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首页> 外文期刊>Advanced Functional Materials >Structural Origins for Tunable Open-Circuit Voltage in Ternary-Blend Organic Solar Cells
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Structural Origins for Tunable Open-Circuit Voltage in Ternary-Blend Organic Solar Cells

机译：三元混合有机太阳能电池中可调节开路电压的结构起源

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Ternary-blend bulk-heterojunction solar cells have provided a unique opportunity for tuning the open-circuit voltage (V-oc) as the effective highest occupied molecular orbital (HOMO) or lowest unoccupied molecular orbital (LUMO) energy levels shift with active-layer composition. Grazing-incidence X-ray diffraction (GIXD) measurements performed on such ternary-blend thin films reveal evidence that the two polymer donors interact intimately; their ionization potentials are thus reflections of the blend compositions. In ternary-blend thin films in which the two polymer donors do not interact physically, the polymer donors each retain their molecular electronic character; solar cells constructed with these ternary blends thus exhibit V(oc)s that are pinned to the energy level difference between the highest of the two lying HOMO and the LUMO of the electron acceptor. These observations are consistent with the organic alloy model proposed earlier. Quantification of the square of the square-root differences of the surface energies of the components provides a proxy for the Flory-Huggins interaction parameter for polymer donor pairs in these ternary-blend systems. Of the three ternary-blend systems examined herein, this quantity has to be below 0.094 in order for ternary-blend solar cells to exhibit tunable V-oc.
机译：三元共混体异质结太阳能电池为调节开路电压（V-oc）提供了独特的机会，因为有效最高占据分子轨道（HOMO）或最低未占据分子轨道（LUMO）的能级随活性层而变化组成。在这种三元共混薄膜上进行的掠入射X射线衍射（GIXD）测量揭示了两个聚合物供体紧密相互作用的证据。因此它们的电离势是共混物组合物的反映。在其中两个聚合物供体不物理相互作用的三元共混薄膜中，聚合物供体各自保留其分子电子特性；因此，用这些三元混合物构成的太阳能电池表现出的V（oc）固定在两个说谎的HOMO的最高者和电子受体的LUMO之间的能级差。这些观察结果与先前提出的有机合金模型相一致。组分表面能的平方根差平方的量化为这些三元共混体系中聚合物供体对的Flory-Huggins相互作用参数提供了一个替代。在本文研究的三个三元共混体系中，该量必须低于0.094，以使三元共混太阳能电池表现出可调的V-oc。

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