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Bulk heterojunction perovskite hybrid solar cells with large fill factor

机译：填充系数大的块状异质结钙钛矿混合太阳能电池

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摘要

A major limitation to increasing the efficiency of perovskite hybrid solar cells (pero-HSCs) is the fact that the diffusion length of the electrons is shorter than that of the holes. To facilitate the electron extraction efficiency in pero-HSCs and to make this efficiency comparable with that of the holes, we fabricated bulk heterojunction (BHJ) pero-HSCs by mixing perovskite materials with water-/alcoholsoluble fullerene derivatives. The observed enhanced short-circuit current densities (JSC) and enlarged fill factors (FF) were a result of the balance in the charge carrier extraction efficiency and the enlarged interfacial area between the perovskite materials and the fullerene derivatives. Significantly improved power conversion efficiencies were obtained for these BHJ pero-HSCs. A greater than 22% increase in power conversion efficiency was observed for the BHJ pero-HSCs compared with planar heterojunction pero-HSCs. A remarkable 86.7% FF, the highest reported value for pero-HSCs, was observed for the BHJ pero-HSCs. Our strategy of using a BHJ structure in pero-HSCs offers an efficient and simple way to further increase the performance of these devices.
机译：增加钙钛矿混合太阳能电池（pero-HSCs）效率的主要限制是电子的扩散长度比空穴的扩散长度短的事实。为了促进pero-HSC中的电子提取效率并使该效率与孔的效率相媲美，我们通过将钙钛矿材料与水/醇溶性富勒烯衍生物混合来制备本体异质结（BHJ）pero-HSC。所观察到的提高的短路电流密度（JSC）和增大的填充因子（FF）是电荷载流子提取效率与钙钛矿材料与富勒烯衍生物之间的界面面积增大之间取得平衡的结果。这些BHJ pero-HSC获得了显着改善的功率转换效率。与平面异质结pero-HSC相比，BHJ pero-HSC的功率转换效率提高了22％以上。对于BHJ pero-HSC，观察到了惊人的86.7％FF，这是pero-HSC的最高报告值。我们在pero-HSC中使用BHJ结构的策略提供了一种有效且简单的方法来进一步提高这些设备的性能。

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  • 来源
    《Energy & environmental science》 |2015年第4期|1245-1255|共11页
  • 作者

    Wang Kai; Liu Chang; Du Pengcheng; Zheng Jie; Gong Xiong;

  • 作者单位

    Univ Akron, Dept Polymer Engn, Akron, OH 44325 USA;

    Univ Akron, Dept Polymer Engn, Akron, OH 44325 USA;

    Univ Akron, Dept Polymer Engn, Akron, OH 44325 USA;

    Univ Akron, Dept Chem & Biomol Engn, Akron, OH 44325 USA;

    Univ Akron, Dept Polymer Engn, Akron, OH 44325 USA;

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