物理化学学报2025，Vol.41Issue(3)：104-112,9.DOI:10.3866/PKU.WHXB202406007
氰基修饰的苝二酰亚胺衍生物作为膜厚不敏感型阴极界面材料用于高效有机太阳能电池
Thickness-lnsensitive,Cyano-Modified Perylene Diimide Derivative as a Cathode lnterlayer Material for High-Efficiency Organic Solar Cells
摘要
Abstract
Interlayer materials play a crucial role in achieving high efficiency in organic solar cells(OSCs).However,slight increases in film thickness often lead to significant charge accumulation and recombination,presenting a challenge for large-scale OSC device fabrication.Therefore,there is a pressing need for interlayer materials that are insensitive to variations in thickness.In this study,we synthesized a cost-effective cyano-modified perylene diimide(PDI)derivative,PDlNBrCN,as an interlayer material.Compared to the analogous PDlNBr,the introduction of cyano groups lowers the lowest unoccupied molecular orbital(LUMO)energy level of the molecule,enhancing electron injection and charge transport efficiency.Additionally,PDlNBrCN demonstrates excellent solubility in 2,2,2-trifluoroethanol(TFE)and effectively modifies the electrode work function,facilitating device fabrication through orthogonal solvent processing.When utilized as the cathode interlayer in D18:L8-BO devices,PDlNBrCN achieved a high power conversion efficiency(PCE)of 18.83%with a film thickness of 10 nm.Importantly,PDlNBrCN maintained a PCE of 17.90%even when the film thickness was increased to 50 nm.In contrast,the analogous PDI derivatives PDlNBr and the star cathode interlayer material anthra[2,1,9-def:6,5,10-d'e'f']diisoquinoline-1,3,8,10(2H,9H)-tetrone(PDINN)achieved PCEs of 17.17%and 17.06%,respectively,at the same film thickness.Notably,PDlNBrCN maintained a PCE of over 16%even with an interlayer thickness of 80 nm,marking one of the best results for small molecule PDI derivatives as cathode interlayer materials at this thickness.Our findings demonstrate that PDlNBrCN exhibits excellent processability,electrode work function adjustment capability,and crucially,thickness-insensitive properties.Therefore,PDlNBrCN holds promise as an efficient and cost-effective cathode interlayer material,with potential for future commercial applications in OSCs.关键词
阴极界面层材料/有机太阳能电池/光电转换效率/膜厚不敏感性/氰基Key words
Cathode interlayer material/Organic solar cell/Power conversion efficiency/Thickness-insensitive property/Cyano group分类
化学引用本文复制引用
王毅锴,薄志山,蒋晓林,宋浩鸣,魏楠,王逸凡,徐新军,李翠红,路皓,刘亚辉..氰基修饰的苝二酰亚胺衍生物作为膜厚不敏感型阴极界面材料用于高效有机太阳能电池[J].物理化学学报,2025,41(3):104-112,9.基金项目
The project was supported by the National Natural Science Foundation of China(22375024,21975031,51933001,and 21734009). 国家自然科学基金(22375024,21975031,51933001,21734009)资助项目 （22375024,21975031,51933001,and 21734009）
