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Thermoelectric Properties of ZnO Ceramics Co-Doped with Al and Transition Metals

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The effect of co-doping with transition metals (Fe, Ni, and Sm) on the thermoelectric properties of Al-doped ZnO (AZO) ceramics was studied. The electrical conductivity σ of AZO was significantly (12%) increased by Ni co-doping, while an unfavorable deterioration in σ was observed for Fe- or Sm-co-doped AZO. Hall-effect measurements indicated that the electron mobility of AZO decreased due to co-doping in all samples. Only the Ni-co-doped AZO sample showed significant enhancement in electron density, resulting in its black color. The thermal conductivity κ decreased drastically due to Ni or Sm co-doping of AZO, while only a small change was observed for Fe co-doping of AZO. The κ value at 1073 K for Ni-co-doped AZO was 77% of that for AZO. A dimensionless figure of merit ZT = 0.126 was attained at 1073 K for Ni-co-doped AZO, representing an improvement over that of conventional AZO by a factor of 1.50.

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Authors and Affiliations

  1. Department of Electronics and Information Systems, Akita Prefectural University, 84-4 Tsuchiya-Ebinokuchi, Yurihonjo, Akita, 015-0055, Japan

    Hiroyuki Yamaguchi, Yasunori Chonan, Manabu Oda, Takao Komiyama & Takashi Aoyama

  2. Akita Research and Development Center, 4-11 Arayamachi-Sanuki, Akita, Akita, 010-1623, Japan

    Shigeaki Sugiyama

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  1. Hiroyuki Yamaguchi
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  2. Yasunori Chonan
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  3. Manabu Oda
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  4. Takao Komiyama
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  5. Takashi Aoyama
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  6. Shigeaki Sugiyama
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Correspondence to Hiroyuki Yamaguchi.

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Yamaguchi, H., Chonan, Y., Oda, M. et al. Thermoelectric Properties of ZnO Ceramics Co-Doped with Al and Transition Metals. J. Electron. Mater. 40, 723–727 (2011). https://doi.org/10.1007/s11664-011-1529-9

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  • DOI: https://doi.org/10.1007/s11664-011-1529-9

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