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首页> 外文期刊>Advanced Functional Materials >Comparison of the Operation of Polymer/Fullerene, Polymer/Polymer, and Polymer/Nanocrystal Solar Cells: A Transient Photocurrent and Photovoltage Study
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Comparison of the Operation of Polymer/Fullerene, Polymer/Polymer, and Polymer/Nanocrystal Solar Cells: A Transient Photocurrent and Photovoltage Study

机译：聚合物/富勒烯，聚合物/聚合物和聚合物/纳米晶体太阳能电池的操作比较：瞬态光电流和光电压研究

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摘要

We utilize transient techniques to directly compare the operation of polymer/ fullerene, polymeranocrystal, and polymer/polymer bulk heterojunction solar cells. For all devices, poly(3-hexylthiophene) (P3HT) is used as the electron donating polymer, in combination with either the fullerene derivative phenyl-C_(61) -butyric acid methyl ester (PCBM) in polymer/fullerene cells, CdSe nanoparticles in polymeranocrystal cells, or the polyfluorene copolymer poly((9,9-dioctylfluorene)-2,7-diyl-alt-[4,7-bis(3-hexylthien-5-yl)-2,l,3-benzothiadiazole]-2,2-diyl) (F8TBT) in polymer/polymer cells. Transient photocurrent and photovoltage measurements are used to probe the dynamics of charge-separated carriers, with vastly different dynamic behavior observed for polymer/fullerene, polymer/polymer, and polymeranocrystal devices on the microsecond to millisecond timescale. Furthermore, by employing transient photocurrent analysis with different applied voltages we are also able to probe the dynamics behavior of these cells from short circuit to open circuit. P3HT/F8TBT and P3HT/CdSe devices are characterized by poor charge extraction of the long-lived carriers attributed to charge trapping. P3HT/PCBM devices, in contrast, show relatively trap-free operation with the variation in the photocurrent decay kinetics with applied bias at low intensity, consistent with the drift of free charges under a uniform electric field. Under solar conditions at the maximum power point, we see direct evidence of bimolecular recombination in the P3HT/PCBM device competing with charge extraction. Transient photovoltage measurements reveal that, at open circuit, photogenerated charges have similar lifetimes in all device types, and hence, the extraction of these long-lived charges is a limiting process in polymer/ nanocrystal and polymer/polymer devices.
机译：我们利用瞬态技术直接比较聚合物/富勒烯，聚合物/纳米晶体和聚合物/聚合物本体异质结太阳能电池的运行情况。对于所有器件，聚（3-己基噻吩）（P3HT）用作电子给体聚合物，并与聚合物/富勒烯电池中的富勒烯衍生物苯基-C_（61）-丁酸甲酯（PCBM），CdSe纳米颗粒结合使用在聚合物/纳米晶体电池中，或聚芴共聚物聚（（9,9-二辛基芴）-2,7-二基-alt- [4,7-双（3-己基噻吩-5-基）-2，l，3-聚合物/聚合物电池中的苯并噻二唑] -2,2-二基）（F8TBT）。瞬态光电流和光电压测量用于探测电荷分离的载流子的动力学，在微秒至毫秒的时间尺度上观察到聚合物/富勒烯，聚合物/聚合物和聚合物/纳米晶体器件的动力学行为差异很大。此外，通过采用具有不同施加电压的瞬态光电流分析，我们还能够探究这些电池从短路到开路的动力学行为。 P3HT / F8TBT和P3HT / CdSe器件的特征在于，由于电荷俘获，对长寿命载流子的电荷提取不良。相比之下，P3HT / PCBM器件显示出相对无陷阱的操作，并且在低强度下施加偏置时光电流衰减动力学发生变化，这与均匀电场下自由电荷的漂移一致。在最大功率点的太阳能条件下，我们看到P3HT / PCBM器件中的双分子重组与电荷提取竞争的直接证据。瞬态光电压测量表明，在开路状态下，光生电荷在所有器件类型中都有相似的寿命，因此，提取这些长寿命电荷是聚合物/纳米晶体和聚合物/聚合物器件中的一个限制过程。

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  • 来源
    《Advanced Functional Materials》 |2011年第8期|p.1419-1431|共13页
  • 作者

    Zhe Li; Feng Cao; Neil C. Creenham; Christopher R. McNeill;

  • 作者单位

    Cavendish Laboratory University of Cambridge J J Thomson Ave, Cambridge, CB3 OHE, United Kingdom;

    Cavendish Laboratory University of Cambridge J J Thomson Ave, Cambridge, CB3 OHE, United Kingdom;

    Cavendish Laboratory University of Cambridge J J Thomson Ave, Cambridge, CB3 OHE, United Kingdom;

    Cavendish Laboratory University of Cambridge J J Thomson Ave, Cambridge, CB3 OHE, United Kingdom;

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