Optimizing the Charge Carrier and Light Management of Nonfullerene Acceptors for Efficient Organic Solar Cells with Small Nonradiative Energy Losses

Yanan Shi; Junxiu Pan; Jianwei Yu; Jianqi Zhang; Feng Gao; Kun Lu; Zhixiang Wei

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Optimizing the Charge Carrier and Light Management of Nonfullerene Acceptors for Efficient Organic Solar Cells with Small Nonradiative Energy Losses

机译：优化具有小型无抗体能量损失的高效有机太阳能电池的非勒德兰人受体的电荷载波和光管理

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The photovoltaic properties and energy losses of organic solar cells (OSCs) based on nonfullerene acceptors (NFAs) are highly dependent on their molecular structures and aggregation morphologies. Charge carrier and light managements are important to optimize NFA molecules. Herein, four NFAs with different alkyl substituents and end groups, named BTP-C11-N2F, BTP-C9-N2F, BTP-C9-IC4F, and BTP-C9-N4F, are designed and synthesized by side-chain shortening, endacceptor π-extension, and fluorination. As a result, a favorable morphology is achieved in BTP-C9-N4F-based OSCs by using typical high bandgap polymer PM6 as a donor, and this system obtains the highest power conversion efficiency of 17.0% with a short circuit current (J_(sc)) of 26.3 mA cm~(-2), an open circuit current (V_(oc)) of 0.85 V, and a fill factor (FF) of 75.7%. In addition, its light (J_(sc)) and charge carrier (V_(oc) × FF) managements relative to the Shockley–Queisser limit are also increased. Extending the conjugation of the end groups increased the energy levels of NFAs and enabled an Eloss of 0.50 eV with a nonradiative recombination loss of as low as 0.20 eV in BTP-C11-N2F-based OSCs. This work provides an efficient strategy to optimize the molecular structures of nonfullerene acceptors and further improve the properties of OSCs.

机译：基于非氟联受体（NFAs）的有机太阳能电池（OSC）的光伏性能和能量损失高度依赖于其分子结构和聚集形态。收费载波和光管理对于优化NFA分子很重要。在此，通过侧链缩短，endacceptorπ设计和合成了具有不同烷基取代基的四种具有不同烷基取代基和结束基团的NFA，名为BTP-C11-N2F，BTP-C11-N2F，BTP-C11-N2F，BTP-C9-IC4F和BTP-C9-N4F - 内容和氟化。结果，通过使用典型的高带隙聚合物PM6作为供体，在基于BTP-C9-N4F的OSC中实现了有利的形态，并且该系统以短路电流获得的最高功率转换效率为17.0％（J_（SC）））26.3 mA cm〜（-2），开路电流（V_（v_（oc））为0.85V，填充因子（FF）为75.7％。另外，它的光（J_（SC））和电荷载波（V_（OC）×FF）管理相对于Shockley-Queiss限制也会增加。延伸结束组的缀合增加了NFA的能量水平，使得在基于BTP-C11-N2F的OSC中的0.20eV的非相互作用重组损失使0.50eV的ELOSE具有0.50eV。这项工作提供了有效的策略来优化非氟伦烯受体的分子结构，进一步改善OSC的性质。

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《Solar RRL》 |2021年第4期|2100008.1-2100008.10|共10页
作者
Yanan Shi; Junxiu Pan; Jianwei Yu; Jianqi Zhang; Feng Gao; Kun Lu; Zhixiang Wei;
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Chinese Academy of Sciences(CAS)Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China;

Chinese Academy of Sciences(CAS)Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 China Department of chemistry School of Science Tianjin University Tianjin 300072 China;

Department of Physics Chemistry and Biology(IFM)Linkoeping University SE-58183 Linkoeping Sweden;

Chinese Academy of Sciences(CAS)Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China;

Department of Physics Chemistry and Biology(IFM)Linkoeping University SE-58183 Linkoeping Sweden;

Chinese Academy of Sciences(CAS)Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China;

Chinese Academy of Sciences(CAS)Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China;

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正文语种 eng
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alkyl substituents; end groups; nonfullerene acceptors; nonradiative recombination loss; organic solar cells;

机译：烷基取代基;结束群体;非勒德兰人受体;非相互作用重组损失;有机太阳能电池;

Optimizing the Charge Carrier and Light Management of Nonfullerene Acceptors for Efficient Organic Solar Cells with Small Nonradiative Energy Losses

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