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

Michitaka Ohtaki, S. Maehara, S. Shige

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    6 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Title of host publicationProceedings ICT 2003 - 22nd International Conference on Thermoelectrics
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Pages171-174
    Number of pages4
    ISBN (Electronic)078038301X
    DOIs
    Publication statusPublished - Jan 1 2003
    Event22nd International Conference on Thermoelectrics, ICT 2003 - La Grande Motte, France
    Duration: Aug 17 2003Aug 21 2003

    Publication series

    NameInternational Conference on Thermoelectrics, ICT, Proceedings
    Volume2003-January

    Other

    Other22nd International Conference on Thermoelectrics, ICT 2003
    CountryFrance
    CityLa Grande Motte
    Period8/17/038/21/03

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    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Electrical and Electronic Engineering

    Cite this

    Ohtaki, M., Maehara, S., & Shige, S. (2003). Thermoelectric properties of Al-doped ZnO sintered with nanosized void forming agents. In Proceedings ICT 2003 - 22nd International Conference on Thermoelectrics (pp. 171-174). [1287476] (International Conference on Thermoelectrics, ICT, Proceedings; Vol. 2003-January). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICT.2003.1287476