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Proceedings Paper

Optical properties of vertical silicon nanowire arrays with random position, diameter, or length
Author(s): Hua Bao; Xiulin Ruan
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Paper Abstract

The optical properties of ordered and disordered vertical silicon nanowire arrays, including random position, diameter, and length, are investigated using the finite-difference time-domain method. The ordered array with diameter of 100 nm shows overall small reflection and large absorption. An absorption peak is located at 2.4 eV, which is due to the optical resonance effect. Both randomly-positioned and random diameter arrays remain unreflective as the ordered array. The absorptance of randomly-positioned nanowire arrays has similar frequency dependence as ordered array, while it is enhanced due to the enhanced scattering. Random diameter array has a different absorptance profile and no evident absorption peak is observed, which is explained by the different resonant frequencies of the inclusion nanowires. Random length can create a random rough top surface on the nanowire arrays, which can reduce reflection and enhance absorption compared to uniform top surface.

Paper Details

Date Published: 24 August 2010
PDF: 7 pages
Proc. SPIE 7772, Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion, 77721J (24 August 2010); doi: 10.1117/12.862265
Show Author Affiliations
Hua Bao, Purdue Univ. (United States)
Xiulin Ruan, Purdue Univ. (United States)

Published in SPIE Proceedings Vol. 7772:
Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion
Loucas Tsakalakos, Editor(s)

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