NDLI: Electrical Resistivity and Seebeck Coefficient of Segmented Thermoelements

Content Provider	IEEE Xplore Digital Library
Author	Sharp, J. Gilbert, P. Thompson, A.
Copyright Year	2006
Description	Author affiliation: Marlow Industries, Inc., Dallas, TX (Sharp, J.; Gilbert, P.; Thompson, A.)
Abstract	To enhance efficiency while maintaining device simplicity, wafers of different thermoelectric materials are sometimes joined to form segmented thermoelements. Properly designed segmented thermoelements provide a high average ZT by matching materials to the temperature profile along the thermoelement length. One possible penalty of segmentation is reduction of ZT by interfacial effects, such as contact resistance or reaction zones. Interfacial effects will become increasingly important as the wafers are made thinner, but thinner wafers are more economical. We are making segmented thermoelements for an U.S. Department of Energy waste heat recovery program. The thermoelements contain one to three segments of common power generation materials, and they are 0.5 to 2 mm thick. Here we present measurements of the electrical resistivity and Seebeck coefficient of PbTe and n-type $Bi_{2}Te_{3}$ alloy samples designed to highlight interfacial effects. For 1 mm thick wafers, we do not see significant contact resistance. There is insufficient data at this point to assess if the effective Seebeck coefficient is thickness-dependent
Starting Page	29
Ending Page	32
File Size	461483
Page Count	4
File Format	PDF
ISBN	1424408105
ISSN	10942734
DOI	10.1109/ICT.2006.331262
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-08-06
Publisher Place	Austria
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electric resistance Contact resistance Power generation economics Thermoelectricity Thermoelectric devices Joining materials Temperature Power system economics Heat recovery Waste heat
Content Type	Text
Resource Type	Article

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