Introducing a new triazoloquinoxaline-based fluorene copolymer for organic photovoltaics: Synthesis, characterization, and photovoltaic properties

Derya Baran*, Felix M. Pasker, Stephan Le Blanc, Gregor Schnakenburg, Tayebeh Ameri, Sigurd Höger, Christoph J. Brabec

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

A new donor-acceptor copolymer consisting of triazoloquinoxaline and 9,9-dialkylfluorene units on the main chain has been synthesized, characterized and evaluated as donor material in bulk heterojunction solar cells using PC 61BM as an acceptor. The resulting polymer PTQF showed good thermal stability and solubility in common organic solvents. Cyclic Voltammetry measurements showed that the PTQF has HOMO-LUMO energy levels of -5.13 and -3.62 eV, respectively. DFT calculations revealed that the HOMO is delocalized all over the thiophene and fluorene units and the LUMO is localized mainly on the triazole and pyrazine units. PTQF absorbs broadly in the visible region and exhibits a bandgap of 1.4 eV. Photovoltaic devices exhibited 1.7% efficiency for 1:2 PTQF:PC61BM blend ratio using Ca/Ag electrodes.

Original languageEnglish (US)
Pages (from-to)987-992
Number of pages6
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume51
Issue number4
DOIs
StatePublished - Feb 15 2013

Keywords

  • Suzuki coupling
  • benzotriazole
  • conducting polymers
  • conjugated polymers
  • electrochemistry
  • fluorene copolymer
  • organic photovoltaics
  • triazoloquinoxaline

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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