Design and optimization of high-performance GeTe-based thermoelectric materials

PhD by Publication


Lyu, Wanyu. 2023. Design and optimization of high-performance GeTe-based thermoelectric materials. PhD by Publication Doctor of Philosophy. University of Southern Queensland. https://doi.org/10.26192/z0141
Title

Design and optimization of high-performance GeTe-based thermoelectric materials

TypePhD by Publication
AuthorsLyu, Wanyu
Supervisor
2. SecondProf Hao Wang
3. ThirdJin Zou
1. FirstProf Zhigang Chen
Institution of OriginUniversity of Southern Queensland
Qualification NameDoctor of Philosophy
Number of Pages117
Year2023
PublisherUniversity of Southern Queensland
Place of PublicationAustralia
Digital Object Identifier (DOI)https://doi.org/10.26192/z0141
Abstract

Thermoelectric materials can achieve a conversion effect between heat energy and electricity. The conversion efficiency of thermoelectric materials is determined by the dimensionless figure of merit (zT), zT= S2σT/κtot, where S, σ, S2σ, and κtot represent the Seebeck coefficient, electrical conductivity, power factor, and total thermal conductivity, respectively. The pristine GeTe has a high σ due to the high carrier concentration (np) induced by intrinsic Ge vacancies. This high np also led to a low S which obtained a relatively low S2σ. Thus, combined with a relatively high κtot, a peak zT value of ~1 was obtained in GeTe. Rare earth elements doping can affect the transport properties of GeTe thermoelectric materials with below advantages, including aliovalent elements doping to reduce np, the localized magnetic moments due to the unfilled 4f-electrons, the large mass fluctuation, and strain-field fluctuation effect on point defect scattering. All these features motivate us to investigate the rare earth elements doped GeTe system for the purpose of reducing the κlat, exploring the effect of doping with local magnetic moment elements on the thermoelectric properties of GeTe. This project is conducted in the following parts: The thermoelectric performance of GeTe-based thermoelectric materials can be significantly enhanced by substituting REs (Eu, Gd, Er, and Tm) at the Ge site of GeTe. The zTave are increased from 0.38 of pristine GeTe to ~ 0.60 of Ge0.98RE0.02Te at the entire temperature range. Lu was found to have a relatively small radius and electronegativity difference with Ge compared with other rare earth elements, which can induce a high doping level in GeTe. A peak zT of 1.75 at 673 K and an average zT of 0.92 within the temperature range of 303-723 K are obtained in Ge0.9Lu0.02Sb0.08Te. Rare earth Nd doping in the TAGS-85 (GeTe85(AgSbTe2)15) system obtained the highest zT values of 1.65 at 727 K. Overall, several breakthroughs in GeTe thermoelectrics have been made and documented in journal papers. The challenges of high-performance n-type GeTe and the practical application of GeTe thermoelectric devices still need to be further investigated.

Keywordsthermoelectric materials; GeTe; rare earth elements; solubility limit; thermal conductivity; carrier concentration
Related Output
Has partRare-Earth Nd Inducing Record-High Thermoelectric Performance of (GeTe)85(AgSbTe2)15
Has partCondensed point defects enhance thermoelectric performance of rare-earth Lu-doped GeTe
Has partThe effect of rare earth element doping on thermoelectric properties of GeTe
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020401605. Functional materials
510406. Structural properties of condensed matter
340204. Inorganic green chemistry
Public Notes

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Byline AffiliationsSchool of Engineering
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