Optimization of Thermoelectric Performance of Graphene Nanoribbons by Controlling Nano Structure

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  • IZAWA Tetsumi
    Department of Electrical Engineering, Tokyo University of Science
  • TAKASHIMA Kengo
    Department of Electrical Engineering, Tokyo University of Science
  • YAMAMOTO Takahiro
    Department of Electrical Engineering, Tokyo University of Science Department of Liberal Arts, Tokyo University of Science

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Other Title
  • ナノ構造制御によるグラフェンナノリボンの熱電性能の最適化
  • ナノ コウゾウ セイギョ ニ ヨル グラフェンナノリボン ノ ネツデンセイノウ ノ サイテキ カ

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Abstract

<p>Effects of edge disorder on thermoelectric performance of graphene nanoribbons (GNRs) were investigated through computational simulations based on the non-equilibrium Green's function method combined with the tight-binding approximation. We found that the thermoelectric power factor PF can be optimized by adjusting the ribbon length, L, of GNRs with edge disorder concentration Cd. For example, at room temperature, PF of zigzag-edged GNRs at the Fermi energy shows a maximum value of 33 mW/(m K2) when Cd = 10% and L = 210 nm. Both the maximum PF and optimum L decrease with increasing Cd. The maximum PF is theoretically explained in terms of the crossover from the ballistic transport regime to the Anderson's localization regime.</p>

Journal

  • Hyomen Kagaku

    Hyomen Kagaku 37 (8), 348-353, 2016

    The Surface Science Society of Japan

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