Li Jingyi, Zhang Zhenyu, Ran Guangliu, Xu Xiaoyun, Zhang Cai'e, Liu Wenlong, Zheng Xinming, Li Dawei, Xu Xinjun, Liu Yahui, Tang Zheng, Zhang Wenkai, Bo Zhishan
Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China.
Department of Physics and Applied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing, 100875, P. R. China.
Small. 2022 Sep;18(35):e2203454. doi: 10.1002/smll.202203454. Epub 2022 Aug 7.
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.
受简化非富勒烯受体合成及建立分子结构与光伏性能之间关系的驱动，设计并通过几个高产率步骤合成了两种异构的非稠环电子受体（邻位 - TT - Cl和间位 - TT - Cl），其性质可通过改变侧链来调节。具有V形侧链的邻位 - TT - Cl诱导形成主导的J - 聚集，并且比具有线性侧链的间位 - TT - Cl表现出更好的溶解性和更有序的堆积。因此，基于邻位 - TT - Cl的共混膜比基于间位 - TT - Cl的共混膜产生更好的相形态和电荷传输。最后，基于邻位 - TT - Cl的器件的功率转换效率为12.84%，远高于基于间位 - TT - Cl的器件（6.54%）。这项工作突出了侧链工程对提高非稠环电子受体光伏性能的重要性。
