Large integrated absorption enhancement in plasmonic solar cells by combining metallic gratings and antireflection coatings

Large integrated absorption enhancement in plasmonic solar cells by combining metallic gratings and antireflection coatings

Year:2011
Author(s):J.N. Munday and Harry A. Atwater
Citation(s):Nano Lett. (Cover) 11, 2195 2201 (2011)

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Abstract: We describe an ultrathin solar cell architecture that combines the benefits of both plasmonic photovoltaics and traditional antireflection coatings. Spatially resolved electron generation rates are used to determine the total integrated current improvement under AM1.5G solar illumination, which can reach a factor of 1.8. The frequency-dependent absorption is found to strongly correlate with the occupation of optical modes within the structure, and the improved absorption is mainly attributed to improved coupling to guided modes rather than localized resonant modes.