Regulating the Electron-Deficient Component in A-DA1D-A Typed Small-Molecule Acceptors for High-Performance Organic Solar Cells

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外文摘要：Fine-tuning of the electron-deficient unit in A-DA1D-A typed small-molecule acceptors(SMAs)plays a crucial role in developing efficient SMAs for organic solar cells(OSCs).Here,we developed a SMA based on benzo[4,5]thieno[2,3-b]quinoxaline,designated as QW1,as well as three SMAs based on 1-methylindoline-2,3-dione,identified as QW2,QW3,and QW4.Compared with QW2,QW1 displays slightly blue-shifted absorption spectra and a lower LUMO energy level due to the stronger electron-withdrawing capability of BTQx in contrast to MDO.On the other hand,the introduction of a bromine atom in QW3 and QW4 causes a blue shift in absorp-tion and a reduction in the LUMO energy level compared to QW2.Density functional theory analysis reveals that QW1 exhibits the best molecular planarity,which endows QW1 with larger electron mobility and tighter molecular stacking.Consequently,PM6:QW1 device affords a better efficiency of 15.63％than those of the devices based on QW2(14.25％),QW3(13.21％)and QW4(15.03％).Moreover,the QW4-based device yields the highest open-circuit voltage of 0.933 V,and the PM6:L8-BO:QW4 ternary device realizes a PCE of 19.03％.Overall,our work demonstrates that regulation of electron-deficient central units is an effective strategy to improve the photovoltaic performance of the resulting A-DA1D-A SMAs.

外文关键词：

Organic solar cellsSmall-molecule acceptorElectron-deficient unitEnergy conversion efficiencyRenewable resourcesπ-π stackingGreen chemistry

作者：

Weifei Wei、Ruijie Ma、Zhanxiang Chen、Tongle Xu、Gang Li、Zhenghui Luo

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作者单位：

Shenzhen Key Laboratory of New Information Display and Storage Materials,College of Materials Science and Engineering,Shenzhen University,Shenzhen,Guangdong 518060,China

Department of Electronic and Information Engineering,Research Institute for Smart Energy(RISE),The Hong Kong Polytechnic University,Hung Hom,Kowloon,Hong Kong 999077,China

基金：

深圳市科技计划深圳市科技计划国家自然科学基金香港研究资助局项目香港研究资助局项目香港研究资助局项目RGC Senior Research Fellowship SchemeHong Kong Polytechnic University(Sir Szeyuen Chung Endowed Professorship Fund)PolyU Distinguished postdoc FellowshipPolyU Distinguished postdoc FellowshipInstrumental Analysis Center of Shenzhen University for the Analytical Support

项目编号：

ZDSYS20210623091813040RCBS20221008093225021223091191532021615221320C5037-18GSRFS2223-SS018-84801-YW4CG-SAC5

出版年：

2024

DOI：

10.1002/cjoc.202300605

中国化学(英文版)

中国化学会上海有机化学研究所

中国化学(英文版)

CSTPCD

影响因子：0.848

ISSN：1001-604X

年,卷(期)：2024.42(6)

参考文献量58