的混合膜形态。本研究强调了 DArP 衍生的聚噻吩在开发高性能和环保型 OSC 方面的巨大潜力。

更新日期：2024-08-27

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