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Keywords:

  • organic solar cells;
  • organic photovoltaics;
  • bilayer;
  • solution processing;
  • morphology
Thumbnail image of graphical abstract

We investigate the evolution of the vertical morphology in a solution-processed P3HT/PCBM “bilayer” organic solar cell using a combination of techniques, including neutron reflectometry. By correlating the device performance with the active layer morphology, we establish that the solution processed bilayer concept is a misnomer and sequential solution processing is an elegant way to make bulk heterojunction organic solar cells with high efficiency.