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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 22, Iss. S1 — Jan. 13, 2014
  • pp: A68–A79

Investigation of optical absorptance of one-dimensionally periodic silicon gratings as solar absorbers for solar cells

Nghia Nguyen-Huu, Michael Cada, and Jaromír Pištora  »View Author Affiliations


Optics Express, Vol. 22, Issue S1, pp. A68-A79 (2014)
http://dx.doi.org/10.1364/OE.22.000A68


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Abstract

A rigorous design using periodic silicon (Si) gratings as absorbers for solar cells in visible and near-infrared regions is numerically presented. The structure consists of a subwavelength Si grating layer on top of an Si substrate. Ranges of grating dimensions are preliminary considered satisfying simple and feasible fabrication techniques with an aspect ratio defined as the ratio of the grating thickness (d) and the grating lamella width (w), with 0 < d/w < 1.0. The subwavelength grating structure (SGS) is assumed to comprise different lamella widths and slits within each period in order to finely tune the grating profile such that the absorptance is significantly enhanced in the whole wavelength region. The results showed that the compound SGS yields an average absorptance of 0.92 which is 1.5 larger than that of the Si plain and conventional grating structures. It is shown that the absorptance spectrum of the proposed SGS is insensitive to the angle of incidence of the incoming light. The absorptance enhancement is also investigated by computing magnetic field, energy density, and Poynting vector distributions. The results presented in this study show that the proposed method based on nanofabrication techniques provides a simple and promising solution to design solar energy absorbers or other energy harvesting devices.

© 2013 Optical Society of America

OCIS Codes
(040.6040) Detectors : Silicon
(050.2770) Diffraction and gratings : Gratings
(350.6050) Other areas of optics : Solar energy
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Light Trapping for Photovoltaics

History
Original Manuscript: August 5, 2013
Revised Manuscript: October 22, 2013
Manuscript Accepted: November 25, 2013
Published: December 4, 2013

Citation
Nghia Nguyen-Huu, Michael Cada, and Jaromír Pištora, "Investigation of optical absorptance of one-dimensionally periodic silicon gratings as solar absorbers for solar cells," Opt. Express 22, A68-A79 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-S1-A68


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