Achieving high performance organic solar cells with a closer π–π distance in branched alkyl-chain acceptors,Journal of Materials Chemistry A

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Achieving high performance organic solar cells with a closer π–π distance in branched alkyl-chain acceptors
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2023-03-28 , DOI: 10.1039/d3ta01049j
Pu Tan ₁ , Congcong Cao ₁ , Yue Cheng ₁ , Hui Chen ₁ , Hanjian Lai ₁ , Yulin Zhu _{1,

2} , Liang Han ₁ , Jianfei Qu ₁ , Nan Zheng ₃ , Yuanzhu Zhang ₁ , Feng He _{1,

4}

Affiliation

Side-chain functional groups have been shown to not only ensure solubility but also influence molecular packing behavior, and side-chain modification is an important strategy in the optimization of photovoltaic performance. Instead of focusing on the size of the alkyl side chains, we have investigated the influence of side-chain configurations on the properties of acceptors and organic solar cells (OSCs). Two acceptor molecules, BTIC-TCl-b and BTIC-TCl-l were designed by changing the linear configuration of alkyl chain substituents on thiophene rings to a branched structure. The results show that the branched configuration of the side-chain can significantly improve the planarity and reduce the π⋯π distances, leading to a more compact 3D-network structure. With the polymer donor PBDB-TF, an outstanding power conversion efficiency (PCE) of 16.17% was achieved by BTIC-TCl-b, which is significantly higher than that found with BTIC-TCl-l. Our study offers new insights for side-chain modification, regulation of the aggregation state, and optimization of photovoltaic performance.

中文翻译：

在支链烷基链受体中实现具有更近 π-π 距离的高性能有机太阳能电池

侧链官能团已被证明不仅可以确保溶解性，还可以影响分子堆积行为，侧链修饰是优化光伏性能的重要策略。我们没有关注烷基侧链的大小，而是研究了侧链构型对受体和有机太阳能电池 (OSC) 特性的影响。两个受体分子，BTIC-TCl- b和BTIC-TCl- l是通过将噻吩环上烷基链取代基的线性构型改变为支化结构而设计的。结果表明，侧链的分支配置可以显着提高平面度并减少 π⋯π 距离，从而导致更紧凑的 3D 网络结构。使用聚合物供体 PBDB-TF， BTIC-TCl- b实现了 16.17% 的出色功率转换效率 (PCE) ，明显高于BTIC-TCl- l。我们的研究为侧链修饰、聚集状态的调节和光伏性能的优化提供了新的见解。

更新日期：2023-03-28

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