Title: Phonon thermal conductivity suppression of bulk silicon nanowire composites for efficient thermoelectric conversion
Authors: Chen, Ting-Gang
Yu, Peichen
Chou, Rone-Hwa
Pan, Ci-Ling
光電工程學系
Department of Photonics
Issue Date: 13-Sep-2010
Abstract: Vertically-aligned silicon nanowires (SiNWs) that demonstrate reductions of phonon thermal conductivities are ideal components for thermoelectric devices. In this paper, we present large-area silicon nanowire arrays in various lengths using a silver-induced, electroless-etching method that is applicable to both n- and p-type substrates. The measured thermal conductivities of nanowire composites are significantly reduced by up to 43%, compared to that of bulk silicon. Detailed calculations based on the series thermal resistance and phonon radiative transfer models confirm the reduction of thermal conductivity not only due to the increased air fraction, but also the nanowire size effect, suggesting the soundness of employing bulk silicon nanowire composites as efficient thermoelectric materials. (C) 2010 Optical Society of America
URI: http://hdl.handle.net/11536/32197
ISSN: 1094-4087
Journal: OPTICS EXPRESS
Volume: 18
Issue: 19
Begin Page: A467
End Page: A476
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