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Keywords:

  • fullerene;
  • photovoltaics;
  • solar cells;
  • electron transport;
  • bulk heterojunction
Thumbnail image of graphical abstract

Adding a compact dihydromethano (CH2) group to a 58π-indene fullerene (C60(Ind)) creates a 56π-electron dihydromethano/indene fullerene (C60(CH2)(Ind)) and raises the LUMO level with only a minimal increase in size. This class of compounds features reduced conjugation that raises the LUMO level, and a high electron mobility because of the small CH2 addend.