We present a parametric modeling of the thermoelectric transport coefficients based on a model previously used to interpret experimental measurements on the conductivity, σ, and Seebeck coefficient, S, in highly Boron-doped polycrystalline Si, where a very significant thermoelectric power factor (TPF) enhancement was observed. We have derived analytical formalism for the transport coefficients in the presence of an energy barrier assuming thermionic emission over the barrier for (i) non-degenerate and (ii) degenerate one-band semiconductor. Simple generic parametric equations are found that are in agreement with the exact Boltzmann transport formalism in a wide range of parameters. Moreover, we explore the effect of energy barriers in 1-d composite semiconductors in the presence of two phases: (a) the bulk-like phase and (b) the barrier phase. It is pointed out that significant TPF enhancement can be achieved in the composite structure of two phases with different thermal conductivities. The TPF enhancement is estimated as a function of temperature, the Fermi energy position, the type of scattering, and the barrier height. The derived modeling provides guidance for experiments and device design.

Zianni, X., Narducci, D. (2015). Parametric modeling of energy filtering by energy barriers in thermoelectric nanocomposites. JOURNAL OF APPLIED PHYSICS, 117(3) [10.1063/1.4905674].

Parametric modeling of energy filtering by energy barriers in thermoelectric nanocomposites

NARDUCCI, DARIO
Ultimo
2015

Abstract

We present a parametric modeling of the thermoelectric transport coefficients based on a model previously used to interpret experimental measurements on the conductivity, σ, and Seebeck coefficient, S, in highly Boron-doped polycrystalline Si, where a very significant thermoelectric power factor (TPF) enhancement was observed. We have derived analytical formalism for the transport coefficients in the presence of an energy barrier assuming thermionic emission over the barrier for (i) non-degenerate and (ii) degenerate one-band semiconductor. Simple generic parametric equations are found that are in agreement with the exact Boltzmann transport formalism in a wide range of parameters. Moreover, we explore the effect of energy barriers in 1-d composite semiconductors in the presence of two phases: (a) the bulk-like phase and (b) the barrier phase. It is pointed out that significant TPF enhancement can be achieved in the composite structure of two phases with different thermal conductivities. The TPF enhancement is estimated as a function of temperature, the Fermi energy position, the type of scattering, and the barrier height. The derived modeling provides guidance for experiments and device design.
Articolo in rivista - Articolo scientifico
Electric power factor; Energy barriers; Thermionic emission; Thermoelectric power, Boltzmann transport; Energy filtering; Parametric equation; Parametric modeling; Polycrystalline-Si; Thermoelectric power factors; Thermoelectric transport; Transport coefficient, Thermal conductivity;
English
Zianni, X., Narducci, D. (2015). Parametric modeling of energy filtering by energy barriers in thermoelectric nanocomposites. JOURNAL OF APPLIED PHYSICS, 117(3) [10.1063/1.4905674].
Zianni, X; Narducci, D
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/97293
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