Thermoelectric Structured Systems with Nanophonic Metamaterials

LYUDMILA BIKOVA, NINA JELYABOVSKAYA, VLADIMIR SHUKHTIN, VLADIMIR ULASYUK

Abstract


This work is aimed at analysis of methods for the developing of new thermoelectric systems including those based on the so-called locally resonant "nanophonic" metamaterials. These materials, with their experimental realization, are intended for use in thermoelectric systems, since they have a large value of the thermoelectric Q-factor ZT. The increase in Q is achieved by reducing the thermal conductivity of the material, which leads to an increase in the value of ZT, if the electrical conductivity remains the same. The reduction in thermal conductivity, without corresponding reduction in electrical conductivity, is achieved by choosing a configuration of thermoelectric materials consisting of a thin film with a periodic set of columns mounted on a free surface. Such a configuration qualitatively changes the base phonon spectrum of a thin film due to the hybridization mechanism between local column resonances and underlying lattice scattering. Numerical methods are used to study changes in the phonon spectrum and, as a consequence, a change (decrease) in the value of thermal conductivity depending on variations in the system architecture.

Keywords


Thermoelectric systems, Nanophonic metamaterials, Thermal conductivity, Electrical conductivity, Cooling devices, Phonon spectrum.Text


DOI
10.12783/dteees/peems2019/33965

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