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

Williams, Jared B.; Mather, Spencer P.; Page, Alexander; Uher, Ctirad; Morelli, Donald T.

doi:10.1063/1.4995430

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

Journal Article · 26 July 2017 · Journal of Applied Physics

DOI: https://doi.org/10.1063/1.4995430 · OSTI ID:1397217

Williams, Jared B. ^[1];

^[1]; Page, Alexander ^[2]; Uher, Ctirad ^[2]; Morelli, Donald T. ^[1]

Michigan State Univ., East Lansing, MI (United States)
Univ. of Michigan, Ann Arbor, MI (United States)

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.

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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); USDOE

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

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Cited by: 15 works

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Lattice hardening due to vacancy diffusion in (GeTe) _m Sb ₂ Te ₃ alloys Peng, Wanyue; Smiadak, David M.; Boehlert, Michael G. Journal of Applied Physics, Vol. 126, Issue 5 https://doi.org/10.1063/1.5108659	journal	August 2019