Motivated by simplifying the synthesis of nonfullerene acceptor and establishing the relation between molecular structure and photovoltaic performance, two isomeric nonfused ring electron acceptors (o-TT-Cl and m-TT-Cl), whose properties can be adjusted by changing the side chains, are designed and synthesized with several high-yield steps. o-TT-Cl with V-shaped side chain induces a dominated J-aggregation and displays much better solubility and more ordered packing than m-TT-Cl with linear side chain. Thus, the o-TT-Cl-based blend film generates better phase morphology and charge transport than m-TT-Cl-based one. Finally, the power conversion efficiency of o-TT-Cl-based devices is 12.84%, which is much higher than that of m-TT-Cl-based ones (6.54%). This work highlights the importance of side chains engineering on improving photovoltaic performance of nonfused ring electron acceptors.

中文翻译：

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具有 V 形侧链的高性能非稠环电子受体

通过简化非富勒烯受体的合成并建立分子结构与光伏性能之间的关系，两种异构的非稠环电子受体（o -TT-Cl和m -TT-Cl）的性质可以通过改变侧链来调节，通过几个高产率步骤设计和合成。具有 V 形侧链的o -TT-Cl 诱导主要的J聚集，并显示出比具有线性侧链的m -TT-Cl更好的溶解度和更有序的堆积。因此，基于o -TT-Cl 的共混膜产生比m更好的相形态和电荷传输-TT-Cl 基之一。最后，基于o -TT-Cl 的器件的功率转换效率为 12.84%，远高于基于m -TT-Cl 的器件（6.54%）。这项工作强调了侧链工程对提高非稠环电子受体光伏性能的重要性。