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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Influence of the fullerene LUMO level on the stability of bulk heterojunction solar cells
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Influence of the fullerene LUMO level on the stability of bulk heterojunction solar cells

机译：富勒烯Lumo水平对散装异质结太阳能电池稳定性的影响

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摘要

Poly(3-hexylthiophene) (P3HT) is combined with a series of C-60-based derivatives with LUMO energies varying between -3.53 and -3.83 eV, in order to study the influence of the fullerene LUMO level on the performance and stability of organic solar cells as well as the degradation of the photoactive materials. UV/vis measurements show that P3HT degrades more slowly in all investigated P3HT:fullerene blends compared to neat P3HT films when being irradiated in air. Accordingly, all fullerene derivatives stabilize P3HT against photo-oxidation, albeit to different extents, with the electron affinity of the fullerene determining the degree of stabilization. A fullerene LUMO level of -3.75 eV is found to cause maximum stabilization, while the degradation rate increases for higher and lower values. Remarkably, the higher the stabilization effect imposed by the fullerene the slower the fullerene degrades itself, which indicates a non-sacrificial mode of stabilization. Transient absorption spectroscopy measurements show similar kinetics of exciton quenching and charge generation for all P3HT:fullerene combinations indicating a similar morphology in all blend films. Inverted solar cells made from the different P3HT:fullerene blends exhibit a good correlation between fullerene LUMO level and open-circuit voltage. Upon illumination in air, the photovoltaic devices follow the same degradation trend as the isolated photoactive layers by showing the same dependence on the fullerene LUMO level. Finally, we discuss different mechanisms, by which fullerene acceptors are potentially able to stabilize (UV light screening, excited-state quenching, and radical scavenging) as well as destabilize (morphological effects, superoxide or singlet oxygen sensitization, and polymer triplet-state population) donor polymers.
机译：聚（3-己基噻吩）（P3HT）与一系列LUMO能量在-3.53和-3.83 eV之间的C-60基衍生物结合，以研究富勒烯LUMO水平对有机太阳能电池性能和稳定性以及光活性材料降解的影响。紫外/可见光谱测量表明，在所有研究的P3HT：富勒烯共混物中，当在空气中辐照时，P3HT的降解速度比纯P3HT薄膜慢。因此，所有富勒烯衍生物都能稳定P3HT，防止光氧化，尽管程度不同，富勒烯的电子亲和力决定了稳定程度。发现-3.75 eV的富勒烯LUMO水平会导致最大的稳定性，而降解率随着值的升高和降低而增加。值得注意的是，富勒烯施加的稳定效应越高，富勒烯自身降解越慢，这表明稳定的非牺牲模式。瞬态吸收光谱测量显示，所有P3HT：富勒烯组合的激子猝灭和电荷生成动力学相似，表明所有共混膜的形态相似。由不同的P3HT：富勒烯混合物制成的倒置太阳能电池在富勒烯LUMO水平和开路电压之间表现出良好的相关性。在空气中照明时，光伏器件与隔离的光活性层表现出相同的退化趋势，表现出对富勒烯LUMO水平的相同依赖性。最后，我们讨论了富勒烯受体可能稳定（紫外线屏蔽、激发态猝灭和自由基清除）和不稳定（形态效应、超氧物或单线态氧敏化以及聚合物三重态布居）供体聚合物的不同机制。

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