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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]
+ Show Author Affiliations
  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:
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.
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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
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Williams, Jared B., Mather, Spencer P., Page, Alexander, Uher, Ctirad, and Morelli, Donald T. Wed . "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.
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@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},
journal = {Journal of Applied Physics},
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}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1063/1.4995430
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Citation Metrics:
Cited by: 15 works
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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:

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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

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Understanding the superior thermoelectric performance of Sb precipitated Ge 17 Sb 2 Te 20
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journal, January 2015

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journal, March 2016

Enhanced thermoelectric performance driven by high-temperature phase transition in the phase change material Ge 4 SbTe 5
journal, May 2015

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Increasing Seebeck Coefficients and Thermoelectric Performance of Sn/Sb/Te and Ge/Sb/Te Materials by Cd Doping
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journal, December 2015

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    Works referencing / citing this record:

    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

    • Schwarzmüller, Stefan; Souchay, Daniel; Günther, Daniel
    • Zeitschrift für anorganische und allgemeine Chemie, Vol. 644, Issue 24
    • DOI: 10.1002/zaac.201800453

    Thermoelectric efficiency of graded Si c Ge 1– c alloys
    journal, September 2018

    • Rogolino, P.; Cimmelli, V. A.
    • Journal of Applied Physics, Vol. 124, Issue 9
    • DOI: 10.1063/1.5037883

    Lattice hardening due to vacancy diffusion in (GeTe) m Sb 2 Te 3 alloys
    journal, August 2019

    • Peng, Wanyue; Smiadak, David M.; Boehlert, Michael G.
    • Journal of Applied Physics, Vol. 126, Issue 5
    • DOI: 10.1063/1.5108659
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      Figures / Tables found in this record:

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