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Open AccessArticle

Light Trapping with Silicon Light Funnel Arrays

1
Department of Electrical and Computer Engineering, Ben-Gurion University of the Negev, POB 653, Beer-Sheva 8410501, Israel
2
The Ilse-Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, POB 653, Beer-Sheva 8410501, Israel
*
Author to whom correspondence should be addressed.
Materials 2018, 11(3), 445; https://doi.org/10.3390/ma11030445
Received: 5 February 2018 / Revised: 5 March 2018 / Accepted: 15 March 2018 / Published: 19 March 2018
Silicon light funnels are three-dimensional subwavelength structures in the shape of inverted cones with respect to the incoming illumination. Light funnel (LF) arrays can serve as efficient absorbing layers on account of their light trapping capabilities, which are associated with the presence of high-density complex Mie modes. Specifically, light funnel arrays exhibit broadband absorption enhancement of the solar spectrum. In the current study, we numerically explore the optical coupling between surface light funnel arrays and the underlying substrates. We show that the absorption in the LF array-substrate complex is higher than the absorption in LF arrays of the same height (~10% increase). This, we suggest, implies that a LF array serves as an efficient surface element that imparts additional momentum components to the impinging illumination, and hence optically excites the substrate by near-field light concentration, excitation of traveling guided modes in the substrate, and mode hybridization. View Full-Text
Keywords: light trapping; photovoltaics; solar cells; light-funnel arrays; nanophotonics; photon management; mode excitation light trapping; photovoltaics; solar cells; light-funnel arrays; nanophotonics; photon management; mode excitation
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MDPI and ACS Style

Prajapati, A.; Nissan, Y.; Gabay, T.; Shalev, G. Light Trapping with Silicon Light Funnel Arrays. Materials 2018, 11, 445.

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