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首页> 外文期刊>Advanced Functional Materials >Energy Upconversion via Triplet Fusion in Super Yellow PPV Films Doped with Palladium Tetraphenyltetrabenzoporphyrin: a Comprehensive Investigation of Exciton Dynamics
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Energy Upconversion via Triplet Fusion in Super Yellow PPV Films Doped with Palladium Tetraphenyltetrabenzoporphyrin: a Comprehensive Investigation of Exciton Dynamics

机译：掺四苯基四苯并卟啉钯的超级黄PPV膜中通过三重态融合的能量上转换：激子动力学的全面研究

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摘要

One of the key issues concerning the development of efficient polymer solar cell technology is the lack of viable materials which absorb in the near-infrared (NIR) region. This could be resolved by up-converting energy from the NIR into visible using triplet fusion (TF) with an additional layer that is fabricated separately from the solar cell and deposited on top. Theoretically a maximum upconversion (UC) via TF efficiency of 50% could be obtained. Here, it is demonstrated that in a film of commercially available poly(para-phenylene vinylene) copolymer "super yellow" (SY) doped with 4% palladium(meso-tetraphenyl-tetrabenzoporphyrin) (PdTPBP) sensitizer, an UC efficiency of 6% can be achieved. By using femtosecond and nanosecond spectroscopies it is shown that the main UC efficiency loss mechanism is due to triplet quenching in PdTPBP aggregates. The PdTPBP intersystem crossing rate constant is determined to be 1.8 × 10~(11) s~(-1) and the triplet energy transfer rate constant from PdTPBP to SY to be TO9 s~(-1). Quenching in PdTPBP aggregates can account for a triplet concentration loss in the range of 76-99%. As such, preventing sensitizer aggregation in NIR-to-visible upconverting films is crucial and may lead to substantial increase of UC efficiencies in films.
机译：关于开发有效的聚合物太阳能电池技术的关键问题之一是缺乏在近红外（NIR）区域吸收的可行材料。这可以通过使用三重态融合（TF），以及与太阳能电池分开制造并沉积在顶部的附加层，将来自NIR的能量上转换为可见光来解决。理论上可以通过TF效率获得50％的最大上变频（UC）。在此证明，在掺有4％钯（间-四苯基-四苯并卟啉）（PdTPBP）敏化剂的市售聚（对亚苯基亚乙烯基）共聚物“超黄”（SY）的膜中，UC效率为6％。可以实现。通过使用飞秒和纳秒光谱仪，表明主要的UC效率损失机制是由于PdTPBP聚集体中的三重态猝灭。 PdTPBP系统间交叉速率常数确定为1.8×10〜（11）s〜（-1），从PdTPBP到SY的三重态能量传递速率常数确定为TO9 s〜（-1）。 PdTPBP聚集体的淬灭可导致三重态浓度损失在76-99％的范围内。这样，防止敏化剂在近红外至可见的上转换膜中聚集是至关重要的，并且可能导致膜中UC效率的大幅提高。

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  • 来源
    《Advanced Functional Materials》 |2013年第3期|384-393|共10页
  • 作者

    Vygintas Jankus; Edward W. Snedden; Daniel W. Bright; Victoria L Whittle; J. A. C. Williams; Andy Monkman;

  • 作者单位

    Physics Department University of Durham South Road, Durham, DH1 3LE, UK;

    Physics Department University of Durham South Road, Durham, DH1 3LE, UK;

    Physics Department University of Durham South Road, Durham, DH1 3LE, UK;

    Chemistry Department University of Durham South Road, Durham, DH1 3LE, UK;

    Chemistry Department University of Durham South Road, Durham, DH1 3LE, UK;

    Physics Department University of Durham South Road, Durham, DH1 3LE, UK;

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