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Energy Express

  • Editor: Bernard Kippelen
  • Vol. 20, Iss. S1 — Jan. 2, 2012
  • pp: A94–A103

Periodic Si nanopillar arrays by anodic aluminum oxide template and catalytic etching for broadband and omnidirectional light harvesting

Hsin-Ping Wang, Kun-Tong Tsai, Kun-Yu Lai, Tzu-Chiao Wei, Yuh-Lin Wang, and Jr-Hau He  »View Author Affiliations

Optics Express, Vol. 20, Issue S1, pp. A94-A103 (2012)

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Large-area, periodic Si nanopillar arrays (NPAs) with the periodicity of 100 nm and the diameter of 60 nm were fabricated by metal-assisted chemical etching with anodic aluminum oxide as a patterning mask. The 100-nm-periodicity NPAs serve an antireflection function especially at the wavelengths of 200~400 nm, where the reflectance is decreased to be almost tenth of the value of the polished Si (from 62.9% to 7.9%). These NPAs show very low reflectance for broadband wavelengths and omnidirectional light incidence, attributed to the small periodicity and the stepped refractive index of NPA layers. The experimental results are confirmed by theoretical calculations. Raman scattering intensity was also found to be significantly increased with Si NPAs. The introduction of this industrial-scale self-assembly methodology for light harvesting greatly advances the development of Si-based optical devices.

© 2011 OSA

OCIS Codes
(000.0000) General : General
(000.2700) General : General science

Original Manuscript: November 22, 2011
Revised Manuscript: December 11, 2011
Manuscript Accepted: December 12, 2011
Published: December 21, 2011

Hsin-Ping Wang, Kun-Tong Tsai, Kun-Yu Lai, Tzu-Chiao Wei, Yuh-Lin Wang, and Jr-Hau He, "Periodic Si nanopillar arrays by anodic aluminum oxide template and catalytic etching for broadband and omnidirectional light harvesting," Opt. Express 20, A94-A103 (2012)

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