High thermoelectric performance of dually doped ZnO ceramics

Michitaka Ohtaki, Kazuhiko Araki, Kiyoshi Yamamoto

    研究成果: ジャーナルへの寄稿記事

    250 引用 (Scopus)

    抄録

    A marked improvement in the thermoelectric performance of dense ZnO ceramics is achieved by employing a third element as a co-dopant with Al. Dual doping of ZnO with Al and Ga results in a drastic decrease in the thermal conductivity of the oxide, while the decrease in the electrical conductivity is relatively small. With the aid of a significant enhancement in the thermopower, the dually doped oxide shows thermoelectric figure of merit values, ZT, values of 0.47 at 1000 K and 0.65 at 1247 K at the composition Zn 0.96Al 0.02Ga 0.02O. These results appear to be the highest ZT values so far reported for bulk n-type oxides. Microscopic observation of the samples reveals a granular texture in the densely sintered oxide matrix, suggesting that considerable reduction of the thermal conductivity while maintaining high electrical conductivity could be achieved by such a bulk nanocomposite structure in the samples.

    元の言語英語
    ページ(範囲)1234-1238
    ページ数5
    ジャーナルJournal of Electronic Materials
    38
    発行部数7
    DOI
    出版物ステータス出版済み - 7 1 2009

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    Oxides
    ceramics
    oxides
    Thermal conductivity
    thermal conductivity
    Doping (additives)
    electrical resistivity
    Thermoelectric power
    figure of merit
    Chemical elements
    Nanocomposites
    nanocomposites
    textures
    Textures
    augmentation
    matrices
    Chemical analysis
    Electric Conductivity

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Electrical and Electronic Engineering
    • Materials Chemistry

    これを引用

    High thermoelectric performance of dually doped ZnO ceramics. / Ohtaki, Michitaka; Araki, Kazuhiko; Yamamoto, Kiyoshi.

    :: Journal of Electronic Materials, 巻 38, 番号 7, 01.07.2009, p. 1234-1238.

    研究成果: ジャーナルへの寄稿記事

    Ohtaki, Michitaka ; Araki, Kazuhiko ; Yamamoto, Kiyoshi. / High thermoelectric performance of dually doped ZnO ceramics. :: Journal of Electronic Materials. 2009 ; 巻 38, 番号 7. pp. 1234-1238.
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