Thermoelectric and structural characterization of Al-doped ZnO/Y2O3 multilayers

Paolo Mele, S. Saini, A. Tiwari, P. E. Hopkins, K. Miyazaki, A. Ichinose, J. Niemelä, M. Karppinen

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The influence of Y2O3 nanolayers on thermoelectric performance and structure of 2% Al-doped ZnO (AZO) thin films has been studied. Multilayers based on five 50 nm thick AZO layers alternated with few nanometers thick Y2O3 layers were prepared by pulsed laser deposition on Al2O3 single crystals by alternate ablation of AZO target and Y2O3 target. The number of laser shots on Y2O3 target was maintained very low (5, 10 and 15 pulses in three separate experiments. The main phase (AZO) presents polycrystalline orientation and typical columnar growth not affected by the presence of Y2O3 nanolayers. The multilayer with 15 laser shots of Y2O3 showed best thermoelectric performance with electrical conductivity σ = 48 S/cm and Seebeck coefficient S = -82 μV/K, which estimate power factor (S2·σ) about 0.03 × 10-3 W m-1 K-2 at 600 K. The value of thermal conductivity (κ) was found 10.03 W m-1 K-1 at 300 K, which is one third of typical value previously reported for bulk AZO. The figure of merit, ZT = S2·σ·T/κ, is calculated 9.6 × 10-4 at 600 K. These results demonstrated the feasibility of nanoengineered defects insertion for the depression of thermal conductivity.

Original languageEnglish
Pages (from-to)1616-1621
Number of pages6
JournalJournal of Nanoscience and Nanotechnology
Volume17
Issue number3
DOIs
Publication statusPublished - 2017 Mar 1
Externally publishedYes

Keywords

  • Phonon scattering
  • Thermal conductivity
  • ZnO multilayers

ASJC Scopus subject areas

  • Medicine(all)

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  • Cite this

    Mele, P., Saini, S., Tiwari, A., Hopkins, P. E., Miyazaki, K., Ichinose, A., Niemelä, J., & Karppinen, M. (2017). Thermoelectric and structural characterization of Al-doped ZnO/Y2O3 multilayers. Journal of Nanoscience and Nanotechnology, 17(3), 1616-1621. https://doi.org/10.1166/jnn.2017.13717