Yu Runnan, Yao Huifeng, Cui Yong, Hong Ling, He Chang, Hou Jianhui
State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences (BNLMS), Beijing, 100190, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Adv Mater. 2019 Sep;31(36):e1902302. doi: 10.1002/adma.201902302. Epub 2019 Jul 11.
Recent advances in the material design and synthesis of nonfullerene acceptors (NFAs) have revealed a new landscape for polymer solar cells (PSCs) and have boosted the power conversion efficiencies (PCEs) to over 15%. Further improvements of the photovoltaic performance are a significant challenge in NFA-PSCs based on binary donor:acceptor blends. In this study, ternary PSCs are fabricated by incorporating a fullerene derivative, PC BM, into a combination of a polymer donor (PBDB-TF) and a fused-ring NFA (Y6) and a very high PCE of 16.5% (certified as 16.2%) is recorded. Detailed studies suggest that the loading of PC BM into the PBDB-TF:Y6 blend can not only enhance the electron mobility but also can increase the electroluminescence quantum efficiency, leading to balanced charge transport and reduced nonradiative energy losses simultaneously. This work suggests that utilizing the complementary advantages of fullerene and NFAs is a promising way to finely tune the detailed photovoltaic parameters and further improve the PCEs of PSCs.
非富勒烯受体（NFAs）材料设计与合成方面的最新进展为聚合物太阳能电池（PSCs）展现了新前景，并将功率转换效率（PCEs）提高到了15%以上。在基于二元供体：受体共混物的NFA-PSCs中，进一步提高光伏性能是一项重大挑战。在本研究中，通过将富勒烯衍生物PC BM掺入聚合物供体（PBDB-TF）和稠环NFA（Y6）的组合中来制备三元PSCs，并记录到了16.5%（认证为16.2%）的非常高的PCE。详细研究表明，将PC BM负载到PBDB-TF:Y6共混物中不仅可以提高电子迁移率，还可以提高电致发光量子效率，从而同时实现平衡的电荷传输并减少非辐射能量损失。这项工作表明，利用富勒烯和NFAs的互补优势是微调详细光伏参数并进一步提高PSCs的PCEs的一种有前景的方法。
