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, Jr-Hau He

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

Large-area, periodic Si nanopillar arrays (NPAs) with the periodicity of 100 nm and the diameter of 60 nm were fabricated by metalassisted 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.

Original languageEnglish (US)
Pages (from-to)A94-A103
JournalOptics Express
Volume20
Issue number101
DOIs
StatePublished - Jan 2 2012

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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