Thermal diffusion barrier metallization based on Co-Mo powder-mixed composites for n-type skutterudite ((Mm,Sm)(y)Co4Sb12) thermoelectric devices

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The thermal stability of the interfaces between metal electrodes and thermoelectric (TE) materials is a significant factor for determining the reliability of intermediate temperature (300-800 degrees C) TE devices (TEDs). The interfacial cracks and elemental inter-diffusion cause power degradation of TEDs. To enhance TE device reliability, metallization layers should be inserted between electrodes and TE material. Metallization layers act as a diffusion barrier by suppressing elemental inter-diffusion and a stress damper by matching coefficient of thermal expansion (CTE). In this paper, we introduce a Co0.6Mo0.4 metallization layer for n-type skutterudite (SKD-N). The Co0.6Mo0.4 metallization layer inhibited the elemental inter-diffusion to less than similar to 10 mu m, and the electrical specific contact resistance (SCR) remained within the range of similar to 10(-6) Omega cm(2) after thermal aging, which shows that the Co0.6Mo0.4 metallization layer has excellent interface reliability compared to a Ti metallization layer. These results demonstrate that the Co0.6Mo0.4 composite is a promising candidate as a metallization layer for the fabrication of highly reliable TEDs. (C) 2019 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2020-03
Language
English
Article Type
Article
Citation

JOURNAL OF ALLOYS AND COMPOUNDS, v.818

ISSN
0925-8388
DOI
10.1016/j.jallcom.2019.152917
URI
http://hdl.handle.net/10203/271614
Appears in Collection
EE-Journal Papers(저널논문)
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