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

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.4995430· OSTI ID:1397217
 [1]; ORCiD logo [1];  [2];  [2];  [1]
  1. Michigan State Univ., East Lansing, MI (United States)
  2. Univ. of Michigan, Ann Arbor, MI (United States)
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Here, 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.

Research Organization:
Energy Frontier Research Centers (EFRC), Washington, D.C. (United States). Revolutionary Materials for Solid State Energy Conversion (RMSSEC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001054
OSTI ID:
1397217
Alternate ID(s):
OSTI ID: 1372715
Journal Information:
Journal of Applied Physics, Vol. 122, Issue 4; Related Information: RMSSEC partners with Michigan State University (lead); University of California, Los Angeles; University of Michigan; Northwestern University; Oak Ridge National Laboratory; Ohio State University; Wayne State University; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

References (19)

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Origin of the Optical Contrast in Phase-Change Materials journal June 2007
Band structure engineering through orbital interaction for enhanced thermoelectric power factor journal February 2014
Reduction of thermal conductivity through nanostructuring enhances the thermoelectric figure of merit in Ge 1−x Bi x Te journal January 2016
Using Ge Secondary Phases to Enhance the Power Factor and Figure of Merit of Ge17Sb2Te20 journal August 2016
(GeTe) x -(Sb 2 Te 3 ) 1- x phase-change thin films as potential thermoelectric materials journal September 2012
Ueber die Wärme-Leitungsfähigkeit der Metalle journal January 1853
Understanding the superior thermoelectric performance of Sb precipitated Ge 17 Sb 2 Te 20 journal January 2016
Resonant bonding leads to low lattice thermal conductivity journal April 2014
Real Structure and Thermoelectric Properties of GeTe-Rich Germanium Antimony Tellurides journal October 2011
Enhanced thermoelectric performance of GeTe-rich germanium antimony tellurides through the control of composition and structure journal January 2015
Heterostructures of skutterudites and germanium antimony tellurides – structure analysis and thermoelectric properties of bulk samples journal January 2015
Structure of covalently bonded materials: From the Peierls distortion to Phase-Change Materials journal March 2016
Enhanced thermoelectric performance driven by high-temperature phase transition in the phase change material Ge 4 SbTe 5 journal May 2015
Increasing Seebeck Coefficients and Thermoelectric Performance of Sn/Sb/Te and Ge/Sb/Te Materials by Cd Doping journal October 2015
The influence of Mn doping on the properties of Ge4Sb2Te7 journal December 2015
High Thermoelectric Figure of Merit Values of Germanium Antimony Tellurides with Kinetically Stable Cobalt Germanide Precipitates journal September 2015

Cited By (4)

Boosting the Thermoelectric Performance of Pseudo-Layered Sb 2 Te 3 (GeTe) n via Vacancy Engineering journal October 2018
Argyrodite-Type Cu 8 GeSe 6- x Te x (0 ≤ x ≤ 2): Temperature-Dependent Crystal Structure and Thermoelectric Properties : Argyrodite-Type Cu journal November 2018
Thermoelectric efficiency of graded Si c Ge 1– c alloys journal September 2018
Lattice hardening due to vacancy diffusion in (GeTe) m Sb 2 Te 3 alloys journal August 2019

Figures / Tables (11)

FIG. 1(p. 3)figure FIG. 1
FIG. 2(p. 4)figure FIG. 2
FIG. 3(p. 4)figure FIG. 3
FIG. 4(p. 5)figure FIG. 4
FIG. 5(p. 5)figure FIG. 5
FIG. 6(p. 5)figure FIG. 6
FIG. 7(p. 5)figure FIG. 7
FIG. 8(p. 6)figure FIG. 8
FIG. 9(p. 6)figure FIG. 9
FIG. 10(p. 7)figure FIG. 10
TABLE I(p. 7)table TABLE I

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