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

Abstract

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.

Authors:
 [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)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC), Washington, D.C. (United States). Revolutionary Materials for Solid State Energy Conversion (RMSSEC)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1397217
Alternate Identifier(s):
OSTI ID: 1372715
Grant/Contract Number:  
SC0001054
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 122; Journal 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; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Williams, Jared B., Mather, Spencer P., Page, Alexander, Uher, Ctirad, and Morelli, Donald T. Increasing the thermoelectric power factor of Ge17Sb2Te20 by adjusting the Ge/Sb ratio. United States: N. p., 2017. Web. doi:10.1063/1.4995430.
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. United States. https://doi.org/10.1063/1.4995430
Williams, Jared B., Mather, Spencer P., Page, Alexander, Uher, Ctirad, and Morelli, Donald T. 2017. "Increasing the thermoelectric power factor of Ge17Sb2Te20 by adjusting the Ge/Sb ratio". United States. https://doi.org/10.1063/1.4995430. https://www.osti.gov/servlets/purl/1397217.
@article{osti_1397217,
title = {Increasing the thermoelectric power factor of Ge17Sb2Te20 by adjusting the Ge/Sb ratio},
author = {Williams, Jared B. and Mather, Spencer P. and Page, Alexander and Uher, Ctirad and Morelli, Donald T.},
abstractNote = {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.},
doi = {10.1063/1.4995430},
url = {https://www.osti.gov/biblio/1397217}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 4,
volume = 122,
place = {United States},
year = {Wed Jul 26 00:00:00 EDT 2017},
month = {Wed Jul 26 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

Figures / Tables:

FIG. 1 FIG. 1: X-ray diffraction patterns for Ge17+xSb2-xTe20, with the diffraction pattern of GeTe for reference in red. Peak splitting begins for some of the peaks for x = 0.16, which is due to a changing rhombohedral angle away from 60º, or the rocksalt phase.

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Works referenced in this record:

Resonant bonding in crystalline phase-change materials
journal, July 2008


The origin of incipient ferroelectricity in lead telluride
journal, July 2016


High Thermoelectric Performance and Enhanced Mechanical Stability of p -type Ge 1– x Sb x Te
journal, October 2015


Origin of the Optical Contrast in Phase-Change Materials
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Band structure engineering through orbital interaction for enhanced thermoelectric power factor
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Reduction of thermal conductivity through nanostructuring enhances the thermoelectric figure of merit in Ge 1−x Bi x Te
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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
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Understanding the superior thermoelectric performance of Sb precipitated Ge 17 Sb 2 Te 20
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Resonant bonding leads to low lattice thermal conductivity
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Heterostructures of skutterudites and germanium antimony tellurides – structure analysis and thermoelectric properties of bulk samples
journal, January 2015


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


Works referencing / citing this record:

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