Melt-spun Sn1−−Sb Mn Te with unique multiscale microstructures approaching exceptional average thermoelectric zT

Yan, Xiangmei; Zheng, Sikang; Zhou, Zhan; Wu, Hong; Zhang, Bin; Huang, Yi‐Chin; Lu, Xu; Han, Guang; Wang, Guoyu; Zhou, Xiaoyuan

doi:10.1016/j.nanoen.2021.105879

Cited by 48 publications

(35 citation statements)

References 61 publications

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“…For instance, Ming et al found that phase transition from order to disorder could affect the electronic transport properties in In-doped Cu 2 SnSe 2.7 S 0.3 . For the decrease in κ l , the basic route is to strengthen the phonon scattering including intrinsic phonon–phonon interactions and extrinsic scattering involving defect engineering and microstructure control. − Pei et al found that the Cu 2 SnSe 4 with intrinsic vacancies exhibits a suppressed thermal conductivity (0.6 W m –1 K –1 at 700 K) close to the glass limit predicted by the Cahill model, which is much lower than the Cu 2 SnZnSe 4 and Cu 2 SnCdSe 4 without intrinsic vacancies . Zhang et al successfully reduced the lattice thermal conductivity of Cu 5 FeS 4 to 0.29 W m –1 K –1 (710 K) through twin engineering and achieved a peak zT of 0.62 at 710 K …”

Section: Introductionmentioning

confidence: 97%

Phase Composition Manipulation and Twin Boundary Engineering Lead to Enhanced Thermoelectric Performance of Cu₂SnS₃

Wei

Zhou

Jiang

et al. 2021

ACS Appl. Energy Mater.

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Cu2SnS3 (CTS), a typical ternary copper-based sulfide, is considered as a potential p-type thermoelectric (TE) material with the advantages of environmental friendliness and low cost, but its performance is limited by the high lattice thermal conductivity and electrical resistivity. Herein, we have successfully synthesized undoped and In-doped CTS nanoparticles with a pure tetragonal phase by the colloidal method. More interestingly, plenty of twin boundaries appear in all the samples sintered from the synthesized nanoparticles independent of composition. The twin boundaries can effectively reduce the lattice thermal conductivity, while the tetragonal phase is beneficial to meliorate the electrical performance of CTS. Consequently, the highest zT reaches 0.36 at 700 K for Cu2Sn0.85In0.15S3, which is enhanced by 17 times compared to that of the pristine CTS with mainly the monoclinic phase. The tunable phase and microstructure via the colloidal method provide useful guidance to promote the performance of eco-friendly TE sulfides.

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Section: Introductionmentioning

confidence: 97%

Phase Composition Manipulation and Twin Boundary Engineering Lead to Enhanced Thermoelectric Performance of Cu₂SnS₃

Wei

Zhou

Jiang

et al. 2021

ACS Appl. Energy Mater.

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“…We first synthesized (details can be found in the Supporting Information) a series of Sb 2 Te 3 -alloyed SnTe samples, namely, (SnTe) n Sb 2 Te 3 (n = 40,25,20,15,12,10,8), and presented powder X-ray diffraction (XRD) patterns in Figure 1a. It seems that all samples exhibit the single-phase rock salt structure without any impurities.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Unfortunately, the complex correlation among S , σ, and κ e via carrier concentration, as well as the interrelation between carrier mobility and lattice thermal conductivity via intrinsic and extrinsic microstructures, makes it difficult to improve the thermoelectric performance through tuning a single parameter independently. To date, various strategies including carrier concentration optimization, − valence band convergence, − introducing resonant levels, , energy filtering, and modulation doping , are proved to improve the power factor, while reduced lattice thermal conductivity can be achieved via introducing point defects, − planar defect, , nanoprecipitates, − lattice softening, − and all-scale hierarchical architectures. − …”

Section: Introductionmentioning

confidence: 99%

Synergy of Valence Band Modulation and Grain Boundary Engineering Leading to Improved Thermoelectric Performance in SnTe

Wang¹,

Yu²,

He³

et al. 2021

ACS Appl. Energy Mater.

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SnTe is a lead-free and promising p-type thermoelectric material in an intermediate temperature range (500−900 K), but its intrinsic performance is poor due to excess cation vacancies and relatively large band offset between L and ∑ valence bands. In this study, we alloyed Sb 2 Te 3 into the SnTe matrix and successfully promoted the valence band convergence as supported by the calculated two-band Pisarenko curve; we further doped excess Mg and obtained a significantly reduced lattice thermal conductivity ∼0.44 W m −1 K −1 at 623 K. Scanning transmission electron microscopy (STEM) reveals that a large amount of Mgrich nanoprecipitates concentrate at SnTe grain boundaries and stay coherent with the SnTe lattice, which is believed to be responsible for the large reduction of lattice thermal conductivity. Through the synergetic effects of valence band modulation and grain boundary engineering, a decent ZT max of ∼1.14 at 723 K and an impressively large ZT avg of ∼0.67 (323−773 K) were achieved simultaneously in the (Sn 0.95 Mg 0.05 Te) 10 Sb 2 Te 3 sample.

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“…However, these parameters are coupling with each other, so elevating zT becomes a tough task. To date, a number of strategies have been applied to optimize the electrical and thermal transport properties in order to achieve enhanced zT . − In terms of material systems, metal tellurides, such as Bi 2 Te 3 , and PbTe, are the main commercialized materials. However, the limited reserve of Te on the Earth and the toxicity of component Pb restrict their applications in thermoelectrics.…”

Section: Introductionmentioning

confidence: 99%

Phase Tuning for Enhancing the Thermoelectric Performance of Solution-Synthesized Cu_2–xS

Yang

Liu

Zhang

et al. 2021

ACS Appl. Mater. Interfaces

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Cu 2 S, consisting of Earth-abundant and eco-friendly elements, is a promising candidate for thermoelectric energy conversion. The stoichiometric Cu 2 S has intrinsically low thermal conductivity together with meagre electrical conductivity. Herein, in order to improve the electrical properties, we develop a facile solvothermal method for synthesizing a series of Cu 2−x S with tunable phase compositions. With reduction in the CuCl/Na 2 S molar ratio in the solution precursors from 2:1 to 1.75:1, the solvothermal products transform from single-phase Cu 2 S into Cu 2 S−Cu 1.96 S composites, which are preserved in the hot-pressed pellets. The decreased CuCl/Na 2 S molar ratio results in increased room-temperature Hall carrier concentration, leading to enhanced electrical conductivity. Specifically, the pellet corresponding to the 1.75:1 CuCl/Na 2 S precursor ratio obtains a power factor of 8.04 μW cm −1 K −2 at 815 K, which is ∼735% of the value obtained by stoichiometric Cu 2 S. Along with the moderate thermal conductivity, this sample achieves an enhanced zT value of 0.87 at 815 K, representing a ∼250% increase when compared to stoichiometric Cu 2 S. This study demonstrates an effective strategy in enhancing the thermoelectric performance of solutionsynthesized Cu 2 S-based materials by phase tuning.

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Melt-spun Sn1−−Sb Mn Te with unique multiscale microstructures approaching exceptional average thermoelectric zT

Cited by 48 publications

References 61 publications

Phase Composition Manipulation and Twin Boundary Engineering Lead to Enhanced Thermoelectric Performance of Cu₂SnS₃

Phase Composition Manipulation and Twin Boundary Engineering Lead to Enhanced Thermoelectric Performance of Cu₂SnS₃

Synergy of Valence Band Modulation and Grain Boundary Engineering Leading to Improved Thermoelectric Performance in SnTe

Phase Tuning for Enhancing the Thermoelectric Performance of Solution-Synthesized Cu_2–xS

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Melt-spun Sn1−−Sb Mn Te with unique multiscale microstructures approaching exceptional average thermoelectric zT

Cited by 48 publications

References 61 publications

Phase Composition Manipulation and Twin Boundary Engineering Lead to Enhanced Thermoelectric Performance of Cu2SnS3

Phase Composition Manipulation and Twin Boundary Engineering Lead to Enhanced Thermoelectric Performance of Cu2SnS3

Synergy of Valence Band Modulation and Grain Boundary Engineering Leading to Improved Thermoelectric Performance in SnTe

Phase Tuning for Enhancing the Thermoelectric Performance of Solution-Synthesized Cu2–xS

Contact Info

Product

Resources

About

Phase Composition Manipulation and Twin Boundary Engineering Lead to Enhanced Thermoelectric Performance of Cu₂SnS₃

Phase Composition Manipulation and Twin Boundary Engineering Lead to Enhanced Thermoelectric Performance of Cu₂SnS₃

Phase Tuning for Enhancing the Thermoelectric Performance of Solution-Synthesized Cu_2–xS