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Keywords:

  • organic solar cells;
  • charge generation;
  • geminate recombination;
  • charge transfer states;
  • driving force;
  • excess energy;
  • morphology;
  • spectroelectrochemistry
Thumbnail image of graphical abstract

The field dependence and yield of free charge carrier generation in polymer:fullerene blends with varying energetic offsets is not affected when the excitation energy is varied from above band-gap to direct CT state excitation. Instead, the ability of the CT state to split is dictated by the energetic offset between the relaxed CT state and the charge separated (CS) state.