Rational design, two-step synthesis of Cu2GeS3 crystal with enhanced thermoelectric performance by Te alloying

Hu, Zeqing; Xu, Huihong; Lin, Yangjian; Liu, Yu; Xu, Junsheng; Li, Zhou; Song, Ji‐Ming

doi:10.1007/s10854-022-08488-z

Cited by 2 publications

(2 citation statements)

References 28 publications

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“…1b reveal the presence of five broad peaks located at 313, 324, 339, 366 and 390 cm −1 , which could be confirmed to stem from the vibrational modes of the Cu 2 GeS 3 nanostructures, as reported in the literature. 30,31 In order to confirm whether the constituent elements were homogeneously distributed in the material, 2-D elemental mapping was performed, which confirmed the uniform distribution of the constituent elements within the nanostructures (ESI,† Fig. S2).…”

Section: Resultsmentioning

confidence: 99%

A facile synthetic route toward phase-pure colloidal Cu₂GeS₃ nanostructures mediated through metal xanthate precursors

et al. 2022

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Section: Resultsmentioning

confidence: 99%

A facile synthetic route toward phase-pure colloidal Cu₂GeS₃ nanostructures mediated through metal xanthate precursors

et al. 2022

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“…The Cu 2 GeCh 3 analogues could be divided into two groups, I and II. Group I reveals the κ L values dominantly suppressed by point defects, such as doping heterogeneous elements, introducing deficient or excess cations, alloying sulfur, etc . Group II claims its low κ L closely associated with the bond anharmonicity .…”

Section: Resultsmentioning

confidence: 99%

Enhanced Thermoelectric Performance and Low Thermal Conductivity in Cu₂GeTe₃ with Identified Localized Symmetry Breakdown

Qin

Zhu

et al. 2023

Inorg. Chem.

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Highly efficient and eco-friendly thermoelectric generators rely on low-cost and nontoxic semiconductors with high symmetry and ultralow lattice thermal conductivity κL. We report the rational synthesis of the novel cubic (Ag, Se)-doped Cu2GeTe3 semiconductors. A localized symmetry breakdown (LSB) was found in the composition of Cu1.9Ag0.1GeTe1.5Se1.5 (i.e., CAGTS15) with an ultralow κL of 0.37 W/mK at 723 K, the lowest value outperforming all Cu2GeCh3 (Ch = S, Se, and Te). A joint investigation of synchrotron X-ray techniques identifies the LSB embedded into the cubic CAGTS15 host matrix. This LSB is an Ångström-scale orthorhombic symmetry unit, characteristic of multiple bond lengths, large anisotropic atomic displacements, and distinct local chemical coordination of anions. Computational results highlight that such an unusual orthorhombic symmetry demonstrates low-frequency phonon modes, which become softer and more predominant with increasing temperatures. This unconventional LSB promotes bond complexity and phonon scattering, highly beneficial for extraordinarily low lattice thermal conductivity.

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Rational design, two-step synthesis of Cu2GeS3 crystal with enhanced thermoelectric performance by Te alloying

Cited by 2 publications

References 28 publications

A facile synthetic route toward phase-pure colloidal Cu₂GeS₃ nanostructures mediated through metal xanthate precursors

A facile synthetic route toward phase-pure colloidal Cu₂GeS₃ nanostructures mediated through metal xanthate precursors

Enhanced Thermoelectric Performance and Low Thermal Conductivity in Cu₂GeTe₃ with Identified Localized Symmetry Breakdown

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Rational design, two-step synthesis of Cu2GeS3 crystal with enhanced thermoelectric performance by Te alloying

Cited by 2 publications

References 28 publications

A facile synthetic route toward phase-pure colloidal Cu2GeS3 nanostructures mediated through metal xanthate precursors

A facile synthetic route toward phase-pure colloidal Cu2GeS3 nanostructures mediated through metal xanthate precursors

Enhanced Thermoelectric Performance and Low Thermal Conductivity in Cu2GeTe3 with Identified Localized Symmetry Breakdown

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A facile synthetic route toward phase-pure colloidal Cu₂GeS₃ nanostructures mediated through metal xanthate precursors

A facile synthetic route toward phase-pure colloidal Cu₂GeS₃ nanostructures mediated through metal xanthate precursors

Enhanced Thermoelectric Performance and Low Thermal Conductivity in Cu₂GeTe₃ with Identified Localized Symmetry Breakdown