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Keywords:

  • dithienocarbazole;
  • isoindigo;
  • low bandgap conjugated polymers;
  • polymer solar cells
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Three highly rigid and planar low-bandgap conjugated polymers comprising alternate isoindigo and dithienocarbazole groups are synthesized for the fabrication of high performance polymer solar cells. Power conversion efficiencies of up to 7.2% for conventional devices and 8.2% for inverted devices are demonstrated.