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, Wai Kwok Wong, Xunjin Zhu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

50 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 and Interfaces
Volume8
Issue number44
DOIs
Publication statusPublished - 9 Nov 2016

Keywords

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

ASJC Scopus subject areas

  • Materials Science(all)

Cite this