18% Efficiency organic solar cells

近年来随着非富勒烯受体材料的快速发展,有机太阳电池效率已经突破17%,同时,开发与非富勒烯受体匹配的宽带隙给体材料也成为新的研究热点.作者团队之前发展了多种基于稠环受体单元的宽带隙D-A共聚物给体材料,稠环受体单元的引入可以降低给体HOMO能级,增强分子堆积,提高空穴迁移率,因此基于这些给体的太阳电池可同时获得高的开路电压、短路电流和填充因子.本文作者采用具有大共轭平面的二噻吩并苯并噻二唑(DTBT)作为受体单元,合成了宽带隙D-A共聚物给体D18. D18与非富勒烯受体Y6共混的单结电池效率达18.22%(认证效率达17.6%),这是目前报道的有机太阳电池效率最高纪录.

In 1995,Yu et al.[1]first reported bulk-heterojunction(BHJ)solar cells with a conjugated polymer donor and a fullerene acceptor as the active materials.From then on,BHJ organic solar cells(OSCs)have attracted academic and industrial interests due to the advantages like lightweight,flexibility and roll-to-roll fabrication.Nowadays,17%power conversion efficiencies(PCEs)have been achieved in the state-of-the-art OSCs[2,3].The remarkable progress in OSCs relies on the continuously emerging new materials and device fabrication technologies,and the understanding on film morphology and device physics[4,5].