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首页> 外文会议>Organic, Hybrid, and Perovskite Photovoltaics XVIII >Triplet energy transfer and triplet exciton recycling in singlet fission sensitized organic heterojunctions
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Triplet energy transfer and triplet exciton recycling in singlet fission sensitized organic heterojunctions

机译：单线态裂变敏化有机异质结中的三重态能量转移和三重态激子再循环

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摘要

Singlet exciton fission is a process where an excited singlet state splits into two triplets, thus leading to generation of multiple excitons per absorbed photon in organic semiconductors. Herein, we report a detailed exciton management approach for multiexciton harvesting over a broadband region of the solar spectrum in singlet fission sensitized organic photodiodes. Through systematic studies on the model cascade of pentacene/rubrene/C_(60), we found that efficient photocurrent generation from pentacene can still occur despite the presence of a > 10nm thick interlayer of rubrene in between the pentacene/C_(60) heterojunction. Our results show that thin rubrene interlayers of thickness < 5 nm are effective in maintaining the delicate balance between two free charge generation channels that progress independently via the electron and hole transfer routes. The contribution to photocurrent from pentacene despite having a reasonably thick rubrene interlayer, that too with higher triplet energy (T1=1.12 eV) than pentacene (T1= 0.86 eV), makes its operation a rather interesting result. We discuss the role of rubrene interlayer film discontinuity, triplet exciton reflection from rubrene interlayer and triplet energy transfer from rubrene to pentacene layer followed by diffusion of triplet excitons through rubrene as plausible mechanisms that would enable triplet excitons from pentacene to generate significant photocurrent in a multilayer organic heterojunction.
机译：单重态激子裂变是一个过程，其中激发的单重态分裂成两个三重态，从而导致有机半导体中每个吸收的光子产生多个激子。在这里，我们报告了单线裂变敏化有机光电二极管在太阳光谱的宽带区域上进行多激子收获的详细激子管理方法。通过对并五苯/钌/ C_（60）模型级联的系统研究，我们发现尽管在并五苯/ C_（60）异质结之间存在厚度大于10nm的红荧烯中间层，仍然可以从并五苯产生有效的光电流。我们的结果表明，厚度小于5 nm的薄的红荧烯中间层可以有效地维持两个自由电荷产生通道之间的微妙平衡，该通道通过电子和空穴传输途径独立发展。尽管具有相当厚的红荧烯中间层，但并五苯对光电流的贡献也具有比并五苯（T1 = 0.86 eV）高的三重态能量（T1 = 1.12 eV），这使其操作变得相当有趣。我们讨论了红荧烯中间膜不连续性，红荧烯中间层的三重态激子反射以及三重态能量从红荧烯到并五苯层的转移，然后三重态激子通过红荧烯扩散的作用，这是使三重态激子从并五苯生成多层光子的合理机制。有机异质结。

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  • 来源
    《Organic, Hybrid, and Perovskite Photovoltaics XVIII》|2017年|1036307.1-1036307.8|共8页
  • 会议地点 San Diego(US)
  • 作者

    Tasnuva Hamid; Soniya D. Yambem; Ross Crawford; Jonathan Roberts; Ajay K. Pandey;

  • 作者单位

    School of Electrical Engineering and Computer Science, Science and Engineering Faculty, Queensland University of Technology (QUT), Brisbane, QLD, Australia, 4000;

    School of Chemistry Physics and Mechanical Engineering, Queensland University of Technology (QUT), Brisbane, QLD, Australia, 4000,Institute of Health and Biomedical Innovation, Queensland University of Technology (QUT), Kelvin Grove, QLD, Australia, 4053;

    School of Chemistry Physics and Mechanical Engineering, Queensland University of Technology (QUT), Brisbane, QLD, Australia, 4000,Institute of Health and Biomedical Innovation, Queensland University of Technology (QUT), Kelvin Grove, QLD, Australia, 4053;

    School of Electrical Engineering and Computer Science, Science and Engineering Faculty, Queensland University of Technology (QUT), Brisbane, QLD, Australia, 4000,Institute of Health and Biomedical Innovation, Queensland University of Technology (QUT), Kelvin Grove, QLD, Australia, 4053;

    School of Electrical Engineering and Computer Science, Science and Engineering Faculty, Queensland University of Technology (QUT), Brisbane, QLD, Australia, 4000,Institute of Health and Biomedical Innovation, Queensland University of Technology (QUT), Kelvin Grove, QLD, Australia, 4053;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    singlet fission; triplet excitons; triplet energy transfer; pentacene; rubrene; C_(60); organic heterojunctions; photovoltaics;

    机译：单重态裂变三重态激子；三重态能量转移；并五苯;红宝石C_（60）；有机异质结；光伏;

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