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Energy Express

Energy Express

  • Editor: Bernard Kippelen
  • Vol. 20, Iss. S3 — May. 7, 2012
  • pp: A385–A394

Nanophotonic light trapping with patterned transparent conductive oxides

Alok P. Vasudev, Jon A. Schuller, and Mark L. Brongersma  »View Author Affiliations

Optics Express, Vol. 20, Issue S3, pp. A385-A394 (2012)

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Transparent conductive oxides (TCOs) play a crucial role in solar cells by efficiently transmitting sunlight and extracting photo-generated charge. Here, we show how nanophotonics concepts can be used to transform TCO films into effective photon management layers for solar cells. This is accomplished by patterning the TCO layer present on virtually every thin-film solar cell into an array of subwavelength beams that support optical (Mie) resonances. These resonances can be exploited to concentrate randomly polarized sunlight or to effectively couple it to guided and diffracted modes. We first demonstrate these concepts with a model system consisting of a patterned TCO layer on a thin silicon (Si) film and outline a design methodology for high-performance, TCO-based light trapping coatings. We then show that the short circuit current density from a 300 nm thick amorphous silicon (a-Si) cell with an optimized TCO anti-reflection coating can be enhanced from 19.9 mA/cm2 to 21.1 mA/cm2, out of a possible 26.0 mA/cm2, by using an optimized nanobeam array. The key differences and advantages over plasmonic light trapping layers will be discussed.

© 2012 OSA

OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(290.4020) Scattering : Mie theory
(350.6050) Other areas of optics : Solar energy
(350.4238) Other areas of optics : Nanophotonics and photonic crystals

ToC Category:

Original Manuscript: January 12, 2012
Revised Manuscript: March 5, 2012
Manuscript Accepted: March 9, 2012
Published: March 15, 2012

Alok P. Vasudev, Jon A. Schuller, and Mark L. Brongersma, "Nanophotonic light trapping with patterned transparent conductive oxides," Opt. Express 20, A385-A394 (2012)

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