Abstract
Porous nanowires NWs with tunable thermal conductance are examined as a candidate for thermoelectric devices with high efficiency. Thermal conductance l of porous NWs is calculated using the phonon dispersion obtained from a modified valence force field model. Porosity in the NWs break the crystal symmetry leading to the reduction in ballistic l. 100 Si and Ge NWs show similar percentage reductions in l for the same amount of porosity. The model predicts an anisotropic reduction in l in SiNWs, with 111 showing the maximum reduction followed by 100 and 110 for a similar hole radius. The reduction in l is attributed to phonon localization and anisotropic mode reduction.
Keywords
porous nanowires, tunable thermal conductance
DOI
10.1063/1.3556648
Citation
Applied Physics Letters 98, 083106 (2011)
Date of this Version
2-22-2011
Recommended Citation
Paul, Abhijeet and Klimeck, Gerhard, "Tuning Lattice Thermal Conductance by Porosity Control in Ultrascaled Si and Ge Nanowires" (2011). Birck and NCN Publications. Paper 726.
http://dx.doi.org/10.1063/1.3556648
Comments
Copyright (2011) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Appl. Phys. Lett. 98, 083106 (2011) and may be found at http://dx.doi.org/10.1063/1.3556648. The following article has been submitted to/accepted by Applied Physics Letters. Copyright (2011) Abhijeet Paul and Gerhard Klimeck. This article is distributed under a Creative Commons Attribution 4.0 Unported License.