Highly efficient (In2Te3)x(GeTe) 3-3x thermoelectric materials: A substitute for TAGS

Hui Sun, Xu Lu, Hang Chi, Donald T. Morelli, Ctirad Uher

Research output: Contribution to journalArticle

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Abstract

GeTe is a versatile base compound to produce highly efficient p-type thermoelectric materials such as the TAGS materials (AgSbTe2) 1-x(GeTe)x and GeTe-PbTe nanocomposites. The pure GeTe composition shows a very high power factor, ∼42 μW cm-1 K -2, between 673 K and 823 K, which is among the highest power factors that have ever been reported in this temperature range. However, its relatively high thermal conductivity limits the dimensionless figure of merit ZT to values of only unity. In this paper, we present an efficient approach to reduce the thermal conductivity by preparing (In2Te3) x(GeTe)3-3x solid solutions. In spite of a slight degradation of the electronic properties, the drastic reduction of the thermal conductivity due to a synergistic combination of reduced electronic thermal conductivity, strong alloy scattering, and vacancy phonon scattering leads to ZT values as high as 1.35 at 823 K for the x = 0.05 sample. Our results show that (In2Te3)x(GeTe)3-3x is a prospective substitute for TAGS as a p-leg element for high-temperature power generation. This journal is

LanguageEnglish (US)
Pages15570-15575
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume16
Issue number29
DOIs
StatePublished - Aug 7 2014

Profile

thermoelectric materials
Thermal conductivity
thermal conductivity
substitutes
Phonon scattering
scattering
electronics
figure of merit
Electronic properties
Vacancies
Power generation
unity
Solid solutions
Nanocomposites
nanocomposites
solid solutions
Scattering
degradation
Degradation
Temperature

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Physics and Astronomy(all)

Cite this

Highly efficient (In2Te3)x(GeTe) 3-3x thermoelectric materials : A substitute for TAGS. / Sun, Hui; Lu, Xu; Chi, Hang; Morelli, Donald T.; Uher, Ctirad.

In: Physical Chemistry Chemical Physics, Vol. 16, No. 29, 07.08.2014, p. 15570-15575.

Research output: Contribution to journalArticle

Sun, Hui ; Lu, Xu ; Chi, Hang ; Morelli, Donald T. ; Uher, Ctirad. / Highly efficient (In2Te3)x(GeTe) 3-3x thermoelectric materials : A substitute for TAGS. In: Physical Chemistry Chemical Physics. 2014 ; Vol. 16, No. 29. pp. 15570-15575
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