Two new wide bandgap block copolymers (PL1 and PL2) with porphyrin‐incorporated side chains are designed and used as electron donors for solution‐processed bulk heterojunction polymer solar cells. The photophysical, electrochemical, and photovoltaic properties, charge transport mobility and film morphology of these two block copolymers are investigated. Detailed investigations reveal that the different alkyl groups and electron‐withdrawing substituents on the porphyrin pendant units have significant influence on the polymer solubility, absorption energy level, band gap, and charge separation in the bulk‐heterojunction thin films, and thus the overall photovoltaic performances. Organic photovoltaic devices derived from these copolymers and ([6,6]‐phenyl‐C₇₁‐butyric acid methyl ester) (PC₇₁BM) acceptor show the best power conversion efficiencies of 5.83% and 7.14%, respectively. These results show that the inclusion of a certain proportion of side chain porphyrin group as a pendant in the traditional donor‐acceptor (D‐A) type polymer can broaden the molecular absorption range and become a full‐color absorbing molecule. The size of the porphyrin pendant also has an obvious effect on the properties of the molecule.

中文翻译：

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基于新型无规共聚物并结合有卟啉的侧链的高效聚合物太阳能电池

设计了两种带有卟啉结合侧链的新型宽带隙嵌段共聚物（PL1和PL2），并用作溶液处理的本体异质结聚合物太阳能电池的电子给体。研究了这两种嵌段共聚物的光物理，电化学和光伏性质，电荷迁移率和薄膜形态。详细的研究表明，卟啉侧基单元上的不同烷基和吸电子取代基对本体异质结薄膜中的聚合物溶解度，吸收能级，带隙和电荷分离有很大影响，从而影响了整个光伏性能。由这些共聚物和（[6,6] -phenyl-C _71-丁酸甲酯）（PC ₇₁BM）受体的最佳功率转换效率分别为5.83％和7.14％。这些结果表明，在传统的供体-受体（D-A）型聚合物中包含一定比例的侧链卟啉基团作为侧基可以拓宽分子吸收范围，并成为全色吸收分子。卟啉侧基的大小对分子的性质也有明显的影响。