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Light Trapping with Silicon Light Funnel Arrays.

Ashish Prajapati1, Yuval Nissan2, Tamir Gabay3

  • 1Department of Electrical and Computer Engineering, Ben-Gurion University of the Negev, POB 653, Beer-Sheva 8410501, Israel. ashish@post.bgu.ac.il.

Materials (Basel, Switzerland)
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Summary

Silicon light funnels (LF) enhance solar spectrum absorption. Coupling LF arrays with substrates increases absorption by ~10% due to optical excitation and mode hybridization.

Keywords:
light trappinglight-funnel arraysmode excitationnanophotonicsphoton managementphotovoltaicssolar cells

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Area of Science:

  • Nanophotonics
  • Optical Engineering
  • Materials Science

Background:

  • Silicon light funnels (LF) are 3D subwavelength inverted cone structures.
  • LF arrays offer efficient light trapping via complex Mie modes.
  • LF arrays demonstrate broadband absorption enhancement for the solar spectrum.

Purpose of the Study:

  • To numerically investigate the optical coupling between surface LF arrays and substrates.
  • To quantify the absorption enhancement in LF array-substrate systems.

Main Methods:

  • Numerical simulation of optical properties.
  • Analysis of light-matter interactions in LF-substrate complexes.

Main Results:

  • Absorption in LF array-substrate complexes is higher than in LF arrays alone (~10% increase).
  • LF arrays act as efficient surface elements, imparting momentum to illumination.
  • Optical excitation of the substrate occurs via near-field concentration, guided modes, and mode hybridization.

Conclusions:

  • Substrate integration significantly boosts absorption in silicon light funnel devices.
  • LF arrays effectively enhance light absorption by exciting underlying substrates.
  • This work highlights the potential of LF-substrate systems for advanced solar energy applications.