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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Cooperatively Tuning Phase Size and Absorption of Near IR Photons in P3HT:Perylene Diimide Solar Cells by Bay-Modifications on the Acceptor
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Cooperatively Tuning Phase Size and Absorption of Near IR Photons in P3HT:Perylene Diimide Solar Cells by Bay-Modifications on the Acceptor

机译：通过受体上的海湾修饰，协同调整P3HT ::二酰亚胺太阳能电池中的近红外光子的相大小和吸收

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摘要

P3HT is a widely used and commercial polymer donor, but it cannot absorb near IR solar photons. Chemical accessibility to tune the frontier molecular orbits of π-conjugated small molecule acceptors increases the possibility to improve their near IR absorption, which is complementary to P3HT. Taking the aggregation tendency of the planar π-system into account, we herein use the traditional n-type organic semiconductor of perylene diimide (PDI) as the model backbone, showing a molecular way to cooperatively tune the aggregation tendency and absorption of the near IR photons. Practically, we replace the 2-methoxylethoxyI units from the mother PDI monomer (O- PDI-O), one-by-one, with the 4,8-bis(2-(2-ethylhexylthienyl) benzo[l,2-b':4,5-b']- dithiophene (BDT) moieties, giving two other PDI monomers of B-PDI-O and B- PDI-B. Because of the photoinduced intramolecular charge transfer transition from the BDT unit to the PDI core, B-PDI-B exhibits a broad absorption shoulder beyond 600 nm in the dilute solution, and beyond 650 nm in the solid film. This red-shifted absorption enhances usage of the near IR photons of the solar emission when using P3HT as the donor. The steric effects between the PDI and BDT planes produce twisted conformations, which effectively suppress aggregation tendency.
机译：P3HT是一种广泛使用的商用聚合物供体，但不能吸收近红外太阳光子。化学可及性调节π共轭小分子受体的前沿分子轨道增加了改善其近红外吸收的可能性，这与P3HT互补。考虑到平面π系统的聚集趋势，我们在此使用传统的im型二酰亚胺（PDI）的n型有机半导体作为模型主干，展示了一种分子方法来协同调节聚集趋势和近红外吸收光子。实际上，我们用4,8-双（2-（2-（乙基乙基己基噻吩基））苯并[1,2-b]取代了来自母体PDI单体（O-PDI-O）的2-甲氧基乙氧基I单元。 '：4,5-b']-二噻吩（BDT）部分，产生了B-PDI-O和B-PDI-B的另外两个PDI单体，因为光诱导的分子内电荷从BDT单元转移到PDI核，B-PDI-B在稀溶液中的吸收波长超过600 nm，而在固体膜中的吸收波长超过650 nm，当使用P3HT作为施主时，这种红移吸收会增强太阳辐射的近红外光子的利用PDI和BDT平面之间的空间效应会产生扭曲的构象，从而有效抑制聚集趋势。

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