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Keywords:

  • donor–acceptor systems;
  • energy conversion;
  • fullerenes;
  • polymers;
  • solar cells
Thumbnail image of graphical abstract

Mind the gap! Polymers synthesized by replacing the benzene unit in the acceptor 4,7-dithien-2-yl-2,1,3-benzothiadiazole (DTBT) with a π-electron-deficient pyridine unit (DTPyT) show a smaller bandgap than their DTBT counterparts. Power conversion efficiencies of over 6 % are demonstrated in solar cell studies (see picture; PNDT, PQDT, and PBnDT represent dithiophene derivatives as weak donors).