Thermoelectric Transport in a ZrN-ScN SuperlatticeReport as inadecuate

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Journal of Electronic Materials

, Volume 38, Issue 7, pp 960–963

First Online: 19 January 2009Received: 08 July 2008Accepted: 17 December 2008


Metal-semiconductor superlattices have the potential for a high thermoelectric figure of merit. The thermopower of these structures can be enhanced by controlling the barrier height using high-energy electron filtering. In addition, phonon scattering at interfaces can reduce the lattice contribution to the thermal conductivity. In this paper, we present theoretical and experimental studies of the thermoelectric transport in ZrN-ScN metal-semiconductor superlattices. Preliminary measurement results show an exponential increase in the cross-plane electrical conductivity with increasing temperature, which indicates the presence of the barrier. Fit of the Boltzmann transport-based model with the data indicates a barrier height of 280 meV. The cross-plane Seebeck coefficient of the sample is also measured by combining Seebeck voltage transient measurements with the thermal imaging technique. A Seebeck coefficient of 820 μV-K at room temperature is extracted, which is in good agreement with the simulation result of 800 μV-K. Theoretical calculations predict that the ZrN-ScN structure can exhibit a ZT of 1.5 at 1300 K assuming lateral momentum is conserved and that a ZT of 3 is achievable if the lateral momentum is not conserved.

KeywordsThermoelectrics metal-semiconductor interface  Download to read the full article text

Author: Mona Zebarjadi - Zhixi Bian - Rajeev Singh - Ali Shakouri - Robert Wortman - Vijay Rawat - Tim Sands


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