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. 2016 Sep 16;6:32945. doi: 10.1038/srep32945

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Copyright © 2016, The Author(s)

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(a) Example of a quasi-random supercell. The red framed region is the unit cell, designed for light harvesting with (b) a ring shaped Fourier transform spectrum, which enhances the 2^nd to 6^th diffractive orders. The period of all supercells is 1.792 μm. (c–e) patterns which have similar Fourier transform spectra. (f) Corresponding absorption spectra for a 0.4 μm thick silicon thin film assuming a 100% reflective mirror layer at the back side. The calculated short-circuit current refers to the global solar spectrum AM 1.5G²⁵ and assumes 100% internal quantum efficiency. Even though the 3 patterns look rather different in real space, their Fourier distributions and absorption spectra are very similar.