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Nanowire arrays exhibit efficient light coupling and strong light trapping,making them well suited to solar cell applications. The processes thatcontribute to their absorption are interrelated and highly dispersive, so theonly current method of optimizing the absorption is by intensive numericalcalculations. We present an efficient alternative which depends solely on thewavelength-dependent refractive indices of the constituent materials. We chooseeach array parameter such that the number of modes propagating away from theabsorber is minimized while the number of resonant modes within the absorber ismaximized. From this we develop a semi-analytic method that quantitativelyidentifies the small range of parameters where arrays achieve maximum shortcircuit currents. This provides a fast route to optimizing NW array cellefficiencies by greatly reducing the geometries to study with full devicemodels. Our approach is general and applies to a variety of materials and to alarge range of array thicknesses.

Optimizing Photovoltaic Charge Generation of Nanowire Arrays: A Simple Semi-Analytic Approach