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Keywords:

  • fullerenes;
  • polymers;
  • solar cells;
  • stability;
  • surface analysis
Thumbnail image of graphical abstract

Changes of the initial performance of polymer/fullerene solar cells are investigated by continuous illumination with simulated solar light. The fill factor gradually decreases with exposure time, whereas the series resistance gradually increases. These initial performance changes are ascribed to a marginal change in the surface composition of the active layer.