Journal of Electronic Materials

, Volume 45, Issue 3, pp 1555–1560 | Cite as

Enhancement of Seebeck Coefficient in Bi Nanowires by Electric Field Effect

  • Takashi Komine
  • Tomosuke Aono
  • Yuta Nabatame
  • Masayuki Murata
  • Yasuhiro Hasegawa
Article

Abstract

In this study, we investigated the electric field effect on the transport properties of a Bi nanowire. These effects were modeled by a surface potential. The electron states of Bi nanowires were numerically analyzed by effective mass equations at the T-point and L-point taking into account surface potential due to an external electric field. The Seebeck coefficients of Bi nanowires were calculated by using the Boltzmann equation with a constant relaxation time. It was found that the Seebeck coefficients increased when the sign of the surface potential parameter was negative. In particular, when the surface potential parameter was \(-\)1 eV and the skin depth was 10 nm in a 20-nm-diameter nanowire, the maximum absolute value of the Seebeck coefficient was larger than 1 mV/K, which was greatly improved compared to that without an external electric field.

Keywords

Transport properties Bi nanowire electric field effect surface potential 

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Copyright information

© The Minerals, Metals & Materials Society 2015

Authors and Affiliations

  • Takashi Komine
    • 1
  • Tomosuke Aono
    • 1
  • Yuta Nabatame
    • 1
  • Masayuki Murata
    • 2
  • Yasuhiro Hasegawa
    • 3
  1. 1.Faculty of EngineeringIbaraki UniversityHitachiJapan
  2. 2.iECO, National Institute of Advanced Industrial Science and Technology (AIST)TsukubaJapan
  3. 3.Faculty of EngineeringSaitama UniversitySakuraJapan

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