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

研究成果: Article

3 引用 (Scopus)

抄録

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.

元の言語English
ページ(範囲)1616-1621
ページ数6
ジャーナルJournal of Nanoscience and Nanotechnology
17
発行部数3
DOI
出版物ステータスPublished - 2017 3 1
外部発表Yes

ASJC Scopus subject areas

  • Medicine(all)

これを引用

Mele, P., Saini, S., Tiwari, A., Hopkins, P. E., Miyazaki, K., Ichinose, A., ... 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

Thermoelectric and structural characterization of Al-doped ZnO/Y2O3 multilayers. / Mele, Paolo; Saini, S.; Tiwari, A.; Hopkins, P. E.; Miyazaki, K.; Ichinose, A.; Niemelä, J.; Karppinen, M.

:: Journal of Nanoscience and Nanotechnology, 巻 17, 番号 3, 01.03.2017, p. 1616-1621.

研究成果: Article

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

AU - Ichinose, A.

AU - Niemelä, J.

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AB - 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.

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