Electrical characteristics and detailed interfacial structures of Ag/Ni metallization on polycrystalline thermoelectric SnSe

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SnSe is a promising thermoelectric material with a high figure of merit in single crystal form, which has stimulated continuous research on polycrystalline SnSe. In this study, we investigated a metallization technique for polycrystalline SnSe to achieve highly efficient and practical SnSe thermoelectric modules. The Ag/Ni metallization layers were formed on pristine polycrystalline SnSe using various deposition technique: sputter coating Ni, powder Ni and foil Ni by spark plasma sintering. Structural analysis demonstrated that the microstructure and contact resistance could be different according to the metallization process, despite using the same metals. The Ag/Ni metallization layer using foil Ni acted as an effective diffusion barrier and minimized electrical contact resistance (2.3 × 10-4 Ω·cm2). A power loss in the thermoelectric module of only 5% was demonstrated using finite element simulation.
Publisher
JOURNAL MATER SCI TECHNOL
Issue Date
2019-05
Language
English
Article Type
Article
Citation

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY, v.35, no.5, pp.711 - 718

ISSN
1005-0302
DOI
10.1016/j.jmst.2018.11.020
URI
http://hdl.handle.net/10203/253927
Appears in Collection
EE-Journal Papers(저널논문)
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