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Lattice Thermal Conductivity of Ultra-Thin Freestanding Layers: Face-Centered Cubic Cell Model versus Continuum Approach

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Abstract:

In the presented paper we report on the calculation of the lattice thermal conductivity of ultra-thin freestanding Si layers using face-centered cubic cell lattice dynamic model and continuum approach for acoustic phonons. The detailed comparison between phonon energy spectra and group velocities obtained in both models is realized. It has been demonstrated that the continuum approach significantly overestimates the lattice thermal conductivity for medium and high temperatures due to the overstating of average group velocities for high-energy phonon modes. The obtained results can be used for the accurate description of the phonon thermal transport in nanostructures.

Keywords: ACOUSTIC PHONONS; NANOSTRUCTURE; SILICON; THERMAL CONDUCTIVITY

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jno.2009.1018

Publication date: April 1, 2009

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  • Journal of Nanoelectronics and Optoelectronics (JNO) is an international and cross-disciplinary peer reviewed journal to consolidate emerging experimental and theoretical research activities in the areas of nanoscale electronic and optoelectronic materials and devices into a single and unique reference source. JNO aims to facilitate the dissemination of interdisciplinary research results in the inter-related and converging fields of nanoelectronics and optoelectronics.
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