High-Efficiency Ternary Organic Solar Cells Based on the Synergized Polymeric and Small-Molecule Donors
High-Efficiency Ternary Organic Solar Cells Based on the Synergized Polymeric and Small-Molecule Donors
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基于协同聚合物和小分子供体的高效三元有机太阳能电池
DOI：
10.1002/solr.202000537
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发表时间：
2020
期刊：
影响因子：
7.9
通讯作者：
Li Chang-Zhi
中科院分区：
文献类型：
--
作者：
Chen Xianjie;Zhang Qian;Wang Di;Xu Xin;Wang Zukun;Li Yuhao;Zhu Haiming;Lu Xinhui;Chen Wanzhi;Qiu Huayu;Li Chang-Zhi
尽管近年来有机太阳能电池（OSC）取得了令人印象深刻的进展，但由于光电压和光电流之间存在的权衡，OSC仍然面临挑战，这限制了常规本体异质结（BHJ）共混物的性能增强。在此，开发了一种新的小分子（SM）供体，BPR-SCl，其具有最高占据分子轨道和强结晶性，作为第三组分，其与PM 6：Y 6主体共混物协同作用。BPR-SCl的引入增强了三元共混物的分子堆积、激子解离以及电荷迁移率，从而同时增强了三元OSC（TOSC）的开路电压、短路电流密度和填充因子。结果，对于具有25 wt% BPR-SCl的TOSC获得了16.74%的最佳功率转换效率（PCE），分别比原始PM 6：Y 6和BPR-SCl：Y 6二元器件的那些提高了10%和70%。总之，本文证明了SM供体作为第三组分的设计在实现高性能TOSC中是有效的。
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.