Fluorene functionalised sexithiophenes - utilising intramolecular charge transfer to extend the photocurrent spectrum in organic solar cells

Peter Skabara, Rory Berridge, Igor M. Serebryakov, Alexander L. Kanibolotsky, Lyudmila Kanibolotskaya, Sergey Gordeyev, Igor F. Perepichka, N. Serdar Sariciftci, Christoph Winder

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24 Citations (Scopus)

Abstract

A new series of oligothiophenes bearing electron deficient fluorene units have been prepared and characterised. The materials are functionalised by C8/C11 alkyl chains or triethylene glycol side groups, yet the higher oligomers remain poorly soluble. The absorption characteristics of a sexithiophene analogue (compound 3) have been studied by UV-vis and photoinduced absorption spectroscopy. Photovoltaic cells have been fabricated from blends of 3 and fullerene derivative [6,6]-phenyl-C61 butyric acid methyl ester (PCBM). The photocurrent spectrum of the device matches the absorption spectrum of the sexithiophene system which incorporates an intramolecular charge transfer band arising from the 1,3-dithiole-fluorene units. A modest power conversion efficiency of 0.1% was achieved.
Original languageUndefined/Unknown
Pages (from-to)1055-1062
Number of pages8
JournalJournal of Materials Chemistry
Volume17
Issue number11
DOIs
Publication statusPublished - 2007

Keywords

  • sexithiophenes
  • intramolecular charge transfer
  • photocurrent spectrum
  • organic solar cells

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