Preprint Article Version 1 This version is not peer-reviewed

Light Trapping with Silicon Light Funnel Arrays

Version 1 : Received: 5 February 2018 / Approved: 6 February 2018 / Online: 6 February 2018 (00:48:21 CET)

A peer-reviewed article of this Preprint also exists.

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

Journal reference: Materials 2018, 11, 445
DOI: 10.3390/ma11030445

Abstract

Silicon light funnels are three-dimensional subwavelength structures in the shape of inverted cones with respect to the incoming illumination. Light funnel arrays can serve as an efficient absorbing layers on account of their light trapping capabilities associated with the presence of high density complex Mie modes. Specifically, light funnel arrays exhibit broadband absorption enhancement of the of the solar spectrum. In the current study, we numerically explore the optical coupling between surface light funnel arrays and underlying substrates. We show that the absorption in LF array-substrate complex is higher than the absorption in LF arrays of the same height (~10% increase). This, we suggest, imply 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.

Subject Areas

light trapping; photovoltaics; solar cells; light-funnel arrays; nanophotonics; photon management; mode excitation

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