Shape and orientation effects on the ballistic phonon thermal properties of ultra-scaled Si nanowires

Details Shape and orientation effects on the ballistic phonon thermal properties of ultra-scaled Si nanowires Shape and orientation effects on the ballistic phonon thermal properties of ultra-scaled Si nanowires

2011-08-12

arxiv.org/abs/1108.2551v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 figures, 4 tables, submitted to JAP

Scientific paper

The effect of geometrical confinement, atomic position and orientation of Silicon nanowires (SiNWs) on their thermal properties are investigated using the phonon dispersion obtained using a Modified Valence Force Field (MVFF) model. The specific heat ($C_{v}$) and the ballistic thermal conductance ($\kappa^{bal}_{l}$) shows anisotropic variation with changing cross-section shape and size of the SiNWs. The $C_{v}$ increases with decreasing cross-section size for all the wires. The triangular wires show the largest $C_{v}$ due to their highest surface-to-volume ratio. The square wires with [110] orientation show the maximum $\kappa^{bal}_{l}$ since they have the highest number of conducting phonon modes. At the nano-scale a universal scaling law for both $C_{v}$ and $\kappa^{bal}_{l}$ are obtained with respect to the number of atoms in the unit cell. This scaling is independent of the shape, size and orientation of the SiNWs revealing a direct correlation of the lattice thermal properties to the atomistic properties of the nanowires. Thus, engineering the SiNW cross-section shape, size and orientation open up new ways of tuning the thermal properties at the nanometer regime.

Affiliated with

Also associated with

No associations

Rating

Shape and orientation effects on the ballistic phonon thermal properties of ultra-scaled Si nanowires does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Shape and orientation effects on the ballistic phonon thermal properties of ultra-scaled Si nanowires, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Shape and orientation effects on the ballistic phonon thermal properties of ultra-scaled Si nanowires will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-15830