Deep Energetic Trap States in Organic Photovoltaic Devices
Deep Energetic Trap States in Organic Photovoltaic Devices
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DOI：
10.1002/aenm.201100541
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发表时间：
2012
影响因子：
27.8
通讯作者：
C. Shuttle;N. Treat;J. D. Douglas;J. Fréchet;M. Chabinyc
中科院分区：
文献类型：
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作者：
C. Shuttle;N. Treat;J. D. Douglas;J. Fréchet;M. Chabinyc
人们对有机半导体中能量无序的本质知之甚少。在光伏技术中，能量无序导致开路电压降低，并导致其他损耗过程。在这项工作中，三种独立的光电方法被用来测定高效N-烷基硫代[3，4-c]吡咯-4，6-二酮(TPD)聚合物：富勒烯太阳能电池中的长寿命载流子布居。在TPD共聚物中，所有方法都表明∼1015 cm−3在时间尺度≥100μS上存在长寿命载流子布居。此外，这些光伏器件在光偏压下的行为与深能量躺陷态是一致的。对高效聚-3-己基噻吩富勒烯太阳能电池也进行了对比测量，但没有观察到类似的长寿命载流子群。这一观察结果与P3HT中比TPD基共聚物中更高的受主浓度(掺杂)是一致的。
The nature of energetic disorder in organic semiconductors is poorly understood. In photovoltaics, energetic disorder leads to reductions in the open circuit voltage and contributes to other loss processes. In this work, three independent optoelectronic methods were used to determine the long‐lived carrier populations in a high efficiency N‐alkylthieno[3,4‐c]pyrrole‐4,6‐dione (TPD) based polymer: fullerene solar cell. In the TPD co‐polymer, all methods indicate the presence of a long‐lived carrier population of ∼ 1015 cm−3 on timescales ≥ 100 μs. Additionally, the behavior of these photovoltaic devices under optical bias is consistent with deep energetic lying trap states. Comparative measurements were also performed on high efficiency poly‐3‐hexylthiophene (P3HT): fullerene solar cells; however a similar long‐lived carrier population was not observed. This observation is consistent with a higher acceptor concentration (doping) in P3HT than in the TPD‐based copolymer.