Recent studies demonstrated that with proper selection of chemically compatible constituents the open-circuit voltage (V_oc) of ternary-blend solar cells can be tuned across the composition window of the active layer. In this study, we probed the limit of the offset between the lowest unoccupied molecular orbital (LUMO) energy levels of the two acceptors in ternary blends containing one donor and two acceptors. We demonstrate, for the first time, that ternary-blend active layers with two acceptors having an energy-level difference between their LUMO levels exceeding 0.4 eV can still result in solar cells exhibiting composition-dependent open-circuit voltage (V_oc). Our results suggest strong electronic interactions between the acceptors, with the electron wave function delocalized over multiple molecules. These findings have broadened the library of possible candidates for active layers of ternary-blend solar cells with tunable V_oc and established guidelines for the design of next-generation materials for efficient performance of such devices.

中文翻译：

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具有两个能级偏移超过0.4 eV的受体的三元混合太阳能电池中有机合金的形成

最近的研究表明，与化学上相容的组分的适当选择的开路电压（V _OC三元共混物的太阳能电池的）可以在有源层的组成窗口来调谐。在这项研究中，我们探讨了在包含一个供体和两个受体的三元共混物中，两个受体的最低未占据分子轨道（LUMO）能量水平之间的偏移限度。我们首次证明，具有两个受体的三元共混活性层在其LUMO能级之间的能级差超过0.4 eV时，仍会导致太阳能电池表现出与成分有关的开路电压（V _oc）。我们的结果表明受体之间的强电子相互作用，电子波功能在多个分子上分散。这些发现拓宽了具有可调V _oc的三元混合太阳能电池有源层的候选材料库，并为设计下一代材料以提高此类器件的性能奠定了指导。