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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 12 — Jun. 4, 2012
  • pp: 13226–13237

Resonant enhancement of dielectric and metal nanoparticle arrays for light trapping in solar cells

E. Wang, T. P. White, and K. R. Catchpole  »View Author Affiliations

Optics Express, Vol. 20, Issue 12, pp. 13226-13237 (2012)

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We numerically investigate the light trapping properties of two-dimensional diffraction gratings formed from silver disks or titanium dioxide pillars, placed on the rear of Si thin-film solar cells. In contrast to previous studies of front-surface gratings, we find that metal particles out-perform dielelectric ones when placed on the rear of the cell. By optimizing the grating geometry and the position of a planar reflector, we predict short circuit current enhancements of 45% and 67% respectively for the TiO2 and silver nanoparticles. Furthermore, we show that interference effects between the grating and reflector can significantly enhance, or suppress, the light trapping performance. This demonstrates the critical importance of optimizing the reflector as an integral part of the light trapping structure.

© 2012 OSA

OCIS Codes
(040.5350) Detectors : Photovoltaic
(050.1950) Diffraction and gratings : Diffraction gratings
(240.6680) Optics at surfaces : Surface plasmons
(310.6845) Thin films : Thin film devices and applications

ToC Category:
Solar Energy

Original Manuscript: March 9, 2012
Revised Manuscript: May 22, 2012
Manuscript Accepted: May 23, 2012
Published: May 29, 2012

E. Wang, T. P. White, and K. R. Catchpole, "Resonant enhancement of dielectric and metal nanoparticle arrays for light trapping in solar cells," Opt. Express 20, 13226-13237 (2012)

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