Methodology of Thermoelectric Power Factor Enhancement by Controlling Nanowire Interface

Takafumi Ishibe, Atsuki Tomeda, Kentaro Watanabe, Yoshinari Kamakura, Nobuya Mori, Nobuyasu Naruse, Yutaka Mera, Yuichiro Yamashita, Yoshiaki Nakamura

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The simultaneous realization of low thermal conductivity and high thermoelectric power factor in materials has long been the goal for the social use of high-performance thermoelectric modules. Nanostructuring approaches have drawn considerable attention because of the success in reducing thermal conductivity. On the contrary, enhancement of the thermoelectric power factor, namely, the simultaneous increase of the Seebeck coefficient and electrical conductivity, has been difficult. We propose a method for the power factor enhancement by introducing coherent homoepitaxial interfaces with controlled dopant concentration, which enables the quasiballistic transmission of high-energy carriers. The wavenumber of the high-energy carriers is nearly conserved through the interfaces, resulting in simultaneous realization of a high Seebeck coefficient and relatively high electrical mobility. Here, we experimentally demonstrate the dopant-controlled epitaxial interface effect for the thermoelectric power factor enhancement using our "embedded-ZnO nanowire structure" having high-quality nanowire interfaces. This presents the methodology for substantial power factor enhancement by interface carrier scattering.

Original languageEnglish
Pages (from-to)37709-37716
Number of pages8
JournalACS Applied Materials and Interfaces
Volume10
Issue number43
DOIs
Publication statusPublished - 2018 Oct 31
Externally publishedYes

Keywords

  • ZnO
  • carrier transport
  • nanowire
  • phonon
  • thermoelectric material
  • thermoelectric power factor

ASJC Scopus subject areas

  • Materials Science(all)

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  • Cite this

    Ishibe, T., Tomeda, A., Watanabe, K., Kamakura, Y., Mori, N., Naruse, N., Mera, Y., Yamashita, Y., & Nakamura, Y. (2018). Methodology of Thermoelectric Power Factor Enhancement by Controlling Nanowire Interface. ACS Applied Materials and Interfaces, 10(43), 37709-37716. https://doi.org/10.1021/acsami.8b13528