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We suggest a novel concept of efficient light-trapping structures forthin-film solar cells based on arrays of planar nanoantennas operating far fromplasmonic resonances. The operation principle of our structures relies on theexcitation of chessboard-like collective modes of the nanoantenna arrays withthe field localized between the neighboring metal elements. We demonstratedtheoretically substantial enhancement of solar-cell short-circuit current bythe designed light-trapping structure in the whole spectrum range of thesolar-cell operation compared to conventional structures employinganti-reflecting coating. Our approach provides a general background for adesign of different types of efficient broadband light-trapping structures forthin-film solar-cell technologically compatible with large-area thin-filmfabrication techniques.

Enhanced Efficiency of Light-Trapping Nanoantenna Arrays for Thin Film Solar Cells