摘要
高效且稳定的阴极界面层对于提高有机太阳能电池(OSCs)的性能起着至关重要的作用.萘甲酰亚胺分子因其化学结构简单且易于修饰而被用作OSCs阴极界面材料.由此,本研究设计合成了一种基于苯并二噻吩的萘甲酰亚胺新型共轭小分子NBDT-M,即6'-(4,8-双(5-(2-乙基己基)噻吩-2-基)苯并[1,2-b:4,5-b']二噻吩-2,6-二基)双(2-(3-(1H-咪唑-1-基)丙基)-1H-苯并异喹啉-1,3(2H)-二酮).与2,9-双(3-(1H-咪唑-1-基)丙基)蒽[2,1,9-def:6,5,10-d'e'f']二异喹啉-1,3,8,10(2H,9H)-四酮(PDI-M)相比,NBDT-M具有优异的醇溶液加工性能,高的最低未占有轨道(LUMO)能级,宽的光学带隙以及低的表面粗糙度.最终,以NBDT-M为阴极界面层的OSCs获得了18.3%的能量转换效率,高于PDI-M的16.5%.
The efficient and stable cathode interface layer plays a vital role in improving the performances of organic solar cells(OSCs).It not only facilitates efficient charge extraction and transport but also suppresses non-radiative recombination at the interface.Recently,naphthalimide has been used as a cathode interface material of OSCs because of its simple molecular structure and easy modification,which enables convenient synthesis and tunability of properties through chemical adjustments.Therefore,in this paper,a naphthalimide-based conjugated molecule incorporating a benzo[1,2-b:4,5-b']dithiophene unit was designed and synthesized,namely,6'-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b']dithiophene-2,6-diyl)bis(2-(3-(1H-imidazole-1-yl)propyl)-1H-benzo[de]isoquinoline 1,3(2H)-dione)(NBDT-M).The introduction of the benzo[1,2-b:4,5-b']dithiophene unit was intended to optimize the electronic structure and molecular packing.NBDT-M exhibits excellent film-forming ability,which is crucial for device fabrication.It also shows high thermal stability,ensuring the device remains stable during operation.The up-shifted lowest unoccupied molecular orbital(LUMO)energy level is beneficial for better energy-level alignment with the active layer.The large optical energy band gap reduces optical absorption losses,and the low surface roughness minimizes interface defects.Finally,NBDT-M modified OSCs yield a power conversion efficiency(PCE)of up to 18.3%,significantly higher than that of the PDI-M based device(16.5%).
作者
胡锦祺
姜基磊
代水星
刘昊
崔伦秀
宋蕙馨
江河清
黄明华
Jing-qi Hu;Ji-lei Jiang;Shui-xing Dai;Hao Liu;Lun-xiu Cui;Hui-xin Song;He-qing Jiang;Ming-hua Huang(School of Materials Science and Engineering,Ocean University of China,Qingdao 266100;Institute of Bioenergy and Bioprocess Technology,Chinese Academy of Sciences,Qingdao 266101)
出处
《高分子学报》
北大核心
2025年第7期1140-1149,共10页
Acta Polymerica Sinica
基金
山东省自然科学基金青年面上项目(基金号ZR2024QB022)
太阳能光电转换与利用全国重点实验室(基金号SKLPCU24OP010)资助。
作者简介
通信联系人:代水星,E-mail:sxdai@pku.edu.cn,daishuixing@ouc.edu.cn;通信联系人:江河清,jianghq@qibebt.ac.cn;通信联系人:黄明华,huangminghua@ouc.edu.cn。
