Chen Hongbin, Liang Huazhe, Guo Ziqi, Zhu Yu, Zhang Zhe, Li Zhixiang, Cao Xiangjian, Wang Haohui, Feng Wanying, Zou Yalu, Meng Lingxian, Xu Xiaoyun, Kan Bin, Li Chenxi, Yao Zhaoyang, Wan Xiangjian, Ma Zaifei, Chen Yongsheng
State Key Laboratory and Institute of Elemento-Organic Chemistry, The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, 300071, China.
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China.
Angew Chem Int Ed Engl. 2022 Oct 10;61(41):e202209580. doi: 10.1002/anie.202209580. Epub 2022 Aug 31.
Halogenation of terminal of acceptors has been shown to give dramatic improvements in power conversion efficiencies (PCEs) of organic solar cells (OSCs). Similar significant results could be expected from the halogenation of the central units of state-of-the-art Y-series acceptors. Herein, a pair of acceptors, termed CH6 and CH4, featuring a conjugation-extended phenazine central unit with and without fluorination, have been synthesized. The fluorinated CH6 has enhanced molecular interactions and crystallinity, superior fibrillar network morphology and improved charge generation and transport in blend films, thus affording a higher PCE of 18.33 % for CH6-based binary OSCs compared to 16.49 % for the non-fluorinated CH4. The new central site offers further opportunities for structural optimization of Y-series molecules to afford better-performed OSCs and reveals the effectiveness of fluorination on central units.
已证明对受体末端进行卤化可显著提高有机太阳能电池（OSC）的功率转换效率（PCE）。对于最先进的Y系列受体的中心单元进行卤化，预计也会得到类似的显著结果。在此，合成了一对受体，称为CH6和CH4，它们具有共轭扩展的吩嗪中心单元，且一个有氟化、一个没有。氟化的CH6具有增强的分子间相互作用和结晶度、优异的纤维状网络形态，以及在共混膜中改善的电荷产生和传输，因此基于CH6的二元有机太阳能电池的PCE更高，为18.33%，而非氟化的CH4为16.49%。新的中心位点为Y系列分子的结构优化提供了更多机会，以获得性能更好的有机太阳能电池，并揭示了对中心单元进行氟化的有效性。
