• bulk heterojunction solar cells;
  • small molecules;
  • perylene diimide;
  • non-fullerene acceptors
Thumbnail image of graphical abstract

By combining the molecular donor p-DTS(FBTTh2)2 with a readily produced perylene diimide acceptor we are able to achieve a power conversion efficiency of 3.0%, making this one of the most efficient non-fullerene organic solar cells to date. The reduced power conversion efficiency of the present system compared to the use of phenyl-C71-butyric acid methyl ester as an electron acceptor is shown to primarily be related to a significant reduction in the internal quantum efficiency. These results indicate the potential of small-molecule:non-fullerene bulk-heterojunction organic photovoltaics.