Abstract
Reducing reflection and transmission losses in photovoltaic devices is essential for realizinghighly efficient power conversion. Here, we theoretically investigate arrays of radial junctionsilicon wires to determine the optimal geometry for maximized light absorption. Using ageneralized rigorous coupled wave analysis, we calculate the scattering spectra of arrays ofvarying wire radii, length, and lattice filling factors. Near unity absorption, farexceeding that of conventional thin film devices, is calculated for a square array of 20 µm long wires with radii of 200 nm and a filling fraction of 30%. These results suggest apotentially cost-effective route toward high efficiency solar cells.
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