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首页> 外文期刊>Advanced Functional Materials >Suppressing Kinetic Aggregation of Non-Fullerene Acceptor via Versatile Alloy States Enables High-Efficiency and Stable Ternary Polymer Solar Cells
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Suppressing Kinetic Aggregation of Non-Fullerene Acceptor via Versatile Alloy States Enables High-Efficiency and Stable Ternary Polymer Solar Cells

机译：通过通用合金状态抑制非富勒烯受体的动力学聚集使得高效稳定的三元聚合物太阳能电池

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摘要

Despite considerable advances devoted to improving the operational stability of organic solar cells (OSCs), the metastable morphology degradation remains a challenging obstacle for their practical application. Herein, the stabilizing function of the alloy states in the photoactive layer from the perspective of controlling the aggregation characteristics of non-fullerene acceptors (NFAs), is revealed. The alloy-like model is adopted separately into host donor and acceptor materials of the state-of-the-art binary PM6:BTP-4Cl blend with the self-stable polymer acceptor PDI-2T and small molecule donor DRCN5T as the third components, delivering the simultaneously enhanced photovoltaic efficiency and storage stability. In such ternary systems, two separate arguments can rationalize their operating principles: (1) the acceptor alloys strengthen the conformational rigidity of BTP-4Cl molecules to restrain the intramolecular vibrations for rapid relaxation of high-energy excited states to stabilize BTP-4Cl acceptor. (2) The donor alloys optimize the fibril network microstructure of PM6 polymer to restrict the kinetic diffusion and aggregation of BTP-4Cl molecules. According to the superior morphological stability, non-radiative defect trapping coefficients can be drastically reduced without forming the long-lived, trapped charge species in ternary blends. The results highlight the novel protective mechanisms of engineering the alloy-like composites for reinforcing the long-term stability of NFA-based ternary OSCs.
机译：尽管致力于提高有机太阳能电池（OSC）的操作稳定性，但亚稳态形态劣化仍然是其实际应用的挑战性障碍。这里，揭示了从控制非富勒烯受体（NFAS）的聚集特征的角度来看，合金状态在光活性层中的稳定功能。合金样模型是单独采用的，进入宿主供体和最新二进制PM6：BTP-4CL与自稳定聚合物受体PDI-2T和小分子供体DRCN5T作为第三组分的混合，提供同时增强的光伏效率和存储稳定性。在这样的三元系统中，两个单独的参数可以合理化其操作原理：（1）受体合金加强BTP-4CL分子的构象刚性，以抑制高能量激发状态快速松弛的分子内振动，以稳定BTP-4CL受体。 （2）供体合金优化PM6聚合物的原纤维网络微观结构，限制BTP-4CL分子的动力学扩散和聚集。根据优异的形态稳定性，非辐射缺陷捕获系数可以大幅减少而不形成三元共混物中的长寿命的捕获电荷物质。结果突出了工程新颖的合金复合材料的新型保护机制，用于加强基于NFA的三元OSC的长期稳定性。

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  • 来源
    《Advanced Functional Materials》 |2021年第20期|2100316.1-2100316.14|共14页
  • 作者

    Zhang Kang-Ning; Guo Jia-Jia; Zhang Liu-Jiang; Qin Chao-Chao; Yin Hang; Gao Xing-Yu; Hao Xiao-Tao;

  • 作者单位

    Shandong Univ Sch Phys State Key Lab Crystal Mat Jinan 250100 Shandong Peoples R China;

    Henan Normal Univ Henan Key Lab Infrared Mat & Spectrum Measures & Xinxiang 453007 Henan Peoples R China;

    Chinese Acad Sci Shanghai Adv Res Inst Shanghai Synchrotron Radiat Facil SSRF Zhangjiang Lab 239 Zhangheng Rd Shanghai 201204 Peoples R China;

    Henan Normal Univ Henan Key Lab Infrared Mat & Spectrum Measures & Xinxiang 453007 Henan Peoples R China;

    Shandong Univ Sch Phys State Key Lab Crystal Mat Jinan 250100 Shandong Peoples R China;

    Chinese Acad Sci Shanghai Adv Res Inst Shanghai Synchrotron Radiat Facil SSRF Zhangjiang Lab 239 Zhangheng Rd Shanghai 201204 Peoples R China;

    Shandong Univ Sch Phys State Key Lab Crystal Mat Jinan 250100 Shandong Peoples R China|Univ Melbourne Sch Chem ARC Ctr Excellence Exciton Sci Parkville Vic 3010 Australia;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    alloy#8208; like model; molecular aggregation; non#8208; fullerene acceptors; non#8208; radiative defect trapping; organic solar cells;

    机译：合金＆＃8208;像模型;分子聚集;非＆＃8208;富勒烯受体;非＆＃8208;辐射缺陷俘获;有机太阳能电池;

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