Thermoelectric properties of Al-doped ZnO sintered with nanosized void forming agents

M. Ohtaki, S. Maehara, S. Shige

    研究成果: Chapter in Book/Report/Conference proceedingConference contribution

    6 被引用数 (Scopus)

    抄録

    Reported are the electrical and thermal transport properties of Al-doped zinc oxide sintered in the presence of void forming agents (VFA) such as small carbon or organic polymer particles of several hundreds nanometers in size. Nanosized cavities (nanovoids) thus formed within dense oxide matrices lead to a marked enhancement in the thermopower, showing a large negative maxima at the temperature range around 400-600°C. On the other hand, the formation of the nanovoids scarcely influences the electrical conductivity, if the size of VFA is sufficiently small. Although the reduction of the thermal conductivity is also fairly small, the enhanced thermopower coupled with the virtually unchanged electrical conductivity results in a considerable improvement in the power factor with the maximum value of 40×10-4 W/mK2, being twice as large as that of the completely dense sample without addition of VFA. The ZT value thereby exceeds 0.4, and the operation temperature range markedly expands toward the lower temperatures. Different behavior of the scattering cross sections for electrons and phonons will be discussed.

    本文言語英語
    ホスト出版物のタイトルProceedings ICT 2003 - 22nd International Conference on Thermoelectrics
    出版社Institute of Electrical and Electronics Engineers Inc.
    ページ171-174
    ページ数4
    ISBN(電子版)078038301X
    DOI
    出版ステータス出版済み - 2003
    イベント22nd International Conference on Thermoelectrics, ICT 2003 - La Grande Motte, フランス
    継続期間: 8 17 20038 21 2003

    出版物シリーズ

    名前International Conference on Thermoelectrics, ICT, Proceedings
    2003-January

    その他

    その他22nd International Conference on Thermoelectrics, ICT 2003
    国/地域フランス
    CityLa Grande Motte
    Period8/17/038/21/03

    All Science Journal Classification (ASJC) codes

    • 凝縮系物理学
    • 電子工学および電気工学

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