Thermopower enhancement in Pb1-xMnxTe alloys and its effect on thermoelectric efficiency

Yanzhong Pei*, Heng Wang, Zachary M. Gibbs, Aaron D. LaLonde, Jeffrey G. Snyder

*Corresponding author for this work

Research output: Contribution to journalArticle

163 Scopus citations

Abstract

The Seebeck coefficient of p-type PbTe can be enhanced at 300 K, either due to the addition of Tl-resonant states or by manipulation of the multiple valence bands by alloying with isovalent compounds, such as MgTe. PbTe alloyed with MnTe shows a similar thermopower enhancement that could be due to either mechanism. Here we investigate the characteristics that distinguish the resonant state mechanism from that due to multiple valence bands and their effect on the thermoelectric figure of merit, zT. Ultimately, we find that the transport properties of PbTe alloyed with MnTe can be explained by alloy scattering and multiple band model that result in a zT as high as 1.6 at 700 K, and additionally a B30% enhancement of the average zT.

Original languageEnglish (US)
Article numbere28
JournalNPG Asia Materials
Volume4
Issue number9
DOIs
StatePublished - Sep 1 2012

Keywords

  • Band engineering
  • Resonant states
  • Thermoelectric

ASJC Scopus subject areas

  • Modeling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

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