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Self-Assembly of Selective Interfaces in Organic Photovoltaics

机译：有机光伏中选择性界面的自组装

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摘要

The composition of polymer-fullerene blends is a critical parameter for achieving high efficiencies in bulk-heterojunction (BHj) organic photovoltaics. Achieving the "right" materials distribution is crucial for device optimization as it greatly influences charge-carrier mobility. The effect of the vertical concentration profile of materials in spin-coated BHjs on device properties has stirred particularly vigorous debate. Despite available literature on this subject, the results are often contradictory and inconsistent, likely due to differences in sample preparation and experimental considerations. To reconcile published results, the influence of heating, surface energy, and solvent additives on vertical segregation and doping in polymer-fullerene BHJ organic photovoltaics are studied using neutron reflectometry and near edge X-ray absorption fine structure spectroscopy. It is shown that surface energies and solvent additives greatly impact heat-induced vertical segregation. Interface charging due to Fermi level mismatch increases (6,6)-phenyl-C_(67)butyric acid methyl ester (PCBM)-enrichment at the BHJ/cathode interface. Current-voltage measurements show that self-assembly of interfaces affects the open-circuit voltage, resulting in clear changes to the power conversion efficiency.
机译：聚合物-富勒烯共混物的组成是在体-异质结（BHj）有机光伏中实现高效率的关键参数。实现“正确的”材料分布对于设备优化至关重要，因为它会极大地影响电荷载流子迁移率。旋涂BHjs中材料的垂直浓度分布对器件性能的影响引起了特别激烈的争论。尽管有关于该主题的文献，但结果往往是矛盾且不一致的，这可能是由于样品制备和实验考虑因素的差异所致。为了调和已发表的结果，使用中子反射法和近边缘X射线吸收精细结构光谱研究了加热，表面能和溶剂添加剂对聚合物-富勒烯BHJ有机光伏电池中垂直偏析和掺杂的影响。结果表明，表面能和溶剂添加剂极大地影响了热诱导的垂直偏析。由于费米能级不匹配导致的界面电荷增加了BHJ /阴极界面处的（6,6）-苯基-C_（67）丁酸甲酯（PCBM）富集。电流电压测量表明，接口的自组装会影响开路电压，从而导致功率转换效率发生明显变化。

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  • 来源
    《Advanced Functional Materials》 |2013年第15期|1935-1946|共12页
  • 作者

    Scott A. Mauger; Lilian Chang; Stephan Friedrich; Christopher W. Rochester; David M. Huang; Peng Wang; Adam J. Moule;

  • 作者单位

    Department of Chemical Engineering and Materials Science University of California Davis, Davis, CA 95616, USA;

    Department of Chemical Engineering and Materials Science University of California Davis, Davis, CA 95616, USA;

    Advanced Detector Group Lawrence Livermore National Laboratory, Livermore, CA 94550, USA;

    Department of Chemical Engineering and Materials Science University of California Davis, Davis, CA 95616, USA;

    School of Chemistry and Physics University of Adelaide SA 5005, Australia;

    Manuel Lujan Neutron Scattering Center Los Alamos National Laboratory, Los Alamos, NM 87545, USA;

    Department of Chemical Engineering and Materials Science University of California Davis, Davis, CA 95616, USA;

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