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Giant Thermoelectric Effect in Graded Micro-Nanoporous Materials

Published online by Cambridge University Press:  05 August 2013

Dimitrios G. Niarchos ,
Roland H. Tarkhanyan  and
Alexandra Ioannidou
Dimitrios G. Niarchos*
Affiliation:
Institute for Advanced Materials, Physicochemical Processes, Nanotechnology & Microsystems, Department of Materials Science, NCSR “Demokritos”, Athens, Greece
Roland H. Tarkhanyan
Affiliation:
Institute for Advanced Materials, Physicochemical Processes, Nanotechnology & Microsystems, Department of Materials Science, NCSR “Demokritos”, Athens, Greece
Alexandra Ioannidou
Affiliation:
Institute for Advanced Materials, Physicochemical Processes, Nanotechnology & Microsystems, Department of Materials Science, NCSR “Demokritos”, Athens, Greece
*
*Presenting Author. E-mail: dniarchos@ims.demokritos.gr
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Abstract

In this work we report on opportunities for a colossal reduction in lattice thermal conductivity (LTC) of graded micro-nanoporous structures with inhomogeneous porosity which leads to the considerable improvement in thermoelectric figure of merit ZT. We employ the effective medium theory to calculate the LTC of a porous media with hole pores of variable radius and show that porous materials with inhomogeneous porosity are expected to have stronger reduction (about 30 times!) in thermal conductivity than those with pores of equal sizes. Such a reduction is caused by enhanced scattering of thermal phonons with the pore boundaries. We have studied the variations of the LTC as a function of porosity, pore sizes, geometry and the number of pore groups with different sizes. Our theoretical results show excellent agreement with experimental data.

Keywords

thermoelectricityporositynanostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1543: Symposium H – Nanoscale Thermoelectric Materials, Thermal and Electrical Transport, and Applications to Solid-State Cooling and Power Generation , 2013 , pp. 29 - 38
Copyright
Copyright © Materials Research Society 2013 

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References

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