Impact of π-spacers of dithieno[3,2-f:2′,3′-h]quinoxaline-based organic dyes with three π-spacers on the solar cell performance

  • Tai Xiao
  • Zu-Sheng HuangEmail author
  • Lingyun Wang
  • Derong CaoEmail author


Three novel dithieno[3,2-f:2′,3′-h]quinoxaline-based organic dyes (IQ-C, IQ-D and IQ-F) with three π-spacers were synthesized and developed for dye sensitized solar cells, where dithieno[3,2-f:2′,3′-h]quinoxaline was used as electron-withdrawing π-spacers, and 2,3-diphenylquinoxaline or dibenzo[a,c]phenazine as auxiliary electron-withdrawing π-spacers. The dye IQ-D with 2,3-diphenylquinoxaline as auxiliary electron-withdrawing π-spacer exhibited higher photocurrent (Jsc) and photovoltage (Voc) than that of the dye IQ-C with 2,3-bis(4-(octyloxy)phenyl)quinoxaline as the additional electron-withdrawing π-spacer, due to the larger adsorption amount of IQ-D. The dye IQ-F with a rigid conjugated dibenzo[a,c]phenazine as additional electron-withdrawing π-spacer showed the highest efficiency of 6.54% under AM 1.5 G irradiation. It was demonstrated that the π-spacers influence the photovoltaic performance of the dithieno[3,2-f:2′,3′-h]quinoxaline-based organic dyes significantly. The results indicated that the dyes with three π-spacers are promising candidates for efficient dye-sensitized solar cells.



We are grateful to the National Natural Science Foundation of China (21772045, 21572069, 21702147), the National Key Research Development Program of China (2016YFA0602900) and the Fund from the Guangzhou Science and Technology Project, China (201607010265).


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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Chemistry and Chemical Engineering, State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhouPeople’s Republic of China
  2. 2.School of Pharmaceutical SciencesWenzhou Medical UniversityWenzhouPeople’s Republic of China

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