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首页> 外文期刊>RSC Advances >The influence of hierarchical TiO2 microspheres on the trap state distribution and charge transport/recombination dynamics in quantum dot sensitized solar cells
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The influence of hierarchical TiO2 microspheres on the trap state distribution and charge transport/recombination dynamics in quantum dot sensitized solar cells

机译：分层TiO2微球对量子点敏化太阳能电池陷阱状态分布和电荷输送/重组动力学的影响

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摘要

Two different kinds of quantum dot sensitized solar cells (QDSSCs) were fabricated based on the photoanode materials P25 (Cell-P25) and hierarchical TiO2 microspheres (HMS, Cell-HMS). The trap state distributions and charge transport/recombination dynamics are comparatively investigated by means of time-resolved charge extraction and transient photovoltage measurements. The dynamics results prove that, compared to Cell-P25, Cell-HMS possesses higher density and lower trap state energy characteristics, as well as a 30% lower charge transport rate. In addition, the boundary level dividing lower-voltage iso-energetic charge recombination and higher-voltage multiple-trap limited charge recombination is experimentally determined. Furthermore, Cell-HMS is found to exhibit a slightly higher boundary voltage and a 96% lower recombination rate with respect to Cell-P25. A physical model is proposed to describe the influence of trap state distribution on charge transport/recombination, highlighting the importance of photoanode morphology in optimizing the photovoltaic performance of QDSSCs.
机译：基于光潮剂材料P25（CELL-P25）和分层TiO2微球（HMS，CELL-HMS）制造两种不同类型的量子点敏化太阳能电池（QDSSC）。通过时间分辨的电荷提取和瞬态光伏测量相比，陷阱状态分布和电荷传输/重组动力学进行了相对调查。动态结果证明，与细胞-P25相比，细胞-HMS具有较高的密度和更低的陷阱状态能量特性，以及较低的电荷传输速率。另外，实验确定边界水分划分较低电压等能量电荷重组和高压多捕集有限电荷重组。此外，发现细胞-HMS表现出略高的边界电压和相对于细胞-P25的重组率降低96％。提出了一种物理模型来描述陷阱状态分布对电荷传输/重组的影响，突出了光处理形态在优化QDSSC的光伏性能方面的重要性。

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  • 来源
    《RSC Advances》 |2015年第41期|共8页
  • 作者

    Shi Xiao-Juan; Wang Yi; Wu Dapeng; Qin Yujun; Ai Xi-Cheng; Xu Dongsheng; Zhang Jian-Ping;

  • 作者单位

    Renmin Univ China Dept Chem Beijing 100872 Peoples R China;

    Renmin Univ China Dept Chem Beijing 100872 Peoples R China;

    Peking Univ Coll Chem &

    Mol Engn Beijing 100871 Peoples R China;

    Renmin Univ China Dept Chem Beijing 100872 Peoples R China;

    Renmin Univ China Dept Chem Beijing 100872 Peoples R China;

    Peking Univ Coll Chem &

    Mol Engn Beijing 100871 Peoples R China;

    Renmin Univ China Dept Chem Beijing 100872 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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