Temperature dependent band gap in PbX (X = S, Se, Te)

Zachary M. Gibbs, Hyoungchul Kim, Heng Wang, Robert L. White, Fivos Drymiotis, Massoud Kaviany, G. Jeffrey Snyder*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

119 Scopus citations

Abstract

PbTe is an important thermoelectric material for power generation applications due its high conversion efficiency and reliability. Its extraordinary thermoelectric performance is attributed to band convergence of the light L and heavy Σ bands. However, the temperature at which these bands converge is disputed. In this letter, we provide direct experimental evidence combined with ab initio calculations that confirm an increasing optical gap up to 673 K and predict a band convergence temperature of 700 K, much higher than previous measurements showing saturation and band convergence at 450 K.

Original languageEnglish (US)
Article number262109
JournalApplied Physics Letters
Volume103
Issue number26
DOIs
StatePublished - Dec 23 2013

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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