摘要
近年来,由于新型、高效高分子给体和非富勒烯受体的不断涌现,有机太阳电池性能得以快速提高.本文开发了基于稠环双内酯构筑单元的高分子给体材料,设计合成了两种五元稠环双内酯单元BL1和BL2,并进一步用这两种单元构筑了D-A共轭高分子给体P1和P2.BL1和BL2的分子结构通过X射线单晶衍射方法得到解析.BL1呈现完全平面化的分子结构,BL2则由于分子中两个相邻羰基的排斥作用而呈现一种扭曲平面结构.由于双内酯基团的强吸电子性以及BL1和BL2单元较大的稠环平面,高分子给体P1和P2展现出较深的HOMO能级和较好的空穴迁移率.基于上述高分子给体和非富勒烯受体IT-4F的太阳电池P1:IT-4F和P2:IT-4F实现了较高的开路电压,分别为0.96和0.94 V,能量转换效率分别为10.44%和7.31%.
The past 5 years have witnessed the rapid development of organic solar cells based on nonfullerene acceptors(NFAs)[1-26].The state-of-the-art NFA-based single-junction and tandem solar cells afforded 18.22%(certified 17.6%)and 17.36%(certified 17.29%)power conversion efficiencies(PCEs),respectively[27,28].Wide-bandgap(WBG)polymer donors are ideal partners for NFAs.They present complementary absorption with that of low-bandgap NFAs and deep the highest occupied molecular orbital(HOMO)levels.Therefore,solar cells based on a WBG polymer and a NFA can generate high short-circuit current density(Jsc)and open-circuit voltage(Voc)[29].Meanwhile,some WBG polymers show high crystallinity and mobility,gifting the solar cells high fill factors(FF)[30].Recently,our group first reported efficient WBG D-A copolymer donors based on fused-ring aromatic lactone(FRAL)acceptor units.
作者
熊骥
许金桂
江宇凡
肖作
保秦烨
郝锋
冯亚青
张斌
靳志文
丁黎明
Ji Xiong;Jingui Xu;Yufan Jiang;Zuo Xiao;Qinye Bao;Feng Hao;Yaqing Feng;Bin Zhang;Zhiwen Jin;Liming Ding(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China;Center for Excellence in Nanoscience(CAS),Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS),National Center for Nanoscience and Technology,Beijing 100190,China;School of Materials Science and Engineering,Changzhou University,Changzhou 213164,China;Key Laboratory of Polar Materials and Devices(MOE),School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China;School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 611731,China;School of Physical Science and Technology,Lanzhou University,Lanzhou 730000,China)
基金
the National Key Research and Development Program of China(2017YFA0206600)
the National Natural Science Foundation of China(51773045,21772030,51922032 and 21961160720)
the Youth Association for Promoting Innovation(CAS)for financial support。
