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. 2017 Apr 11;7:46478. doi: 10.1038/srep46478

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(A) Reflectance and (B) absorbance spectra of graphene/planar Si, planar Si, graphene/pyramidal Si and pyramidal Si. Compared with graphene/planar Si, graphene on pyramidal Si displays the reduced reflectance and higher absorbance in the entire wavelength range owing to the effective antireflection.