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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >On the Interface Dipole at the Pentacene-Fullerene Heterojunction: A Theoretical Study
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On the Interface Dipole at the Pentacene-Fullerene Heterojunction: A Theoretical Study

机译:并五苯-富勒烯异质结界面偶极子的理论研究

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The electronic structure at organic/organic interfaces plays a key role, among others, in defining the quantum efficiency of organics-based photovoltaic cells. Here, we perform quantum-chemical and microelectrostatic calculations on molecular aggregates of various sizes and shapes to characterize the interfacial dipole moment at pentacene/C_(60) heterojunctions. The results show that the interfacial dipole mostly originates in polarization effects due to the asymmetry in the multipolar expansion of the electronic density distribution between the interacting molecules, rather than in a charge transfer from donor to acceptor. The local dipole is found to fluctuate in sign and magnitude over the interface and appears as a sensitive probe of the relative arrangements of the pentacene and C_(60) molecules (and of the resulting local electrical fields sensed by the molecular units).
机译:在确定基于有机物的光伏电池的量子效率中,有机/有机界面处的电子结构起着关键作用。在这里,我们对各种尺寸和形状的分子聚集体进行量子化学和微静电计算,以表征并五苯/ C_(60)异质结处的界面偶极矩。结果表明,界面偶极子起因于极化效应,这是由于相互作用分子之间电子密度分布的多极膨胀不对称引起的,而不是由供体到受体的电荷转移引起的。发现局部偶极子在界面上的符号和幅度发生波动,并作为并五苯和C_(60)分子(以及分子单元感测到的局部电场)的相对排列的敏感探针出现。

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