Thienopyrazine-based low-bandgap poly(heteroaryleneethynylene)s for photovoltaic devices

Raja Ashraf*, Munazza Shahid, Elisabeth Klemm, Maher Al-Ibrahim, Steffi Sensfuss

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

164 Scopus citations

Abstract

Low-bandgap π-conjugated polymers that consist of alkyl thiophene/alkoxy phenylene and 2,3-diphenylthieno[3,4-b]pyrazine units have been prepared in high yields by a Sonogashira polycondensation. The copolymers are characterized by NMR, IR, UV, GPC, and elemental analysis. Thin films of the polymers P1, P2, and P3 exhibit an optical bandgap of ≈1.57-1.60 eV. Under simulated AM 1.5 conditions P2/PCBM devices on polyester foil provide a short circuit current of ISC = 10.72 mA · cm-2, an open circuit voltage of V = 0.67 V, and a power conversion efficiency of 2.37%.

Original languageEnglish (US)
Pages (from-to)1454-1459
Number of pages6
JournalMacromolecular Rapid Communications
Volume27
Issue number17
DOIs
StatePublished - Sep 4 2006

Keywords

  • Conjugated polymers
  • Low bandgap polymers
  • Organic solar cells
  • Photophysics
  • Thienopyrazine

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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