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Keywords:

  • hierarchical structures;
  • ZnO nanowires;
  • antireflection;
  • superhydrophobic surfaces;
  • solar cells
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A novel hierarchical structure integrating ZnO-nanowire arrays on Si micropyramids is reported as an effective antireflection layer for improving the solar-cell conversion efficiency. This structure displays a broadband reflection suppression with an average weighted reflectance of 3.2%. Solar cells based on the hierarchal structure show a high conversion efficiency of 16.0%, as well as a superior self-cleaning property.