Journal
OPTICS EXPRESS
Volume 16, Issue 13, Pages 9332-9343Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.16.009332
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We suggest a design for a coating that could be applied on top of any solar cell having at least one diffusing surface. This coating acts as an angle and wavelength selective filter, which increases the average path length and absorptance at long wavelengths without altering the solar cell performance at short wavelengths. The filter design is based on a continuous variation of the refractive index in order to minimize undesired reflection losses. Numerical procedures are used to optimize the filter for a 10 mu m thick monocrystalline silicon solar cell, which lifts the efficiency above the Auger limit for unconcentrated illumination. The feasibility to fabricate such filters is also discussed, considering a finite available refractive index range. (C) 2008 Optical Society of America.
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