Synergistic optimization of carrier transport and thermal conductivity in Sn-doped Cu<sub>2</sub>Te

Qiu, Yuchong; Liu, Ying; Ye, Jinwen; Li, Jun; Lian, Lixian

doi:10.1039/c8ta04993a

Cited by 31 publications

(18 citation statements)

References 47 publications

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“…Additionally, dynamic cation disorder decreases lattice thermal conductivity, and an impressive zT ∼ 1.6 at 670 K was obtained in Se doped AgCuTe [52]. Similarly, Sn doping has been used to tune the high hole concentration of Cu 2 Te and zT ∼ 1.5 has been achieved at 1000 K [53]. A mosaic crystal of Cu 2 (Te,S) has also been reported with zT ∼ 2.09 at 1000 K [54].…”

Section: Transition Metal (Tm) Telluridesmentioning

confidence: 95%

Key properties of inorganic thermoelectric materials—tables (version 1)

et al. 2022

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This paper presents tables of key thermoelectric properties, which define thermoelectric conversion efficiency, for a wide range of inorganic materials. The 12 families of materials included in these tables are primarily selected on the basis of well established, internationally-recognised performance and their promise for current and future applications: Tellurides, Skutterudites, Half Heuslers, Zintls, Mg-Sb Antimonides, Clathrates, FeGa3–type materials, Actinides and Lanthanides, Oxides, Sulfides, Selenides, Silicides, Borides and Carbides. As thermoelectric properties vary with temperature, data are presented at room temperature to enable ready comparison, and also at a higher temperature appropriate to peak performance. An individual table of data and commentary are provided for each family of materials plus source references for all the data.

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Section: Transition Metal (Tm) Telluridesmentioning

confidence: 95%

Key properties of inorganic thermoelectric materials—tables (version 1)

et al. 2022

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“…In recent years, various strategies have been proposed to enhance the ZT values of materials, such as band engineering, − nanostructure engineering, nano-composite structures, − secondary-phase incorporation, − and the “phonon-glass electron-crystal” (PGEC) paradigm . Among these approaches, the PGEC is a very effective and popular approach to enhance TE properties of materials, which could reduce the lattice thermal conductivity by enhancing phonon scattering without sacrificing electronic transport properties.…”

Section: Introductionmentioning

confidence: 99%

Synergetic Optimization of Electrical and Thermal Transport Properties by Cu Vacancies and Nanopores in Cu₂Se

Zhao

Ning

et al. 2021

ACS Appl. Mater. Interfaces

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In this study, a series of Cu2+x–y In y Se (−0.3 ≤ x ≤ 0.2 and 0 ≤ y ≤ 0.05) samples were prepared by melting and the spark plasma sintering method. X-ray diffraction measurements indicate that the Cu-deficient samples (x = −0.3 y = 0 and x = −0.2 y = 0) prefer to form the cubic phase (β-Cu2Se). Adding excessive Cu or introducing In atoms into the Cu2Se matrix triggers a phase transition from the β to α phase. Positron lifetime measurements confirm the reduction in Cu vacancy concentration by adding excessive Cu or introducing In atoms into Cu2Se, which causes a dramatic decrease in carrier concentration from 1.59 × 1021 to 5.0 × 1019 cm–3 at room temperature. The samples with In contents of 0.01 and 0.03 show a high power factor of about 1 mW m–1 K–2 at room temperature due to the optimization of the carrier concentration. Meanwhile, the excess Cu content and doping of In atoms also favor the formation of nanopores. These pores have strong interaction with phonons, leading to remarkable reduction in lattice thermal conductivity. Finally, a high ZT value of about 1.44 is achieved at 873 K in the Cu1.99In0.01Se (x = 0 and y = 0.01) sample, which is about twice that of the Cu-deficient sample (Cu1.7Se). Our work provides a viable insight into tuning vacancy defects to improve efficiently the electrical and thermal transport performance for copper-based thermoelectric materials.

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“…The carrier mobility in Cu 2 Te was found to be ∼50−100 cm 2 V −1 s −2 which is greater than those in Cu 2 S (<10 cm 2 V −1 s −2 ) and Cu 2 Se (∼20−40 cm 2 V −1 s −2 ) in the temperature range 50− 300 K. 21 Copper telluride is represented with simple molecular formula Cu 2−x Te, but it shows a quite complex atomic arrangement and forms different phases such as CuTe, Cu 2−x Te, and Cu 2 Te. 33,27,34 The compound has vast technological applications such as solar cells 25,28,6 and fast switches and TE generators; 2,21,26 however, the existence of a variety of polymorphic forms and phases of copper telluride makes understanding of the fundamental properties, such as crystal structure, electronic band structure, phonon dispersion, and phonon−phonon interactions, challenging and thus they remain unexplored. Further, CT also shows a structural phase transition with temperature.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Recently, superionic Cu 2– x X (X = S, Se) are reported to have ultralow κ and high zT due to the liquid-like behavior of Cu ions around the crystalline sublattice of X and are considered as a new class of phonon–liquid–electron–crystals (PLEC). − ,,− ,,, Further, the superionic CT2 has an interesting structure where the tellurium atom forms a rigid sublattice and the liquid-like Cu ions are distributed randomly in the rigid sublattice and thus classified as PLEC . It has been observed that several state of the art TE materials are tellurides, such as PbTe, SnTe, ,, and Bi 2 Te 3 , , and have better performances than their Se and S counterparts. ,, Thus, the present work focuses on the Raman spectroscopic studies of copper tellurides.…”

Section: Introductionmentioning

confidence: 99%

Raman Spectroscopy Study of Phonon Liquid Electron Crystal in Copper Deficient Superionic Thermoelectric Cu_2–xTe

Pandey

Mukherjee

Rawat

et al. 2020

ACS Appl. Energy Mater.

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Superionic Cu 2-x Te (CT) is an interesting and emerging p-type thermoelectric (TE) material due to the existence of various polymorphic phases and crystal structures, which undergo several structural phase transitions. On the basis of the stoichiometry of the CT compounds, the structure parameters, the carrier concentration (n p ), and the thermal conductivity (κ) can be modulated for optimum TE performance. Further, the understanding of the fundamental properties and their impact on TE parameters is not well understood because of their complex structures. We have investigated the vibrational properties of CT compounds such as Cu 1.25 Te (CT1.25), Cu 1.6 Te (CT1.6), and Cu 2 Te (CT2) using temperature dependent Raman studies in the temperature range of 300−773 K. Several structural phases are probed through remarkably distinct spectra for the CT compounds. The temperature transitions are complex such as (i) eutectic melting into CuTe and Te for both CT1.6 (above ∼593 K) and CT1.25 (above ∼613 K) and (ii) the structural transition from trigonal to orthorhombic and cubic phase for CT2 (above ∼553 K), which are strongly manifested in the Raman study. Further, the role of n p in the Raman spectra has also been investigated. The intensity of the Raman modes (>100 cm −1 ) showed strong n p dependence due to strong plasmon−phonon coupling. The analysis of full width at half-maximum (fwhm) of Raman peaks and qualitative estimation of phonon lifetime (τ i ) showed that CT2 has the minimum lattice thermal conductivity.

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Synergistic optimization of carrier transport and thermal conductivity in Sn-doped Cu₂Te

Cited by 31 publications

References 47 publications

Key properties of inorganic thermoelectric materials—tables (version 1)

Key properties of inorganic thermoelectric materials—tables (version 1)

Synergetic Optimization of Electrical and Thermal Transport Properties by Cu Vacancies and Nanopores in Cu₂Se

Raman Spectroscopy Study of Phonon Liquid Electron Crystal in Copper Deficient Superionic Thermoelectric Cu_2–xTe

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Synergistic optimization of carrier transport and thermal conductivity in Sn-doped Cu2Te

Cited by 31 publications

References 47 publications

Key properties of inorganic thermoelectric materials—tables (version 1)

Key properties of inorganic thermoelectric materials—tables (version 1)

Synergetic Optimization of Electrical and Thermal Transport Properties by Cu Vacancies and Nanopores in Cu2Se

Raman Spectroscopy Study of Phonon Liquid Electron Crystal in Copper Deficient Superionic Thermoelectric Cu2–xTe

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Synergistic optimization of carrier transport and thermal conductivity in Sn-doped Cu₂Te

Synergetic Optimization of Electrical and Thermal Transport Properties by Cu Vacancies and Nanopores in Cu₂Se

Raman Spectroscopy Study of Phonon Liquid Electron Crystal in Copper Deficient Superionic Thermoelectric Cu_2–xTe