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Keywords:

  • Bulk heterojunction solar cells;
  • Polymer solar cells;
  • Photovoltaic devices;
  • Organic electronics;
  • Organic semiconductors
Thumbnail image of graphical abstract

Replacing a carbon atom with silicon (see figure) on the main chain of a conjugated polythiophene gives a polysilole with higher crystallinity, improved charge transport, reduced bimolecular recombination, and reduced formation of charge transfer complexes when blended with a fullerene derivative. Optimized bulk heterojunction solar cells using this blend give certified efficiencies of 5.2% under AM1.5 illumination.