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Article
Chemistry, Multidisciplinary
Yu-Ke Zhu et al.
Summary: Thermoelectric refrigeration is a mature technique for cooling applications, with the advantage of miniaturization. This study examines the effects of liquid phase hot deformation and traditional hot forging methods on the thermoelectric and mechanical properties of n-type Bi2Te3 alloys. The hot forging method improves both performance and mechanical properties, paving the way for commercial micro-refrigeration applications.
Article
Chemistry, Multidisciplinary
Yuan Yu et al.
Summary: Doping is the first step in tailoring thermoelectrics, allowing precise control of charge-carrier concentration. Alloying with Ag-V-VI2 compounds, rather than elemental doping, significantly enhances thermoelectric performance, which is closely related to a transition in the bonding mechanism.
ADVANCED MATERIALS
(2023)
Article
Multidisciplinary Sciences
Riga Wu et al.
Summary: Grain boundaries (GBs) are important for controlling mass, heat, and charge transport. The scattering of charge carriers at GBs is found to depend on the misorientation angle, with low-angle GBs experiencing disruption of metavalent bonding (MVB) at dislocation cores and high-angle GBs completely destroying MVB due to Peierls distortion. The collapse of MVB leads to an enlargement of the GB barrier height, affecting charge transport.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Leah Borgsmiller et al.
Summary: Yb10MgSb9 is a new Zintl compound that shows promise as a thermoelectric material. Undoped Yb10MgSb9 has a low thermal conductivity and high Seebeck coefficient and electrical resistivity. Doping with Na improves the electrical conductivity and thermoelectric performance, elevating the figure of merit, zT, from 0.23 to 1.06 at 873K. This makes Na-doped Yb10MgSb9 a leading p-type Zintl thermoelectric material for high-temperature applications.
ADVANCED ENERGY MATERIALS
(2023)
Article
Multidisciplinary Sciences
Meng Jiang et al.
Summary: Thermoelectric modules based on Mg3Sb2 alloys are developed, utilizing both n-type and p-type materials, with similar thermomechanical properties for easy module fabrication and low thermal stress. By adopting a suitable diffusion barrier layer and new joining technique, an integrated all-Mg3Sb2-based module achieves a high efficiency of 7.5% at a temperature difference of 380 K, surpassing existing same-parent thermoelectric modules. The stability and reliability of the module are demonstrated through 150 thermal cycling shocks, providing a new perspective for efficient electricity generation from low-grade waste heat.
NATIONAL SCIENCE REVIEW
(2023)
Article
Materials Science, Multidisciplinary
Ming Liu et al.
Summary: This research shows that lattice strain can be used to adjust the defect concentration and optimize the electrical transport performance. Theoretical calculations demonstrate that lattice strain can effectively increase the formation energy of Ge vacancies, reducing carrier scattering and improving carrier mobility. Experimental results confirm that lattice strain obtained through high-energy ball milling combined with spark plasma sintering can reduce the concentration of Ge vacancies, leading to high carrier mobility. Additionally, carefully modulating the nominal content of Ge in Ge0.90Sb0.08Te alloy results in a high ZT of 2.0 at 723 K.
Article
Chemistry, Multidisciplinary
Zhongxin Liang et al.
Summary: Devices based on Bi2Te3 have been dominant in the thermoelectric cooling market, but their narrow operating temperature range and high cost limit their applications. The recently developed Mg3Sb2-based compounds offer excellent transport properties across a wide temperature range, low material costs, and non-toxicity. By regulating carrier concentration, carrier mobility, and lattice thermal conductivity, the thermoelectric performance of p-type Mg3Sb2 is significantly improved, allowing for the construction of a reliable and low-cost all-Mg3Sb2-based thermoelectric device.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Matthias Wuttig et al.
Summary: This article reviews the utilization of quantum chemical bonding descriptors in designing materials with tailored properties and their application in quantitatively describing bonding and its transition in chalcogenides. These descriptors can also predict material properties, including optical and transport properties. They can be used to tailor the properties of chalcogenides relevant for thermoelectrics, photovoltaics, and phase-change memories. The article also discusses a class of materials characterized by unconventional properties attributed to a novel bonding mechanism called metavalent. Promising research directions exploring property changes upon changing bonding mechanism and extending the concept of quantum chemical property predictors to more complex compounds are outlined in the conclusion.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Andrew P. Justl et al.
Summary: Synthetic organic chemists often use retrosynthetic approach and named reactions to target complex molecules, while complex inorganic compounds can be synthesized through simple mechanochemical reactions of the elements. However, complex phases involving multiple elements can lead to competing phases, which may impact the desired properties. This study elucidates the reaction pathway from the elements to the formation of the complex ternary phase Yb14AlSb11 through quenching experiments, and synthesizes high-purity Yb14MnSb11 and Yb14MgSb11 through stoichiometric reactions.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
Jiawei Yang et al.
Summary: Full-scale cooling modules based on optimized materials have been successfully fabricated, with a higher performance-cost ratio, paving the way for next-generation thermoelectric cooling applications.
Article
Materials Science, Multidisciplinary
Xinzhi Wu et al.
Summary: This study proposes an alloying approach to generate thermoelectric interface materials (TEiMs) for improved reliability of thermoelectric power generators (TEGs). Through careful selection of matrix elements and optimization of interface design strategies, ternary alloys with excellent performance and thermal stability were obtained.
Article
Chemistry, Multidisciplinary
Muchun Guo et al.
Summary: Substantial progress has been made in improving the thermoelectric performance of CaMg2Bi2-based materials. This study reveals the effect of intrinsic Bi impurity on the transport properties and demonstrates that the Bi-rich environment associated with Bi impurities can increase the carrier concentration and enhance the figure-of-merit (ZT). Additionally, doping Ba and Yb on the Ca Site aligns the orbitals and enhances phonon scattering, leading to further optimization of electrical and thermal transportation.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Zeliang Sun et al.
Summary: EuMnSb2, a magnetoelectric material, exhibits a greatly enhanced thermoelectric effect by utilizing the spin degree of freedom. The thermopower increases with decreasing temperature at zero field, but rapidly decreases when cooled towards the antiferromagnetic ordering temperature. These findings open up new avenues for improving thermoelectric performance and searching for better thermoelectric materials.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Asish K. Kundu et al.
Summary: In this study, the electronic structure of YbMg2Bi2 and CaMg2Bi2 materials was investigated in detail. The experimental results show that CaMg2Bi2 material has significantly smaller Fermi surface and Fermi velocity, and the Yb-4f states in YbMg2Bi2 material have negligible impact on transport properties. The calculations reveal that both materials belong to the Z(2) topological class.
NPJ QUANTUM MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yuqi Liu et al.
Summary: Alloying SnTe with AgSbTe2 significantly enhances the solubility of Ag, leading to improved electronic band structure tuning effects.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Ming Liu et al.
Summary: This study successfully suppresses the ferroelectric phase transition temperature of GeTe to below room temperature through LiSbTe2 alloying. The research finds that LiSbTe2 alloying can enhance multi-band convergence and phonon scattering, resulting in improved thermoelectric performance in GeTe alloys.
CELL REPORTS PHYSICAL SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Pingjun Ying et al.
Summary: The development of a tellurium-free compound for thermoelectric technology applications around room temperature is of great significance due to the toxicity and scarcity of tellurium. The research team has successfully developed a tellurium-free compound for near-room-temperature applications and achieved higher efficiency through process and doping optimizations.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Qingtang Zhang et al.
Summary: The codoping of In and Cu in GeTe results in ultralow lattice thermal conductivity and high thermoelectric performance due to the increased Seebeck coefficient and carrier mobility. The introduction of Cu2Te nanocrystals and a high density of dislocations lead to strong phonon scattering, significantly reducing lattice thermal conductivity. This phonon engineering approach results in a ZT of 2.0 for Ge0.9In0.015Cu0.125Te by decoupling electron and phonon transport in GeTe.
Article
Chemistry, Multidisciplinary
Yu Pan et al.
Summary: This study focuses on investigating the contribution of Dirac bands to thermoelectric performance, and their ability to achieve large thermopower and low resistivity in novel semimetals.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Moinak Dutta et al.
Summary: In this study, lattice dynamics in the Zintl compound TlInTe2 were investigated, revealing that the intrinsic rattling nature of Tl leads to strong phonon scattering and a remarkably low phonon lifetime, resulting in an ultralow thermal conductivity in TlInTe2.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Multidisciplinary Sciences
Chen Chen et al.
Summary: The Zintl thermoelectric phase Eu2ZnSb2 combines high mobility and low thermal conductivity, with partial ordering and disorder on longer scales at the Zn site leading to a reduction in thermal conductivity. This intrinsic nanostructuring preserves electron mobility, providing a direction for identifying Zintl compounds with ultralow lattice thermal conductivity and good electrical conductivity. Understanding mechanisms for obtaining low thermal conductivity without degraded electrical properties remains a challenge, with the authors revealing a mechanism for thermal conductivity reduction in a Zintl phase thermoelectric based on disorder length scales in Eu2ZnSb2.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Min Jin et al.
Summary: This study focuses on the anisotropy of transport properties in n-type Mg3Sb2, revealing nearly isotropic transport properties in centimeter-sized single crystals, and uncovering the origins of low lattice thermal conductivity and superior electronic performance in the material.
MATERIALS TODAY PHYSICS
(2021)
Article
Chemistry, Physical
Zihang Liu et al.
Summary: Researchers have made significant advancements in thermoelectric materials by adding minor amounts of Cu to the Mg3Sb1.5Bi0.5 system, leading to improved thermoelectric performance and reduced thermal conductivity. Through grain-boundary engineering, the detrimental effects of thermally activated electrical conductivity were successfully eliminated. The fabricated thermoelectric module, when combined with a p-type alpha-MgAgSb-based material, showed promising potential for low-temperature thermoelectric harvesting.
Article
Multidisciplinary Sciences
Airan Li et al.
Summary: The authors experimentally demonstrated the effective use of valley anisotropy in enhancing the thermoelectric performance of materials with anisotropic Fermi pockets, showing a 3-fold increase in carrier mobility along the light-band direction compared to the heavy-band direction, accompanied by a similar Seebeck coefficient and lower lattice thermal conductivity, resulting in a 3.6-fold increase in room-temperature zT. Additionally, first-principles calculations of 66 isostructural Zintl phase compounds were conducted, with 9 of them displaying a p(z)-orbital-dominated valence band similar to Mg3Sb2.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Zhonglin Bu et al.
Summary: Thermoelectric technology, traditionally limited by Bi2Te3 alloys, has shown potential for higher efficiency with the development of new materials like p-GeTe and n-Mg3Sb2. These non-Bi2Te3 materials could significantly improve waste-heat recovery applications, indicating a promising future for thermoelectric technology.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Tong Xing et al.
Summary: GeTe-based materials have shown great potential in thermoelectric generators for waste heat recovery. A high-energy conversion efficiency of 7.8% was achieved in a GeTe-based thermoelectric module. By using a high-throughput strategy, Mo was identified as an effective diffusion barrier material, leading to the fabrication of a module with comparable energy conversion efficiency to other materials.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Review
Chemistry, Multidisciplinary
Yuan Yu et al.
ADVANCED FUNCTIONAL MATERIALS
(2020)
Article
Nanoscience & Nanotechnology
Muchun Guo et al.
ACS APPLIED MATERIALS & INTERFACES
(2020)
Review
Chemistry, Multidisciplinary
Xiao-Lei Shi et al.
Article
Materials Science, Multidisciplinary
Li Yin et al.
Article
Materials Science, Multidisciplinary
Jing Wang et al.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2020)
Article
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Jinsuo Hu et al.
JOURNAL OF MATERIOMICS
(2020)
Article
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Udara Saparamadu et al.
JOURNAL OF MATERIALS CHEMISTRY A
(2020)
Article
Chemistry, Inorganic & Nuclear
Ke-Feng Liu et al.
JOURNAL OF SOLID STATE CHEMISTRY
(2019)
Article
Multidisciplinary Sciences
Hangtian Zhu et al.
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Rui Shu et al.
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(2019)
Article
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Cheng Sun et al.
JOURNAL OF MATERIOMICS
(2019)
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Zhenyu Pan et al.
JOURNAL OF MATERIALS CHEMISTRY A
(2019)
Article
Chemistry, Multidisciplinary
Kazuki Imasato et al.
ENERGY & ENVIRONMENTAL SCIENCE
(2019)
Review
Chemistry, Multidisciplinary
Zhiwei Chen et al.
ADVANCED MATERIALS
(2018)
Review
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Wanyue Peng et al.
INORGANIC CHEMISTRY FRONTIERS
(2018)
Review
Multidisciplinary Sciences
Jian He et al.
Article
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Jifeng Sun et al.
JOURNAL OF MATERIALS CHEMISTRY A
(2017)
Review
Materials Science, Multidisciplinary
Jing Shuai et al.
MATERIALS TODAY PHYSICS
(2017)
Review
Chemistry, Multidisciplinary
Tiejun Zhu et al.
ADVANCED MATERIALS
(2017)
Article
Physics, Applied
Jing Shuai et al.
APPLIED PHYSICS LETTERS
(2016)
Article
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J. J. Gong et al.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2016)
Article
Multidisciplinary Sciences
Jing Shuai et al.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2016)
Article
Chemistry, Physical
Jing Shuai et al.
JOURNAL OF MATERIALS CHEMISTRY A
(2016)
Review
Chemistry, Multidisciplinary
Joseph P. Heremans et al.
ENERGY & ENVIRONMENTAL SCIENCE
(2012)
Article
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Andrew F. May et al.
INORGANIC CHEMISTRY
(2011)
Review
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G. Jeffrey Snyder et al.
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Lon E. Bell
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S Lany et al.
