Phase-transition temperature suppression to achieve cubic GeTe and high thermoelectric performance by Bi and Mn codoping

Liu, Zihang; Sun, Jifeng; Mao, Jun; Zhu, Hangtian; Ren, Wuyang; Zhou, Jingchao; Wang, Zhiming; Singh, David J.; Sui, Jiehe; Chu, Ching-Wu; Ren, Zhifeng

doi:10.1073/pnas.1802020115

Title: Phase-transition temperature suppression to achieve cubic GeTe and high thermoelectric performance by Bi and Mn codoping

Journal Article · Mon May 07 00:00:00 EDT 2018 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1802020115· OSTI ID:1438289

Liu, Zihang ^[1]; Sun, Jifeng ^[2]; Mao, Jun ^[3]; Zhu, Hangtian ^[3]; Ren, Wuyang ^[4]; Zhou, Jingchao ^[1]; Wang, Zhiming ^[5]; Singh, David J. ^[2]; Sui, Jiehe ^[6]; Chu, Ching-Wu ^[3]; Ren, Zhifeng ^[3]

State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, 150001 Harbin, China,, Department of Physics, University of Houston, Houston, TX 77204-5005,, Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5002,
Department of Physics and Astronomy, University of Missouri-Columbia, Columbia, MO 65211,
Department of Physics, University of Houston, Houston, TX 77204-5005,, Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5002,
Department of Physics, University of Houston, Houston, TX 77204-5005,, Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5002,, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, 610054 Chengdu, China
Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, 610054 Chengdu, China
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, 150001 Harbin, China,

Germanium telluride (GeTe)-based materials, which display intriguing functionalities, have been intensively studied from both fundamental and technological perspectives. As a thermoelectric material, though, the phase transition in GeTe from a rhombohedral structure to a cubic structure at ~700 K is a major obstacle impeding applications for energy harvesting. In this work, we discovered that the phase-transition temperature can be suppressed to below 300 K by a simple Bi and Mn codoping, resulting in the high performance of cubic GeTe from 300 to 773 K. Bi doping on the Ge site was found to reduce the hole concentration and thus to enhance the thermoelectric properties. Mn alloying on the Ge site simultaneously increased the hole effective mass and the Seebeck coefficient through modification of the valence bands. Here, with the Bi and Mn codoping, the lattice thermal conductivity was also largely reduced due to the strong point-defect scattering for phonons, resulting in a peak thermoelectric figure of merit (ZT) of ~1.5 at 773 K and an average ZT of ~1.1 from 300 to 773 K in cubic Ge_0.81Mn_0.15Bi_0.04Te. Our results open the door for further studies of this exciting material for thermoelectric and other applications.

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Research Organization:: Univ. of Houston, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0010831

OSTI ID:: 1438289

Alternate ID(s):: OSTI ID: 1540288

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Vol. 115 Journal Issue: 21; ISSN 0027-8424

Publisher:: Proceedings of the National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 172 works

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Title: Phase-transition temperature suppression to achieve cubic GeTe and high thermoelectric performance by Bi and Mn codoping

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