Thermoelectric properties of Bi2Te2Se compensated by native defects and Sn doping

M. K. Fuccillo, Shuang Jia, M. E. Charles, R. J. Cava

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

In Bi2Te2Se the defect chemistry involves native defects that compete such that they can either exchange dominance or else significantly compensate each other. Here we show how the net carrier concentration, n - p, which depends on the relative amounts of these defects and is readily obtained from Hall data, can be used as a fundamental materials parameter to describe the varied behavior of the thermoelectric properties as a function of compensation. We report the effects of tuning this parameter over multiple orders of magnitude by hole-doping the n-type material Bi 2Te2Se0.995, which is already significantly compensated because of its Se deficiency. Crystals with different levels of hole doping were achieved by two separate approaches, namely by selecting pieces from different locations in an undoped crystal in which a systematic carrier concentration gradient had been induced by its growth conditions, and alternatively by doping with Sn for Bi. The thermoelectric power factors for Bi2-x Snx Te2Se0.995 for x = 0, 0.002, 0.005, 0.010, and 0.040 are reported, and the dependence of the transport properties on the extent of compensation is discussed.

Original languageEnglish (US)
Pages (from-to)1246-1253
Number of pages8
JournalJournal of Electronic Materials
Volume42
Issue number6
DOIs
StatePublished - Jun 1 2013

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

Keywords

  • Thermoelectrics
  • bismuth telluride selenide
  • defect chemistry
  • doping

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