Despite the impressive progress that has been achieved for organic solar cells (OSCs) in recent years, challenges remain for OSCs due to the presence of the trade‐off between photovoltage and photocurrent that sets limitation on the performance enhancement of regular bulk heterojunction (BHJ) blends. Herein, a new small‐molecule (SM) donor, BPR‐SCl, with the deep‐lying highest occupied molecular orbital and strong crystallinity has been developed, which, as the third component, is synergized with PM6:Y6 host blend. The introduction of BPR‐SCl enhances molecular packing, exciton dissociation, as well as charge mobilities of ternary blends, yielding simultaneous enhancement of open‐circuit voltage, short‐circuit current density, and fill factor of ternary OSCs (TOSCs). As a result, an optimal power conversion efficiency (PCE) of 16.74% is obtained for TOSCs with 25 wt% BPR‐SCl, accounting for 10% and 70% improvements over those of pristine PM6:Y6 and BPR‐SCl:Y6 binary devices, respectively. Overall, herein, it is demonstrated that the design of SM donor as the third component is effective in achieving high‐performance TOSCs.

中文翻译：

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基于协同高分子和小分子供体的高效三元有机太阳能电池

尽管近年来有机太阳能电池（OSC）取得了令人瞩目的进步，但由于光电压和光电流之间存在折衷，这限制了常规本体异质结（BHJ）的性能提升，因此OSC仍然面临挑战。混合。在此，已开发出一种新的小分子（SM）供体BPR-SCl，它具有最深的最高分子占据轨道和强结晶性，并且作为第三组分与PM6：Y6主体混合物协同作用。BPR-SCl的引入增强了三元混合物的分子堆积，激子解离和电荷迁移率，同时增强了三元OSC（TOSC）的开路电压，短路电流密度和填充系数。结果，最佳功率转换效率（PCE）为16。对于含25 wt％BPR-SCl的TOSC，获得74％，分别比原始PM6：Y6和BPR-SCl：Y6二元装置提高了10％和70％。总体而言，本文证明了SM供体作为第三部分的设计可有效实现高性能TOSC。