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Keywords:

  • Fluorene derivative;
  • Semi-transparent;
  • Solar cells;
  • Polymers
Thumbnail image of graphical abstract

Efficient (4.5% power conversion efficiency) polymer solar cells based on an alternating polyfluorene copolymer are demonstrated. The highest internal quantum efficiency obtained was 87%. The semi-transparent active layer (only 47 nm thick) shows the uniqueness of polymer solar cells and their unconventional applications, such as translucent solar windows for buildings and automobiles.