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Laser Flash Analysis Determination of the Thermal Diffusivity of Si/SiGe Superlattices

Published online by Cambridge University Press:  18 February 2013

Anthony L. Davidson III ,
James P. Thomas ,
Terrance Worchesky ,
Mark E. Twigg  and
Phillip E. Thompson
Anthony L. Davidson III
Affiliation:
Naval Research Laboratory, 4555 Overlook Ave, Washington DC
James P. Thomas
Affiliation:
Naval Research Laboratory, 4555 Overlook Ave, Washington DC
Terrance Worchesky
Affiliation:
Retiree Naval Research Laboratory, 4555 Overlook Ave, Washington DC
Mark E. Twigg
Affiliation:
Naval Research Laboratory, 4555 Overlook Ave, Washington DC
Phillip E. Thompson
Affiliation:
Retiree Naval Research Laboratory, 4555 Overlook Ave, Washington DC
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Abstract

Applications that produce a large amount of heat, such as combustion engines, can benefit from high temperature thermoelectrics to reduce the amount of energy lost. Superlattice (SL) structures have shown reduced thermal conductivity at room temperature and below, suggesting applicability at high temperatures may be possible. This reduction could greatly increase the thermoelectric figure of merit. The Si/SiGe material system is studied here for high temperature application. Two growth temperatures of 300 C and 500 C are examined. Two superlattice periods were studied (8 nm and 20 nm) to determine the effects of lattice spacing on thermal conductivity. Laser Flash Analysis is applied to determine the thermal diffusivity, hence thermal conductivity, from 100 C to 500 C. Thermal diffusivity was found to be an order of magnitude lower than the constituent alloy at 100 C. Superlattice spacing and growth temperature showed little effect on the diffusivity within the error of this measurement.

Keywords

thermal conductivitythermoelectricthin film
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1490: Symposium B – Thermoelectric Materials Research and Device Development for Power Conversion and Refrigeration , 2013 , pp. 45 - 50
Copyright
Copyright © Materials Research Society 2013 

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References

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