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Optical Materials Express

Optical Materials Express

  • Editor: David J. Hagan
  • Vol. 2, Iss. 11 — Nov. 1, 2012
  • pp: 1671–1679

GaAs nanopillar arrays with suppressed broadband reflectance and high optical quality for photovoltaic applications

R. Sanatinia, K. M. Awan, S. Naureen, N. Anttu, E. Ebraert, and S. Anand  »View Author Affiliations


Optical Materials Express, Vol. 2, Issue 11, pp. 1671-1679 (2012)
http://dx.doi.org/10.1364/OME.2.001671


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Abstract

We report on fabrication and optical characterization of GaAs nanopillar (NP) arrays, obtained using a combination of low-cost mask generation by self-assembled silica particles (nanosphere lithography) and dry etching. Tapered structures (conical and frustum NP arrays) are fabricated by appropriate optimization of process parameters. Significant suppression of surface reflectance is observed for both geometries over a broad wavelength range. Simulations, based on finite difference time domain (FDTD) method, show good agreement with reflectivity measurements and serve as a guideline for design of NPs and understanding their interaction with light. A combination of wet chemical etching and sulfur–based passivation of GaAs NPs, results in more than one order of magnitude enhancement in PL intensity and recovery of PL line-width, which is very promising for photovoltaic applications.

© 2012 OSA

OCIS Codes
(040.5350) Detectors : Photovoltaic
(300.1030) Spectroscopy : Absorption
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence
(350.4238) Other areas of optics : Nanophotonics and photonic crystals
(220.4241) Optical design and fabrication : Nanostructure fabrication
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Nanomaterials

History
Original Manuscript: October 8, 2012
Revised Manuscript: October 22, 2012
Manuscript Accepted: October 22, 2012
Published: October 29, 2012

Citation
R. Sanatinia, K. M. Awan, S. Naureen, N. Anttu, E. Ebraert, and S. Anand, "GaAs nanopillar arrays with suppressed broadband reflectance and high optical quality for photovoltaic applications," Opt. Mater. Express 2, 1671-1679 (2012)
http://www.opticsinfobase.org/ome/abstract.cfm?URI=ome-2-11-1671


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