Increasing the thermoelectric power factor of Ge17Sb2Te20 by adjusting the Ge/Sb ratio

Jared B. Williams, Spencer P. Mather, Alexander Page, Ctirad Uher, Donald T. Morelli

Research output: Contribution to journalArticle

Abstract

We have investigated the thermoelectric properties of Ge17Sb2Te20. This compound is a known phase change material with electronic properties that depend strongly on temperature. The thermoelectric properties of this compound can be tuned by altering the stoichiometry of Ge and Sb without the use of additional foreign elements during synthesis. This tuning results in a 26% increase in the thermoelectric power factor at 723 K. Based on a single parabolic band model we show that the pristine material is optimally doped, and thus, a reduction in the lattice thermal conductivity of pure Ge17Sb2Te20 should result in an enhanced thermoelectric figure of merit.

Original languageEnglish (US)
Article number045105
JournalJournal of Applied Physics
Volume122
Issue number4
DOIs
StatePublished - Jul 28 2017

Profile

phase change materials
figure of merit
stoichiometry
thermal conductivity
adjusting
tuning
synthesis
electronics
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Increasing the thermoelectric power factor of Ge17Sb2Te20 by adjusting the Ge/Sb ratio. / Williams, Jared B.; Mather, Spencer P.; Page, Alexander; Uher, Ctirad; Morelli, Donald T.

In: Journal of Applied Physics, Vol. 122, No. 4, 045105, 28.07.2017.

Research output: Contribution to journalArticle

Williams, Jared B.; Mather, Spencer P.; Page, Alexander; Uher, Ctirad; Morelli, Donald T. / Increasing the thermoelectric power factor of Ge17Sb2Te20 by adjusting the Ge/Sb ratio.

In: Journal of Applied Physics, Vol. 122, No. 4, 045105, 28.07.2017.

Research output: Contribution to journalArticle

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