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首页> 外文期刊>Advanced Functional Materials >Influence of Blend Morphology and Energetics on Charge Separation and Recombination Dynamics in Organic Solar Cells Incorporating a Nonfullerene Acceptor
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Influence of Blend Morphology and Energetics on Charge Separation and Recombination Dynamics in Organic Solar Cells Incorporating a Nonfullerene Acceptor

机译：混合形态和能量对掺入富勒烯受体的有机太阳能电池中电荷分离和复合动力学的影响

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摘要

Nonfullerene acceptors (NFAs) in blends with highly crystalline donor polymers have been shown to yield particularly high device voltage outputs, but typically more modest quantum yields for photocurrent generation as well as often lower fill factors (FF). In this study, we employ transient optical and optoelectronic analysis to elucidate the factors determining device photocurrent and FF in blends of the highly crystalline donor polymer Pfft3T4T-2OD with the promising NFA FBR or the more widely studied fullerene acceptor PC71BM. Geminate recombination losses, as measured by ultrafast transient absorption spectroscopy, are observed to be significantly higher for PfEBT4T-2OD:FBR blends. This is assigned to the smaller LUMO-LUMO offset of the PffBT4T-2OD:FBR blends relative to PffBT4T-2OD:PC71BM, resulting in the lower photocurrent generation efficiency obtained with FBR. Employing time delayed charge extraction measurements, these geminate recombination losses are observed to be field dependent, resulting in the lower FF observed with Pfft3T4T-2OD:FBR devices. These data therefore provide a detailed understanding of the impact of acceptor design, and particularly acceptor energetics, on organic solar cell performance. Our study concludes with a discussion of the implications of these results for the design of NFAs in organic solar cells.
机译：与高结晶供体聚合物共混的非富勒烯受体（NFA）已显示出特别高的器件电压输出，但通常产生光电流产生的量子产率更适中，并且填充因子（FF）通常更低。在这项研究中，我们采用瞬态光学和光电分析方法来阐明决定高结晶供体聚合物Pfft3T4T-2OD与有前途的NFA FBR或研究更广泛的富勒烯受体PC71BM的混合物中器件光电流和FF的因素。通过PfEBT4T-2OD：FBR共混物，通过超快速瞬态吸收光谱法测得的Geem重组损失明显更高。这归因于PffBT4T-2OD：FBR共混物相对于PffBT4T-2OD：PC71BM较小的LUMO-LUMO偏移，导致FBR产生的光电流产生效率较低。使用延迟的电荷提取测量，观察到这些双联化合物的重组损失与电场有关，从而导致Pfft3T4T-2OD：FBR器件的FF较低。因此，这些数据提供了对受体设计，尤其是受体能量学对有机太阳能电池性能的影响的详细理解。我们的研究最后讨论了这些结果对有机太阳能电池中NFA设计的影响。

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  • 来源
    《Advanced Functional Materials》 |2018年第3期|1704389.1-1704389.11|共11页
  • 作者

    Cha Hyojung; Wheeler Scot; Holliday Sarah; Dimitrov Stoichko D.; Wadsworth Andrew; Lee Hyun Hwi; Baran Derya; McCulloch Iain; Durrant James R.;

  • 作者单位

    Imperial Coll London, Dept Chem, London SW7 2AZ, England|Imperial Coll London, Ctr Plast Elect, London SW7 2AZ, England;

    Imperial Coll London, Dept Chem, London SW7 2AZ, England|Imperial Coll London, Ctr Plast Elect, London SW7 2AZ, England;

    Imperial Coll London, Dept Chem, London SW7 2AZ, England|Imperial Coll London, Ctr Plast Elect, London SW7 2AZ, England;

    Imperial Coll London, Dept Chem, London SW7 2AZ, England|Imperial Coll London, Ctr Plast Elect, London SW7 2AZ, England|Swansea Univ, Coll Engn, SPECIFIC IKC, Swansea SA2 7AX, W Glam, Wales;

    Imperial Coll London, Dept Chem, London SW7 2AZ, England|Imperial Coll London, Ctr Plast Elect, London SW7 2AZ, England;

    POSTECH, Pohang Accelerator Lab, Pohang 37673, Gyeongbuk, South Korea;

    KAUST, KSC, Phys Sci & Engn Div, Thuwal 239556900, Saudi Arabia;

    Imperial Coll London, Dept Chem, London SW7 2AZ, England|Imperial Coll London, Ctr Plast Elect, London SW7 2AZ, England|KAUST, KSC, Phys Sci & Engn Div, Thuwal 239556900, Saudi Arabia;

    Imperial Coll London, Dept Chem, London SW7 2AZ, England|Imperial Coll London, Ctr Plast Elect, London SW7 2AZ, England|Swansea Univ, Coll Engn, SPECIFIC IKC, Swansea SA2 7AX, W Glam, Wales;

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  • 关键词

    field-dependent generation; geminate recombination; nonfullerene acceptors; nongeminate recombination; organic solar cells;

    机译：场相关发电;双键重组;非富勒烯受体;双键重组;有机太阳能电池;

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