厦门大学学报（自然科学版）2025，Vol.64Issue(5)：790-797,885,9.DOI:10.6043/j.issn.0438-0479.202402013
基于吲哚二噻吩并吡咯的小分子给体材料的合成及其光伏性能
Synthesis and photovoltaic performance of small-molecule donor materials based on indolodithienopyrrole
摘要
Abstract
[Objective]Design and synthesis of novel high-performance small-molecule donor materials is the most effective way to improve the photovoltaic performance of vacuum-deposited all-small-molecule organic solar cells(ASM-OSCs).Herein,two novel small molecules,M 1 and M2,with indolodithienopyrrole as the electron-donating unit,3-(dicyanomethylidene)indan-1-one as the electron-withdrawing unit,and thiophene or furan as the π bridge,were synthesized as donor materials for vacuum-deposited ASM-OSCs.[Methods]Vacuum-deposited ASM-OSCs with the device structure of indium tin oxide(ITO)/MoO3/donor∶C70/bathocuproine(BCP)/Ag were fabricated.The ITO glass substrates were cleaned in organic solvents and treated in UV-ozone ambient for 10 min prior to thin film deposition.The organic and metal oxide thin films as well as metal electrodes were deposited on the ITO substrates in a high-vacuum chamber with a base pressure of 2.0×10-5Pa.A 10 nm thick MoO3 was deposited on the ITO substrates at a rate of 0.02 nm/s.Mixed active layers(80 nm)consisting of donors∶C70 were then prepared via co-deposition from two sources at a total rate of 0.1 nm/s.A 5 nm thick BCP was deposited at a rate of 0.01 nm/s,followed by thermal evaporation of a 100 nm thick Ag at a rate of 0.1 nm/s to complete the device.[Results]Two novel small-molecule donors Ml and M2 based on indolodithienopyrrole were synthesized.Single crystal X-ray diffraction analysis,UV-Vis spectrometry,and cyclic voltammetry measurements reveal that the small-molecule donor M2 with furan π bridge showed improved molecular coplanarity,lower highest occupied molecular orbit(HOMO)energy levels(-5.14 eV),and stronger intermolecular π-π interactions(with aπ-πinteraction distance of 3.44 Å)than those of M1 with thiophene π bridge.Consequently,M2-based devices exhibited a higher power conversion efficiency(PCE)of 3.43％with enhanced open-circuit voltage(Voc),short-circuit current density(Jsc),and fill factor(FF)than those of M1-based devices.Moreover,both M1 and M2-based devices demonstrated excellent storage and thermal stability.[Conclusion]The small-molecule donor M2 with furan π bridge had better molecular coplanarity,lower HOMO energy levels,stronger intermolecular π-π interactions and better photovoltaic performance than those of M 1 with thiophene π bridge.This work offers valuable insights for the molecular design of small-molecule donor materials for vacuum-deposited ASM-OSCs.关键词
有机太阳能电池/小分子给体/吲哚二噻吩并吡咯/光伏性能Key words
organic solar cell/small-molecule donor/indolodithienopyrrole/photovoltaic performance分类
化学化工引用本文复制引用
曹琨,陈斌文,杨可玥,戴乐山,邓林龙,谢素原,郑兰荪..基于吲哚二噻吩并吡咯的小分子给体材料的合成及其光伏性能[J].厦门大学学报（自然科学版）,2025,64(5):790-797,885,9.基金项目
国家自然科学基金(92061122,92061204) （92061122,92061204）
