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首页> 外文期刊>Advanced energy materials >Two Channels of Charge Generation in Perylene Monoimide Solid-State Dye-Sensitized Solar Cells
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Two Channels of Charge Generation in Perylene Monoimide Solid-State Dye-Sensitized Solar Cells

机译：Per单酰亚胺固态染料敏化太阳能电池中的两个电荷产生通道

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摘要

The mechanism of charge generation in solid-state dye-sensitized solar cells using triarylamine-substituted perylene monoimide dyes is studied by vis-NIR broadband pump-probe transient absorption spectroscopy. The experiments demonstrate that photoinduced electron injection into the TiO2 can only occur in regions where Li+, from the commonly used Li-TFSI additive salt, is present on the TiO2 surface. Incomplete surface coverage by Li+ means that some dye excitons cannot inject their electron into the TiO2. However it is observed in the solar cell structure that some of the dye excitons that cannot directly inject an electron still contribute to free charge generation by the previously hypothesized reductive quenching mechanism (hole transfer to the solid-state hole transporter followed by electron injection from the dye anion into the TiO2). The contribution of reductive quenching to the quantum efficiency of charge generation is significant, raising it from 68% to over 80%. Optimization of this reductive quenching pathway could be exploited to maintain high quantum efficiency in dyes with greater NIR absorption to achieve overall enhancements in device performance. It is demonstrated that broadband NIR transient spectroscopy is necessary to obtain population kinetics in these systems, as strong Stark effects distort the population kinetics in the visible region.
机译：通过vis-NIR宽带泵浦探针瞬态吸收光谱研究了使用三芳基胺取代的per单酰亚胺染料的固态染料敏化太阳能电池中电荷产生的机理。实验表明，光诱导电子注入TiO2只能发生在通常使用的Li-TFSI添加剂盐中的Li +存在于TiO2表面的区域。 Li +的不完全表面覆盖意味着某些染料激子无法将其电子注入TiO2中。但是，在太阳能电池结构中观察到，某些不能直接注入电子的染料激子仍然可以通过先前假定的还原性淬灭机理（空穴转移到固态空穴传输器，然后从电子注入）来促进自由电荷的产生。染料阴离子进入TiO2）。还原淬灭对电荷产生的量子效率的贡献是巨大的，将其从68％提高到80％以上。可以利用这种还原淬灭途径的优化来保持染料具有较高的NIR吸收的高量子效率，从而实现器件性能的整体提高。事实证明，宽带NIR瞬态光谱法对于在这些系统中获得种群动力学是必不可少的，因为强烈的Stark效应会扭曲可见区域中的种群动力学。

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  • 来源
    《Advanced energy materials》 |2014年第2期|1-9|共9页
  • 作者

    Ian A. Howard; Michael Meister; BjÖrn Baumeier; Henrike Wonneberger; Neil Pschirer; RÜdiger Sens; Ingmar Bruder; Chen Li; Klaus MÜllen; Denis Andrienko; FrÉdÉric Laquai;

  • 作者单位

    Max Planck Research Group for Organic Optoelectronics Synthetic Chemistry Group Polymer Theory Group Max Planck Institute for Polymer Research Mainz Germany;

    Max Planck Research Group for Organic Optoelectronics Synthetic Chemistry Group Polymer Theory Group Max Planck Institute for Polymer Research Mainz Germany;

    Polymer Theory Group Max Planck Institute for Polymer Research Mainz Germany;

    BASF SE Ludwigshafen Germany;

    BASF SE Ludwigshafen Germany;

    BASF SE Ludwigshafen Germany;

    BASF SE Ludwigshafen Germany;

    Synthetic Chemistry Group Polymer Theory Group Max Planck Institute for Polymer Research Mainz Germany;

    Synthetic Chemistry Group Polymer Theory Group Max Planck Institute for Polymer Research Mainz Germany;

    Polymer Theory Group Max Planck Institute for Polymer Research Mainz Germany;

    Max Planck Research Group for Organic Optoelectronics Synthetic Chemistry Group Polymer Theory Group Max Planck Institute for Polymer Research Mainz Germany;

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  • 正文语种 eng
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  • 关键词

    solar cells; electronic structures; electronic processes; photochemistry; titanium dioxide;

    机译：太阳能电池;电子结构;电子工艺;光化学;二氧化钛;

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