In:
Applied Physics Letters, AIP Publishing, Vol. 98, No. 8 ( 2011-02-21)
Abstract:
Porous nanowires (NWs) with tunable thermal conductance are examined as a candidate for thermoelectric devices with high efficiency. Thermal conductance (σl) 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 σl. [100] Si and Ge NWs show similar percentage reductions in σl for the same amount of porosity. The model predicts an anisotropic reduction in σl in SiNWs, with [111] showing the maximum reduction followed by [100] and [110] for a similar hole radius. The reduction in σl is attributed to phonon localization and anisotropic mode reduction.
Type of Medium:
Online Resource
ISSN:
0003-6951
,
1077-3118
Language:
English
Publisher:
AIP Publishing
Publication Date:
2011
detail.hit.zdb_id:
211245-0
detail.hit.zdb_id:
1469436-0
