Broadband optical absorption by tunable Mie resonances in silicon nanocone arrays.

Abstract:

:Nanostructure arrays such as nanowire, nanopillar, and nanocone arrays have been proposed to be promising antireflection structures for photovoltaic applications due to their great light trapping ability. In this paper, the optical properties of Si nanopillar and nanocone arrays in visible and infrared region were studied by both theoretical calculations and experiments. The results show that the Mie resonance can be continuously tuned across a wide range of wavelength by varying the diameter of the nanopillars. However, Si nanopillar array with uniform diameter exhibits only discrete resonance mode, thus can't achieve a high broadband absorption. On the other hand, the Mie resonance wavelength in a Si nanocone array can vary continuously as the diameters of the cross sections increase from the apex to the base. Therefore Si nanocone arrays can strongly interact with the incident light in the broadband spectrum and the absorbance by Si nanocone arrays is higher than 95% over the wavelength from 300 to 2000 nm. In addition to the Mie resonance, the broadband optical absorption of Si nanocone arrays is also affected by Wood-Rayleigh anomaly effect and metal impurities introduced in the fabrication process.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Wang ZY,Zhang RJ,Wang SY,Lu M,Chen X,Zheng YX,Chen LY,Ye Z,Wang CZ,Ho KM

doi

10.1038/srep07810

subject

Has Abstract

pub_date

2015-01-15 00:00:00

pages

7810

issn

2045-2322

pii

srep07810

journal_volume

5

pub_type

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