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Title: Increasing the thermoelectric power factor of Ge 17Sb 2Te 20 by adjusting the Ge/Sb ratio

Here, we have investigated the thermoelectric properties of Ge 17Sb 2Te 20. 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 Ge 17Sb 2Te 20 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:
Grant/Contract Number:
SC0001054
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)
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) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1397217
Alternate Identifier(s):
OSTI ID: 1372715

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., 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. doi: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. doi: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},
journal = {Journal of Applied Physics},
number = 4,
volume = 122,
place = {United States},
year = {2017},
month = {7}
}