Effect of fluorination on the properties of a donor-acceptor copolymer for use in photovoltaic cells and transistors

Hugo Bronstein, Jarvist M. Frost, Afshin Hadipour, Youngju Kim, Christian B. Nielsen, Raja Shahid Ashraf, Barry P. Rand, Scott Watkins, Iain McCulloch

Research output: Contribution to journalArticle

173 Scopus citations

Abstract

Two novel indacenodithiophene (IDT) based donor-acceptor conjugated polymers for use in organic field effect transistors and photovoltaic devices are synthesized and characterized. The effect of inclusion of two fluorine atoms on the acceptor portion of the polymer is thoroughly investigated via a range of techniques. The inductively withdrawing and mesomerically donating properties of the fluorine atoms result in a decrease of the highest occupied molecular orbital (HOMO), with little effect on the lowest unoccupied molecular orbital (LUMO) as demonstrated through density functional theory (DFT) analysis. Inclusion of fluorine atoms also leads to a potentially more planar backbone through inter and intrachain interactions. Use of the novel materials in organic field effect transistor (OFET) and organic photovoltaic (OPV) devices leads to high mobilities around 0.1 cm2/(V s) and solar cell efficiencies around 4.5%.

Original languageEnglish (US)
Pages (from-to)277-285
Number of pages9
JournalChemistry of Materials
Volume25
Issue number3
DOIs
StatePublished - Feb 12 2013

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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    Bronstein, H., Frost, J. M., Hadipour, A., Kim, Y., Nielsen, C. B., Ashraf, R. S., Rand, B. P., Watkins, S., & McCulloch, I. (2013). Effect of fluorination on the properties of a donor-acceptor copolymer for use in photovoltaic cells and transistors. Chemistry of Materials, 25(3), 277-285. https://doi.org/10.1021/cm301910t