12 October 2012 Plasmonic-grating-assisted absorption enhancement in thin film semiconductors
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Abstract
The well-known ability of metallic grooves and nanorods to induce the formation of plasmonic resonant features has stimulated the interest in these structures for light harvesting applications. We show that the presence of semi-circular shaped nanorods improves photon absorption in a thin semiconductor film in contact with the plasmonic nanostructure. Geometric parameters like radius of nanoparticle and semiconductor thickness are investigated to tailor the dispersion of resonant modes of the metal/semiconductor system: both localized surface plasmon and guided mode resonances are found to improve absorption features and extend absorption enhancement across the solar spectrum. We demonstrate that properly designed structures are able to trap wideband light sources (sunlight for photovoltaic devices) in thin semiconductor films, and have the potential to enhance photon absorption in spectral regions where the semiconductor is a poor absorber, i.e. near the electronic band edge.
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M.A. Vincenti, D. de Ceglia, Michael Scalora, "Plasmonic-grating-assisted absorption enhancement in thin film semiconductors", Proc. SPIE 8471, Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion III, 84710U (12 October 2012); doi: 10.1117/12.929288; https://doi.org/10.1117/12.929288
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