Wang Yuxin, Jia Xinyuan, Ma Kangqiao, Zhao Wenkai, Liang Huazhe, Yao Zhaoyang, Long Guankui, Li Chenxi, Wan Xiangjian, Chen Yongsheng
State Key Laboratory of Element-Organic Chemistry, Frontiers Science Center for New Organic Matter, The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, Institute of Polymer Chemistry, Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, 300071, China.
School of Materials Science and Engineering, National Institute for Advanced Materials, Renewable Energy Conversion and Storage Center (RECAST), Nankai University, Tianjin, 300350, China.
Macromol Rapid Commun. 2025 Jan;46(2):e2400687. doi: 10.1002/marc.202400687. Epub 2024 Nov 3.
Branch-connected dimerized acceptors can take full advantages of four end units in enhancing molecular packing comparing to that of terminal-connected ones, thus potentially reaching the best balance between stability and power conversion efficiency (PCE) of organic solar cells (OSCs). Herein, two branch-connected dimerized acceptors, namely D1 and D2, are developed by employing bithiophene and difluorinated bithiophene as linker groups, respectively. Induced by the fluorine atoms on linker group, D2 affords a larger molar extinction coefficient, more importantly, the optimized nanoscale film morphology and superior charge transport behavior comparing to D1. Consequently, D2-based binary OSCs render a good PCE of 16.66%, outperforming that of 15.08% for D1-based ones. This work highlights the great significance of linker group screening in designing high-performance branch-connected dimerized acceptors.
与端基连接的二聚体受体相比，支链连接的二聚体受体在增强分子堆积方面能够充分利用四个端基单元，因此有可能在有机太阳能电池（OSC）的稳定性和功率转换效率（PCE）之间达到最佳平衡。在此，分别采用联噻吩和二氟联噻吩作为连接基团，开发了两种支链连接的二聚体受体，即D1和D2。受连接基团上氟原子的诱导，D2具有更大的摩尔消光系数，更重要的是，与D1相比，其具有优化的纳米级薄膜形态和优异的电荷传输行为。因此，基于D2的二元有机太阳能电池具有16.66%的良好功率转换效率，优于基于D1的电池（15.08%）。这项工作突出了连接基团筛选在设计高性能支链连接二聚体受体方面的重大意义。
