Simultaneous Enhancement of Electrical Conductivity and Thermopower of Bi2Te3 by Multifunctionality of Native Defects

Joonki Suh, Kin Man Yu, Deyi Fu, Xinyu Liu, Fan Yang, Jin Fan, David Smith, Yong-Hang Zhang, Jacek K. Furdyna, Chris Dames, Wladyslaw Walukiewicz, Junqiao Wu

Research output: Contribution to journalArticle

52 Scopus citations

Abstract

Simultaneous increases in electrical conductivity (up to 200%) and thermopower (up to 70%) are demonstrated by introducing native defects in Bi2Te3 films, leading to a high power factor of 3.4 × 10-3 W m-1 K-2. The maximum enhancement of the power factor occurs when the native defects act beneficially both as electron donors and energy filters to mobile electrons. They also act as effective phonon scatterers.

Original languageEnglish (US)
Pages (from-to)3681-3686
Number of pages6
JournalAdvanced Materials
Volume27
Issue number24
DOIs
StatePublished - Jun 1 2015

Keywords

  • BiTe
  • defect engineering
  • native point defects
  • particle irradiation
  • thermoelectric properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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    Suh, J., Yu, K. M., Fu, D., Liu, X., Yang, F., Fan, J., Smith, D., Zhang, Y-H., Furdyna, J. K., Dames, C., Walukiewicz, W., & Wu, J. (2015). Simultaneous Enhancement of Electrical Conductivity and Thermopower of Bi2Te3 by Multifunctionality of Native Defects. Advanced Materials, 27(24), 3681-3686. https://doi.org/10.1002/adma.201501350