New Terthiophene-Conjugated Porphyrin Donors for Highly Efficient Organic Solar Cells

Liangang Xiao, Song Chen, Ke Gao, Xiaobin Peng*, Feng Liu, Yong Cao, Wai Yeung WONG, Rick W K WONG, Xunjin ZHU

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

To mimic the natural photosynthetic systems utilizing chlorophylls to absorb light and store light energy, two new porphyrin-based small molecules of PTTR and PTTCNR have been developed for photovoltaic applications. The highest power conversion efficiency of 8.21% is achieved, corresponding to a short-circuit current of 14.30 mA cm-2, open-circuit voltage of 0.82 V, and fill factor of 70.01%. The excellent device performances can be ascribed to the engineering of molecule structure and film morphology. The horizontal conjugation of 3,3″-dihexyl-terthiophene to porphyrin-core with the vertical aliphatic 2-octylundecyl peripheral substitutions, can not only effectively increase the solar flux coverage between the conventional Soret and Q bands of porphyrin unit, but also optimize molecular packing through polymorphism associated with side-chains and the linear π-conjugated backbones. And the additive of 1,8-diiodooctane and subsequent chloroform solvent vapor annealing facilitate the formation of the blend films with [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) characteristics of bicontinuous, interpenetrating networks required for efficient charge separation and transportation.

Original languageEnglish
Pages (from-to)30176-30183
Number of pages8
JournalACS applied materials & interfaces
Volume8
Issue number44
DOIs
Publication statusPublished - 9 Nov 2016

Scopus Subject Areas

  • Materials Science(all)

User-Defined Keywords

  • molecular packing
  • organic solar cells
  • peripheral substitutions
  • porphyrin
  • terthiophene

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