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Synthesis and photovoltaic properties of benzimidazole-based copolymer with fluorine atom

Abstract

A new accepter unit, 5,6-difluoro-2,2-dimethyl-2H-benzo[d]imidazole, was prepared and utilized for the synthesis of the conjugated polymers containing electron donor–acceptor pair for OPVs. Difluoro-dimethyl-2H-benzoimidazole unit was designed to introduce electron-withdrawing F atom in dimethyl-2H-benzimidazole unit to improve deeper HOMO and higher V OC of the polymer. New semiconducting copolymer with dioctyloxybenzodithiophene, as the electron-rich unit, and difluoro-dimethyl-2H-benzoimidazole, as the electron-deficient unit, was synthesized by Stille polymerization.

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Acknowledgments

This work was supported by a Research Grant of Pukyong National University (2016 year).

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Correspondence to Jin Young Kim or Youngeup Jin.

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Song, S., Kim, T., Kang, D. et al. Synthesis and photovoltaic properties of benzimidazole-based copolymer with fluorine atom. Polym. Bull. 73, 2511–2519 (2016). https://doi.org/10.1007/s00289-016-1679-2

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  • DOI: https://doi.org/10.1007/s00289-016-1679-2

Keywords

  • Polymer
  • Solar cells
  • Synthesis
  • Fluorine atom
  • Benzoimidazole