Heat–Electric Power Conversion Without Temperature Difference Using Only n-Type Ba8AuxSi46−x Clathrate with Au Compositional Gradient

Yuki Osakabe, Shota Tatsumi, Yuichi Kotsubo, Junpei Iwanaga, Keita Yamasoto, Shinji Munetoh, Osamu Furukimi, Kunihiko Nakashima

    研究成果: ジャーナルへの寄稿学術誌査読

    3 被引用数 (Scopus)

    抄録

    Thermoelectric power generation is typically based on the Seebeck effect under a temperature gradient. However, the heat flux generated by the temperature difference results in low conversion efficiency. Recently, we developed a heat–electric power conversion mechanism using a material consisting of a wide-bandgap n-type semiconductor, a narrow-bandgap intrinsic semiconductor, and a wide-bandgap p-type semiconductor. In this paper, we propose a heat–electric power conversion mechanism in the absence of a temperature difference using only n-type Ba8AuxSi46−x clathrate. Single-crystal Ba8AuxSi46−x clathrate with a Au compositional gradient was synthesized by Czochralski method. Based on the results of wavelength-dispersive x-ray spectroscopy and Seebeck coefficient measurements, the presence of a Au compositional gradient in the sample was confirmed. It also observed that the electrical properties changed gradually from wide-bandgap n-type to narrow-bandgap n-type. When the sample was heated in the absence of a temperature difference, the voltage generated was approximately 0.28 mV at 500°C. These results suggest that only an n-type semiconductor with a controlled bandgap can generate electric power in the absence of a temperature difference.

    本文言語英語
    ページ(範囲)3273-3276
    ページ数4
    ジャーナルJournal of Electronic Materials
    47
    6
    DOI
    出版ステータス出版済み - 6月 1 2018

    !!!All Science Journal Classification (ASJC) codes

    • 電子材料、光学材料、および磁性材料
    • 凝縮系物理学
    • 電子工学および電気工学
    • 材料化学

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