期刊
NANOMATERIALS
卷 10, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/nano10112270
关键词
skutterudite; thermoelectric; atomic layer deposition; ZnO; SnO2
类别
资金
- Technology Innovation Program through the Korea Evaluation Institute of Industrial Technology (KEIT) - Ministry of Trade, Industry and Energy (MOTIE), Republic of Korea [10083640]
- Korea Institute for Advancement of Technology (KIAT) - Korea Government (MOTIE) [P0012451]
- Korea Institute of Ceramic Engineering and Technology [KPP19001]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10083640] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Ministry of Health & Welfare (MOHW), Republic of Korea [P0012451] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Nanostructuring is considered one of the key approaches to achieve highly efficient thermoelectric alloys by reducing thermal conductivity. In this study, we investigated the effect of oxide (ZnO and SnO2) nanolayers at the grain boundaries of polycrystalline In0.2Yb0.1Co4Sb12 skutterudites on their electrical and thermal transport properties. Skutterudite powders with oxide nanolayers were prepared by atomic layer deposition method, and the number of deposition cycles was varied to control the coating thickness. The coated powders were consolidated by spark plasma sintering. With increasing number of deposition cycle, the electrical conductivity gradually decreased, while the Seebeck coefficient changed insignificantly; this indicates that the carrier mobility decreased due to the oxide nanolayers. In contrast, the lattice thermal conductivity increased with an increase in the number of deposition cycles, demonstrating the reduction in phonon scattering by grain boundaries owing to the oxide nanolayers. Thus, we could easily control the thermoelectric properties of skutterudite materials through adjusting the oxide nanolayer by atomic layer deposition method.
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