Crystal structure, electronic structure and thermoelectric properties of n-type BiSbSTe 2

Sima Aminorroaya-Yamini*, Chao Zhang, Xiaolin Wang, Ivan Nevirkovets

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

N-type bismuth telluride sulfide has received attention as a potential thermoelectric material due to its large thermopower and ability to form solid solutions with bismuth antimony sulfide. Here, we fabricated an n-type tetradymite BiSbSTe 2 by solid-state reaction. The crystal structure was found to be rhombohedral, and the thermoelectric properties were measured for the temperature range 50-390K. A high Seebeck coefficient of 190νVK -1 was achieved at 385K. The electronic structure of BiSbSTe 2 was investigated using first-principles calculations and compared with its parent counterpart (Bi 2STe 2). The results have shown that BiSbSTe 2 is a narrow band-gap semiconductor. For the first time, we have demonstrated that the vacancies in substitutional atomic sites, which can be altered through different fabrication techniques, can determine the charge carrier nature of tetradymite thermoelectrics. As a proof of concept, we have shown that the vacancies in antimony sites result in a p-type compound while a sulfur deficiency produces an n-type phase with lower electrical conductivity.

Original languageEnglish (US)
Article number125301
JournalJournal of Physics D: Applied Physics
Volume45
Issue number12
DOIs
StatePublished - Mar 28 2012
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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