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Keywords:

  • solar cells;
  • conjugate polymers;
  • photonics
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Polythiophene:fullerene bulk-heterojunction solar cells are fabricated on a one-dimensional photoresist grating of 2 μm pitch and 300 nm height. These dimensions ensure conformal coating of the photovoltaic active-layer and lead to higher power conversion efficiency due to light-trapping, especially for higher wavelength photons.