Phonons and thermal transport in Si/SiO2 multishell nanotubes: Atomistic study
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ISACOVA, Calina; COCEMASOV, Alexandr; NIKA, Denis; FOMIN, Vladimir. Phonons and thermal transport in Si/SiO2 multishell nanotubes: Atomistic study. In: Applied Sciences (Switzerland). 2021, nr. 8(11), pp. 1-14. ISSN 2076-3417.
10.3390/app11083419
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Applied Sciences (Switzerland)
Numărul 8(11) / 2021 / ISSN 2076-3417

Phonons and thermal transport in Si/SiO2 multishell nanotubes: Atomistic study


DOI: 10.3390/app11083419
Pag. 1-14

Isacova Calina1, Cocemasov Alexandr1, Nika Denis1, Fomin Vladimir123
 
1 State University of Moldova,
2 Leibniz Institute for Solid State and Materials Reseach, Dresden,
3 National Research Nuclear University MEPhI, Moscow
 
Disponibil în IBN: 5 mai 2021


Rezumat

Thermal transport in the Si/SiO2 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/SiO2 interfaces is another key factor of strong reduction of the thermal conductivity in these structures (down to 0.2 Wm-1K-1 at room temperature). We demonstrate that phonon thermal transport in Si/SiO2 nanotubes can be efficiently suppressed by a proper choice of nanotube geometrical parameters: lateral cross section, thickness and number of shells. We argue that such nanotubes have prospective applications in modern electronics, in cases when low heat conduction is required.

Cuvinte-cheie
Lattice-dynamics approach, Multishell nanotubes, phonons, Thermal transport