Phonons and thermal transport in Si/SiO multishell nanotubes: Atomistic study
arXiv:2011.06676 · doi:10.3390/app11083419
Abstract
Thermal transport in the Si/SiO multishell nanotubes is investigated theoretically. The phonon energy spectra are obtained using the atomistic Lattice Dynamics approach. Thermal conductivity is calculated using the Boltzmann transport equation within the relaxation time approximation. Redistribution of the vibrational spectra in multishell nanotubes leads to a decrease of the phonon group velocity and the thermal conductivity as compared to homogeneous Si nanowires. Phonon scattering on the Si/SiO interfaces is another key factor of strong reduction of the thermal conductivity in these structures (down to 0.2 W/mK at room temperature). We demonstrate that phonon thermal transport in Si/SiO nanotubes can be efficiently suppressed by a proper choice of nanotube's geometrical parameters: lateral cross-section, thickness and number of shells.
arXiv comment14 pages, 4 figures
References in corpus (9)
- Dimensional crossover of thermal transport in few-layer graphene materials
- Calculation of nanowire thermal conductivity using complete phonon dispersion relations
- Impact of Phonon Surface Roughness Scattering on Thermal Conductivity of Thin Si Nanowires
- Controlling phonons and photons at the wavelength-scale: silicon photonics meets silicon phononics
- Remarkable Reduction of Thermal Conductivity in Silicon Nanotubes
- The role of lighter and heavier embedded nanoparticles on the thermal conductivity of SiGe alloys
- Thermal Conductivity Inhibition in Phonon Engineered Core-Shell Cross-Section Modulated Si/Ge Nanowires
- Thermal transport in semiconductor nanostructures, graphene and related two-dimensional materials
- Phonon Spectrum Engineering in Rolled-up Nano- and Micro-Architectures