In this work, we used a ternary blend strategy to improve the photovoltaic performance of organic solar cells (OSCs). PBDB-T:IDT-EDOT-based binary blend devices show a power conversion efficiency (PCE) of 9.93%, and the ternary devices with PC₇₁BM as the third component exhibit a PCE of 12.07% with simultaneously enhanced V_oc, J_sc and FF. The broadened absorption, optimized morphology and balanced charge carrier mobility of these devices are responsible for these improvements. The introduction of PC₇₁BM can disperse the IDT-EDOT aggregates, enhance the phase purity, and increase the electroluminescence quantum efficiency (EQE_EL). Furthermore, the performance of the ternary devices is not very sensitive to the weight ratio of the two acceptors. PCEs of over 11% are obtained even though the composition gradually varies from 1 : 1 : 0.2 to 1 : 0.4 : 0.8. Our results demonstrate that PC₇₁BM is a highly promising second acceptor for the construction of high-efficiency ternary OSCs.

中文翻译：

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高效三元非富勒烯聚合物太阳能电池，具有更高的相纯度和更低的非辐射能量损耗†

在这项工作中，我们使用了三元混合策略来改善有机太阳能电池（OSC）的光伏性能。基于PBDB-T：IDT-EDOT的二进制混合设备显示了9.93％的功率转换效率（PCE），而以PC ₇₁ BM为第三成分的三元设备显示了12.07％的PCE，同时V _oc，J _sc均得到增强和FF。这些设备的宽吸收，优化形态和平衡的载流子迁移率是这些改进的原因。PC ₇₁ BM的引入可以分散IDT-EDOT聚集体，提高相纯度，并提高电致发光量子效率（EQE _EL）。此外，三元装置的性能对两个受体的重量比不是很敏感。即使组成从1：1：0.2到1：1：0.4：0.8逐渐变化，也可以获得超过11％的PCE。我们的结果表明，PC ₇₁ BM是构建高效三元OSC的高度有前途的第二受体。