Abstract

Power conversion efficiency (PCE) of single-junction polymer solar cells (PSCs) has made a remarkable breakthrough recently. Plenty of work was reported to achieve PCEs higher than 16% derived from the PM6:Y6 binary system. To further increase the PCEs of binary OSCs incorporating small molecular acceptor (SMA) Y6, we substituted PM6 with PM7 due to the deeper highest occupied molecular orbital (HOMO) of PM7. Consequently, the PM7:Y6 has achieved PCEs as high as 17.0% by the hotcast method, due to the improved open-circuit voltage (VOC). Compared with PM6, the lower HOMO of PM7 increases the gap between E_LUMO-donor and E_{HOMO-acceptor}, which is proportional to V_OC. This research provides a high PCE for single-junction binary PSCs, which is meaningful for device fabrication related to PM7 and commercialization of PSCs.

中文翻译：

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通过氯化聚合物供体提高开路电压，使二元有机太阳能电池的效率超过17％

摘要

单结聚合物太阳能电池（PSC）的功率转换效率（PCE）最近取得了重大突破。据报道，通过PM6：Y6二元系统获得了大量工作，使PCE高于16％。为了进一步增加包含小分子受体（SMA）Y6的二元OSC的PCE，我们用PM7代替了PM6，这是因为PM7的最高占据分子轨道（HOMO）更深。因此，由于改进的开路电压（VOC），PM7：Y6通过热播方法实现了高达17.0％的PCE。与PM6相比，PM7的较低HOMO增大了E _LUMO供体与E _HOMO受体之间的间隙，该间隙与V _OC成比例。该研究为单结二进制PSC提供了较高的PCE，这对于与PM7相关的器件制造和PSC的商业化意义重大。