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Keywords:

  • conjugated polymers;
  • organic electronics;
  • solar cells;
  • fullerenes;
  • tandem configuration
Thumbnail image of graphical abstract

Solution-processed tandem polymer solar cells with an inverted polarity configuration provide a power conversion efficiency of 5.8%. The tandem cells use an almost loss-free recombination layer and two photoactive layers, with wide and small bandgaps, to increase the power conversion efficiency beyond that of the corresponding single-layer cells.