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首页> 外文期刊>Advanced energy materials >Explaining the Fill-Factor and Photocurrent Losses of Nonfullerene Acceptor-Based Solar Cells by Probing the Long-Range Charge Carrier Diffusion and Drift Lengths
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Explaining the Fill-Factor and Photocurrent Losses of Nonfullerene Acceptor-Based Solar Cells by Probing the Long-Range Charge Carrier Diffusion and Drift Lengths

机译：通过探测远程电荷载体扩散和漂移长度来解释基于非硬化受体的太阳能电池的填充因子和光电流损耗

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摘要

Organic solar cells (OSC) nowadays match their inorganic competitors in terms of current production but lag behind with regards to their open-circuit voltage loss and fill-factor, with state-of-the-art OSCs rarely displaying fill-factor of 80% and above. The fill-factor of transport-limited solar cells, including organic photovoltaic devices, is affected by material and device-specific parameters, whose combination is represented in terms of the established figures of merit, such as theta and alpha. Herein, it is demonstrated that these figures of merit are closely related to the long-range carrier drift and diffusion lengths. Further, a simple approach is presented to devise these characteristic lengths using steady-state photoconductance measurements. This yields a straightforward way of determining theta and alpha in complete cells and under operating conditions. This approach is applied to a variety of photovoltaic devices-including the high efficiency nonfullerene acceptor blends-and show that the diffusion length of the free carriers provides a good correlation with the fill-factor. It is, finally, concluded that most state-of-the-art organic solar cells exhibit a sufficiently large drift length to guarantee efficient charge extraction at short circuit, but that they still suffer from too small diffusion lengths of photogenerated carriers limiting their fill factor.
机译：当然，有机太阳能电池（OSC）在目前的生产方面与其无机竞争对手相匹配，但在其开放式电路损耗和填充因子方面落后，最先进的OSC很少显示填充因子为80％以上。传输限制太阳能电池（包括有机光伏器件）的填充因子受材料和装置特异性参数的影响，其组合在于确定的优点图，例如θ和α。在此，证明这些优点的图形与远程载波漂移和扩散长度密切相关。此外，提出了一种简单的方法来使用稳态光电导测量来设计这些特征长度。这产生了在完全细胞和操作条件下确定θ和α的直接方式。该方法适用于各种光伏器件 - 包括高效非氟伦烯受体混合物 - 并且表明游离载体的扩散长度与填充因子提供了良好的相关性。最后，结论是，大多数最先进的有机太阳能电池表现出足够大的漂移长度，以保证短路的有效电荷提取，但它们仍然遭受过太小的光发化载体的扩散长度，限制了它们的填充因子。

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  • 来源
    《Advanced energy materials》 |2021年第22期|2100804.1-2100804.9|共9页
  • 作者

    Tokmoldin Nurlan; Vollbrecht Joachim; Hosseini Seyed Mehrdad; Sun Bowen; Perdigon-Toro Lorena; Woo Han Young; Zou Yingping; Neher Dieter; Shoaee Safa;

  • 作者单位

    Univ Potsdam Inst Phys & Astron Optoelect Disordered Semicond Karl Liebknecht Str 24-25 D-14476 Potsdam Germany;

    Univ Potsdam Inst Phys & Astron Optoelect Disordered Semicond Karl Liebknecht Str 24-25 D-14476 Potsdam Germany;

    Univ Potsdam Inst Phys & Astron Optoelect Disordered Semicond Karl Liebknecht Str 24-25 D-14476 Potsdam Germany;

    Univ Potsdam Inst Phys & Astron Optoelect Disordered Semicond Karl Liebknecht Str 24-25 D-14476 Potsdam Germany;

    Univ Potsdam Inst Phys & Astron Optoelect Disordered Semicond Karl Liebknecht Str 24-25 D-14476 Potsdam Germany|Univ Potsdam Inst Phys & Astron Phys & Optoelect Soft Matter Karl Liebknecht Str 24-25 D-14476 Potsdam Germany;

    Korea Univ Coll Sci Dept Chem 145 Anam Ro Seoul 02841 South Korea;

    Cent South Univ Coll Chem & Chem Engn Changsha 410083 Peoples R China;

    Univ Potsdam Inst Phys & Astron Phys & Optoelect Soft Matter Karl Liebknecht Str 24-25 D-14476 Potsdam Germany;

    Univ Potsdam Inst Phys & Astron Optoelect Disordered Semicond Karl Liebknecht Str 24-25 D-14476 Potsdam Germany;

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  • 正文语种 eng
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  • 关键词

    diffusion length; drift length; figure of merit; lifetime#8208; mobility product; steady#8208; state photoconductance;

    机译：扩散长度;漂移长度;优点图;寿命＆＃8208;移动产品;稳定＆＃8208;状态光电导;

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