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13 May 2011 Efficient light-trapping nanostructures in thin silicon solar cells
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We examine light-trapping in thin crystalline silicon periodic nanostructures for solar cell applications. Using group theory, we show that light-trapping can be improved over a broad band when structural mirror symmetry is broken. This finding allows us to obtain surface nanostructures with an absorptance exceeding the Lambertian limit over a broad band at normal incidence. Further, we demonstrate that the absorptance of nanorod arrays with symmetry breaking not only exceeds the Lambertian limit over a range of spectrum but also closely follows the limit over the entire spectrum of interest for isotropic incident radiation. These effects correspond to a reduction in silicon mass by two orders of magnitude, pointing to the promising future of thin crystalline silicon solar cells.
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Sang Eon Han, Anastassios Mavrokefalos, Matthew Sanders Branham, and Gang Chen "Efficient light-trapping nanostructures in thin silicon solar cells", Proc. SPIE 8031, Micro- and Nanotechnology Sensors, Systems, and Applications III, 80310T (13 May 2011);

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