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首页> 外文期刊>Advanced Functional Materials >Correlated Donor/Acceptor Crystal Orientation Controls Photocurrent Generation in All-Polymer Solar Cells
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Correlated Donor/Acceptor Crystal Orientation Controls Photocurrent Generation in All-Polymer Solar Cells

机译：相关的供体/受体晶体取向控制全聚合物太阳能电池中的光电流产生

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摘要

New polymers with high electron mobilities have spurred research in organic solar cells using polymeric rather than fullerene acceptors due to their potential of increased diversity, stability, and scalability. However, all-polymer solar cells have struggled to keep up with the steadily increasing power conversion efficiency of polymer:fullerene cells. The lack of knowledge about the dominant recombination process as well as the missing concluding picture on the role of the semi-crystalline microstructure of conjugated polymers in the free charge carrier generation process impede a systematic optimization of all-polymer solar cells. These issues are examined by combining structural and photo-physical characterization on a series of poly(3-hexylthiophene) (donor) and P(NDI2OD-T2) (acceptor) blend devices. These experiments reveal that geminate recombination is the major loss channel for photo-excited charge carriers. Advanced X-ray and electron-based studies reveal the effect of chloronaphtha-lene co-solvent in reducing domain size, altering domain purity, and reorienting the acceptor polymer crystals to be coincident with those of the donor. This reorientation correlates well with the increased photocurrent from these devices. Thus, efficient split-up of geminate pairs at polymer/polymer interfaces may necessitate correlated donor/acceptor crystal orientation, which represents an additional requirement compared to the isotropic fullerene acceptors.
机译：具有高电子迁移率的新型聚合物刺激了使用聚合物而不是富勒烯受体的有机太阳能电池的研究，因为它们具有增加多样性，稳定性和可扩展性的潜力。然而，全聚合物太阳能电池一直在努力跟上聚合物：富勒烯电池不断提高的功率转换效率。缺乏有关主要重组过程的知识以及关于共轭聚合物的半结晶微结构在自由电荷载流子生成过程中的作用的结论图像的缺失，阻碍了全聚合物太阳能电池的系统优化。通过在一系列聚（3-己基噻吩）（给体）和P（NDI2OD-T2）（受体）混合装置上结合结构和光物理特性，研究了这些问题。这些实验表明，成对重组是光激发载流子的主要损失通道。先进的X射线和基于电子的研究揭示了氯萘酚助溶剂在减小畴尺寸，改变畴纯度以及使受体聚合物晶体与供体晶体重合方面的作用。这种重新定向与来自这些器件的增加的光电流很好地相关。因此，在聚合物/聚合物界面处的双联化合物的有效拆分可能需要相关的供体/受体晶体取向，与各向同性富勒烯受体相比，这代表了额外的要求。

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  • 来源
    《Advanced Functional Materials》 |2014年第26期|4068-4081|共14页
  • 作者

    Marcel Schubert; Brian A. Collins; Hannah Mangold; Ian A. Howard; Wolfram Schindler; Koen Vandewal; Steffen Roland; Jan Behrends; Felix Kraffert; Robert Steyrleuthner; Zhihua Chen; Konstantinos Fostiropoulos; Robert Bittl; Alberto Salleo; Antonio Facchetti; Frederic Laquai; Harald W. Ade; Dieter Neher;

  • 作者单位

    University of Potsdam Institute of Physics and Astronomy 14476 Potsdam, Germany;

    North Carolina State University Department of Physics Raleigh, NC 27695, USA,National Institute of Standards and Technology (NIST) Gaithersburg, USA;

    Max-Planck-lnstitute for Polymer Research (MPI-P) 55128 Mainz, Germany;

    Max-Planck-lnstitute for Polymer Research (MPI-P) 55128 Mainz, Germany;

    Helmholtz-Zentrum Berlin (HZB) Institute for Heterogeneous Material Systems 14109 Berlin, Germany;

    Stanford University Department of Materials Science Stanford, CA 94305-4034, USA;

    University of Potsdam Institute of Physics and Astronomy 14476 Potsdam, Germany;

    Free University Berlin Department of Physics 14195 Berlin, Germany;

    Free University Berlin Department of Physics 14195 Berlin, Germany;

    University of Potsdam Institute of Physics and Astronomy 14476 Potsdam, Germany,Free University Berlin Department of Physics 14195 Berlin, Germany;

    Polyera Corporation IL 60077, USA;

    Helmholtz-Zentrum Berlin (HZB) Institute for Heterogeneous Material Systems 14109 Berlin, Germany;

    Free University Berlin Department of Physics 14195 Berlin, Germany;

    Stanford University Department of Materials Science Stanford, CA 94305-4034, USA;

    Polyera Corporation IL 60077, USA;

    Max-Planck-lnstitute for Polymer Research (MPI-P) 55128 Mainz, Germany;

    North Carolina State University Department of Physics Raleigh, NC 27695, USA;

    University of Potsdam Institute of Physics and Astronomy 14476 Potsdam, Germany;

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