Synthesis of acenaphthyl and phenanthrene based fused-aromatic thienopyrazine co-polymers for photovoltaic and thin film transistor applications

Rajib Mondal, Nobuyuki Miyaki, Hector A. Becerril, Joseph E. Norton, Jack Parmer, Alex C. Mayer, Ming L. Tang, Jean Luc Brédas, Michael D. McGehee, Zhenan Bao

Research output: Contribution to journalArticlepeer-review

99 Scopus citations

Abstract

Dithiophene and fluorene co-polymers containing fused aromatic thieno[3,4-b]pyrazine moieties were synthesized for organic thin film transistor (OTFT) and organic photovoltaic (OPV) applications. Suzuki and Stille polycondensation reactions were used for the polymerization. The band gap (Eg) of the polymers was tuned in the range of 1.15-1.6 eV to match the solar spectrum. Density functional theory calculations were carried out to rationalize the low band gaps. These polymers showed field effect mobility (μ) as high as 0.2 cm2/(V.s) with an on/off ratio as high as 106 in OTFT devices. Interestingly, one polymer in this class also showed ambipolar charge transport. Power conversion efficiency (PCE) up to 1.3% was achieved in bulk heterojunction solar cells, indicating that these materials are promising for OPV applications.

Original languageEnglish (US)
Pages (from-to)3618-3628
Number of pages11
JournalChemistry of Materials
Volume21
Issue number15
DOIs
StatePublished - Aug 11 2009
Externally publishedYes

ASJC Scopus subject areas

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

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