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Nano-photonic and nano-plasmonic enhancements in thin film silicon solar cells

TitleNano-photonic and nano-plasmonic enhancements in thin film silicon solar cells
Publication TypeJournal Article
Year of Publication2014
AuthorsPattnaik, S, Chakravarty, N, Biswas, R, Dalal, VL, Slater, D
JournalSolar Energy Materials and Solar Cells
Volume129
Pagination115-123
Date Published10
Type of ArticleArticle
ISBN Number0927-0248
Accession NumberWOS:000342267400014
Keywordsabsorption, back-reflectors, efficiency, germanium alloys, growth, lambertian limit, Light trapping, Photonic crystal, Solar cells, super-lattices
Abstract

s equations in Fourier space. Simulations found optimized architectures for a triangular lattice of metallic nano-cones as a back-reflector, and a conformal solar cell geometry. The periodically patterned photonic crystal based substrates achieve (1) high diffraction, enhancing the path length of light in thin absorber layers and (2) plasmonic concentration of light intensity. Simulations predict an absorption enhancement of 43% for a 12-period superlattice of 800 nm thickness. The optimized pitch of the photonic lattice is near 700 nm. Experimentally the periodically patterned substrates were fabricated with nano-imprint lithography, and utilized as a substrate for the superlattice cells. We measured a large photo-current enhancement between the textured photonic crystal based superlattice cell and the flat cell of 21%, together with long-wavelength quantum efficiency enhancements beyond 600 nm. This is an approach to achieving thin film solar cells with high currents through advanced light-trapping techniques on novel materials. (C) 2014 Elsevier B.V. All rights reserved.

DOI10.1016/j.solmat.2014.05.010
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Photonics