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arXiv 2201.11626cond-mat.mtrl-sci
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有机太阳能电池中非富勒烯受体的化学设计规则

Chemical design rules for non-fullerene acceptors in organic solar cells

A. Markina, K. -H. Lin, W. Liu, C. Poelking, Y. Firdaus, D. R. Villalva, J. I. Khan, S. H. K. Paleti, G. T. Harrison, J. Gorenflot, W. Zhang, S. De Wolf, I. McC… 展开作者

A. Markina, K. -H. Lin, W. Liu, C. Poelking, Y. Firdaus, D. R. Villalva, J. I. Khan, S. H. K. Paleti, G. T. Harrison, J. Gorenflot, W. Zhang, S. De Wolf, I. McCulloch, T. D. Anthopoulos, D. Baran, F. Laquai, D. Andrienko

摘要:

自从非富勒烯受体(NFA)的开发以来,有机太阳能电池的效率几乎翻了一番。然而,仍然需要供体-NFA组合的通用化学设计规则。这些规则是通过分析施主-受主界面处的不均匀静电场而提出的。结果表明,受体-供体-受体分子结构,和平行于界面的分子排列,导致能级弯曲,使电荷转移态不稳定,从而促进其解离成自由电荷。通过分析一系列的PCE 10:NFA太阳能电池,与NFA包括Y 6,IEICO,和ITIC,以及它们的卤化衍生物,它表明,约75德拜A的分子四极矩平衡的损失,在开路电压和电荷产生效率的增益。

英文摘要:

Efficiencies of organic solar cells have practically doubled since the development of non-fullerene acceptors (NFAs). However, generic chemical design rules for donor-NFA combinations are still needed. Such rules are proposed by analyzing inhomogeneous electrostatic fields at the donor-acceptor interface. It is shown that an acceptor-donor-acceptor molecular architecture, and molecular alignment parallel to the interface, results in energy level bending that destabilizes the charge transfer state, thus promoting its dissociation into free charges. By analyzing a series of PCE10:NFA solar cells, with NFAs including Y6, IEICO, and ITIC, as well as their halogenated derivatives, it is suggested that the molecular quadrupole moment of ca 75 Debye A balances the losses in the open circuit voltage and gains in charge generation efficiency.

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