Effects of Ge-Doping on Thermoelectric Performance of Polycrystalline Cubic Sn<sub>0.5</sub>Ag<sub>0.25</sub>Bi<sub>0.25</sub>Se<sub>0.50</sub>Te<sub>0.50</sub>

Effects of Ge-Doping on Thermoelectric Performance of Polycrystalline Cubic Sn<sub>0.5</sub>Ag<sub>0.25</sub>Bi<sub>0.25</sub>Se<sub>0.50</sub>Te<sub>0.50</sub>

Cubic phase SnSe-based materials have great potential in the field of thermoelectricity due to their reduced carrier scattering, increased band degeneracy, and ultra-low lattice thermal conductivity. Nevertheless, systematic studies on the influence of element doping on the thermoelectric properties...

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Bibliographic Details
Main Authors: Haoyu Zhao, Junliang Zhu, Zhonghe Zhu, Lin Bo, Wenying Wang, Xingshuo Liu, Changcun Li, Degang Zhao
Format: Article
Language:English
Published: MDPI AG 2025-07-01
Series:Crystals
Subjects:
thermoelectric material
Sn<sub>0.5</sub>Ag<sub>0.25</sub>Bi<sub>0.25</sub>Se<sub>0.50</sub>Te<sub>0.50</sub>
cubic phase
Ge doping
<i>ZT</i> value
Online Access:https://www.mdpi.com/2073-4352/15/7/622
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Summary:Cubic phase SnSe-based materials have great potential in the field of thermoelectricity due to their reduced carrier scattering, increased band degeneracy, and ultra-low lattice thermal conductivity. Nevertheless, systematic studies on the influence of element doping on the thermoelectric properties of cubic SnSe-based materials are still relatively scarce. To enrich the research in this field, this work investigates the effects of Ge doping on the phase composition, electrical and thermal transport properties of cubic Sn<sub>0.50</sub>Ag<sub>0.25</sub>Bi<sub>0.25</sub>Se<sub>0.50</sub>Te<sub>0.50</sub> thermoelectric materials. X-ray diffraction (XRD) analysis confirmed that the Ge-doped samples exhibited a single cubic phase structure, while scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) revealed a uniform distribution of elements within the samples. The results indicate that increasing the Ge doping content substantially enhances their electrical conductivity, albeit at the expense of elevated thermal conductivity. By optimizing the content of Ge-doping, the thermoelectric figure of merit (<i>ZT</i>) reached 0.74 at 750 K. Notably, while moderate Ge doping enhances electrical transport properties, excessive doping leads to a significant rise in thermal conductivity, ultimately constraining further thermoelectric performance gains.
ISSN:2073-4352

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