A Facile Method to Fine-Tune Polymer Aggregation Properties and Blend Morphology of Polymer Solar Cells Using Donor Polymers with Randomly Distributed Alkyl Chains
A Facile Method to Fine-Tune Polymer Aggregation Properties and Blend Morphology of Polymer Solar Cells Using Donor Polymers with Randomly Distributed Alkyl Chains
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DOI：
10.1002/aenm.201701895
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发表时间：
2018-02-26
影响因子：
27.8
通讯作者：
Yan, He
中科院分区：
文献类型：
--
作者：
Yao, Huatong;Li, Yunke;Yan, He
聚合物太阳能电池(PSCs)的器件性能很大程度上依赖于共混物的形态。改善PSC性能的策略之一是侧链工程，它在控制聚合物的聚集性质从而控制给体-受体共混物的结构域结晶度/纯度方面起着重要作用。特别是，对于一类具有强烈温度依赖聚集性质的高性能给体聚合物，其器件性能对烷基链的大小非常敏感，只有优化的奇数烷基链才能获得最佳的器件性能。然而，奇数烷基链的合成路线昂贵且复杂，难以大规模合成。在这里，这项研究提出了一种简便的方法，通过使用两个偶数随机分布的烷基链混合物的给体聚合物来优化聚集体的性质和共混形态。在一个模型聚合物体系中，本研究表明，通过改变混合比，可以系统地调节由2-辛基十二烷基链和2-正十四烷基烷基链组成的无规聚合物的结构和电子性质，并且可以获得高的功率转换效率(11.1%)。这种方法提高了供体聚合物的可扩展性，从而促进了PSCs的商业化。
The device performance of polymer solar cells (PSCs) is strongly dependent on the blend morphology. One of the strategies for improving PSC performance is side-chain engineering, which plays an important role in controlling the aggregation properties of the polymers and thus the domain crystallinity/purity of the donor-acceptor blends. In particular, for a family of high-performance donor polymers with strong temperature-dependent aggregation properties, the device performances are very sensitive to the size of alkyl chains, and the best device performance can only be achieved with an optimized odd-numbered alkyl chain. However, the synthetic route of odd-numbered alkyl chains is costly and complicated, which makes it difficult for large-scale synthesis. Here, this study presents a facile method to optimize the aggregation properties and blend morphology by employing donor polymers with a mixture of two even-numbered, randomly distributed alkyl chains. In a model polymer system, this study suggests that the structural and electronic properties of the random polymers comprising a mixture of 2-octyldodecyl and 2-decyltetradecyl alkyl chains can be systematically tuned by varying the mixing ratio, and a high power conversion efficiency (11.1%) can be achieved. This approach promotes the scalability of donor polymers and thus facilitates the commercialization of PSCs.