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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 18 — Sep. 9, 2013
  • pp: 20738–20746

Dielectric back scattering patterns for light trapping in thin-film Si solar cells

M. van Lare, F. Lenzmann, and A. Polman  »View Author Affiliations

Optics Express, Vol. 21, Issue 18, pp. 20738-20746 (2013)

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We experimentally compare the light trapping efficiency of dielectric and metallic backscattering patterns in thin-film a-Si:H solar cells. We compare devices with randomly patterned Ag back contacts that are covered with either flat or patterned aluminum-doped ZnO (AZO) buffer layers and find the nanostructure at the AZO/a-Si:H interface is key to achieve efficient light trapping. Simulations show that purely dielectric scattering patterns with flat Ag and a patterned AZO/a-Si:H interface can outperform geometries in which the Ag is also patterned. The scattering from the dielectric patterns is due to geometrical Mie resonances in the AZO nanostructures. The optimized dielectric geometries avoid parasitic Ohmic losses due to plasmon resonances in the Ag, and open the way to a large number of new light trapping designs based on purely dielectric resonant light scattering.

© 2013 OSA

OCIS Codes
(040.5350) Detectors : Photovoltaic
(290.4020) Scattering : Mie theory

ToC Category:
Solar Energy

Original Manuscript: May 23, 2013
Revised Manuscript: August 2, 2013
Manuscript Accepted: August 12, 2013
Published: August 28, 2013

M. van Lare, F. Lenzmann, and A. Polman, "Dielectric back scattering patterns for light trapping in thin-film Si solar cells," Opt. Express 21, 20738-20746 (2013)

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