Marked alkyl- Vs alkenyl-substitutent effects on squaraine dye solid-state structure, carrier mobility, and bulk-heterojunction solar cell efficiency

Diego Bagnis, Luca Beverina, Hui Huang, Fabio Silvestri, Yan Yao, Henry Yan, Giorgio A. Pagani, Tobin J. Marks, Antonio Facchetti

Research output: Contribution to journalArticle

174 Citations (Scopus)


(Figure Presented) We report two new squaralne dyes substituted at the pyrrolic rings with n-hexyl (squaraine 1) or n-hexenyl (squaraine 2) chains. Although Internal molecular structure variations are minimal, the presence of the terminal double bond results in a much more compact solid-state structure, dramatically affecting charge transport in the thin films; the hole mobility of 2 is ∼ 5x that of 1, and the BHJOPV power conversion efficiency (PCE) of 2 is ∼2x that of 1. PCEs surpassing 2% for ambient solution-processed devices are demonstrated, the largest so far achieved for squaraine-based organic solar cells.

Original languageEnglish
Pages (from-to)4074-4075
Number of pages2
JournalJournal of the American Chemical Society
Issue number12
Publication statusPublished - Mar 31 2010


ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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