Related references
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Article
Materials Science, Ceramics
Qiujun Hu et al.
Summary: By utilizing an interface engineering strategy, a promising ZT value (ZT = 1.33) was achieved in n-type Bi2Te2.7Se0.3 (BTS) materials, which greatly enhances the performance of Bi2Te3-based energy converters.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Jing Zhou et al.
Summary: The carrier concentration in n-type Bi2Te3-based thermoelectric material is stabilized by high-energy refinement and hot-pressing, combined with SbI3 doping and hot deformation, resulting in optimized carrier concentration and high texture degree. The peak figure of merit (zT) of 1.14 is achieved for Bi2Te2.7Se0.3 + 0.05 wt.% SbI3 sample with a bending strength of 100 Mpa. Additionally, a thermoelectric cooling device consisting of n-type Bi2Te2.7Se0.3 + 0.05 wt.% SbI3 and commercial p-type Bi0.5Sb1.5Te3 legs generates a large maximum temperature difference (Delta T-max) of 85 K at a hot-side temperature of 343 K.
Article
Chemistry, Physical
Yuxin Sun et al.
Summary: Introducing nanostructures is an effective method to improve the performance of thermoelectric materials. This study aims to develop p-type Sb2Te3-based alloys with high mechanical properties and high figure-of-merit ZT over a wide temperature range. Fine grains and nano-twins are formed by reducing Te content and high-energy ball milling, resulting in lower thermal conductivity and better mechanical properties. Copper doping is used to further optimize carrier and phonon transport behavior while maintaining excellent mechanical properties. The ZT value of the Sb1.82In0.15Cu0.03Te2.98 sample is enhanced up to 1.06 at 623 K and a high ZTave of 0.76 from 300 K to 673 K is achieved. A p-type segment leg composed of the present material and low-temperature Bi0.4Sb1.6Te3.01 is fabricated to achieve high conversion efficiency under a wider temperature range, reaching an efficiency as high as 9.2% under a temperature difference of 380 K.
Article
Engineering, Environmental
Shuhuan Yang et al.
Summary: This study investigates the effect of incorporating conductive polyaniline nanoparticles on the thermoelectric performance of Bi2Te3-based alloys. It is found that the inclusion of polyaniline nanoparticles can reduce the lattice thermal conductivity of the composite system by increasing phonon scattering and enhance the thermopower by inducing energy-dependent carrier scattering at the inorganic/organic boundaries. The composite sample with 1.5 wt% PANI inclusions achieves the maximum figure of merit Zmax = 3.57 x 10-3 K-1 (300 K) and the maximum dimensionless figure of merit ZTmax = 1.22 (345 K), which are 42% and 46% higher than those of pristine Bi2Te2.7Se0.3, respectively, demonstrating the effectiveness of incorporating nanophase polyaniline to enhance the thermoelectric performance.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Ceramics
Seunghyeok Lee et al.
Summary: This study demonstrates the use of atomic layer deposition (ALD) to create a thin Al2O3 layer on n-type Bi2Te2.7Se0.3, which helps improve their thermoelectric performance by reducing the adverse effects of multiple boundaries. The ALD cycle effectively suppresses volatilization and reduces the electron concentration while inducing numerous boundaries to decrease thermal conductivity. However, increasing the number of ALD cycles leads to a rise in resistance and degradation of performance. Overall, the ZT value is increased by 51% with a single ALD cycle.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Engineering, Environmental
Tao Chen et al.
Summary: By dispersing transition-metal selenide MnSb2Se4 (MSS) into Bi2Te2.7Se0.3 (BTS), the power factor (PF) of BTS can be greatly increased while the lattice thermal conductivity (kappa L) can be significantly reduced. The BTS/0.50 wt% MSS sample achieves a large ZTmax of 1.23 (at 345 K) and an average ZTave of -1.15 (300 K-473 K), which are respectively 48% and 42% larger than those of pristine BTS. Additionally, this sample also exhibits improved mechanical properties.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Physics, Applied
Gwansik Kim et al.
Summary: By investigating Cu-doped Bi2Te2.7Se0.3, it was found that Cu atoms preferentially occupied Bi sites and then intercalated into the van der Waals gap. This mechanism allowed for systematic control of the electrical transport properties of the Cu-doped samples, while also reducing the thermal conductivities through enhanced point defect phonon scattering. As a result, the dimensionless thermoelectric figure of merit (ZT) of the Cu-doped sample increased by more than 92%, reaching 0.98 at 323 K.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Cham Kim et al.
Summary: In this study, a bulk-structured composite was prepared by blending the abundant conducting polymer PEDOT:PSS with Bi2Te3. The composite exhibited improved power factor due to energy filtering effects at the interface and lower thermal conductivity due to phonon scattering effects. The electrical and thermal properties were decoupled, resulting in significantly enhanced figure of merits compared to pristine Bi2Te3.
APPLIED PHYSICS LETTERS
(2022)
Review
Engineering, Environmental
Jinchang Sun et al.
Summary: This review article summarizes recent research progress on PbSe-based thermoelectric materials. It provides a general introduction to the properties of IV-VI semiconductors, discusses the crystal and electronic band structures of PbSe, and explores how dopants regulate its carrier concentrations. The article also elaborates on the impact of electronic band structure engineering and microstructural architecturing on charge and phonon transport properties of PbSe. It concludes by discussing future directions for improving the thermoelectric properties of PbSe and promoting its applications.
CHEMICAL ENGINEERING JOURNAL
(2022)
Review
Chemistry, Physical
Yasaman Saberi et al.
Summary: This paper provides a review of different aspects of doping processes on Bi2Te3 based materials, addressing the challenges and exploring promising solutions. The study concludes that the doping process, annealing, and creation of nanostructured compounds contribute to the efficiency improvement of Bi2Te3 thermoelectric materials. Furthermore, it is suggested that thin film Bi2Te2.7Se0.3 and Bi0.5Sb1.5Te3 materials show the highest ZT values compared to other materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
M. Maksymuk et al.
Summary: This article introduces a thermoelectric material based on bismuth telluride compounds, which has achieved improved thermoelectric efficiency through optimized design and chemical composition. The different transport properties of materials were studied using three-dimensional finite-element simulation, and significant energy conversion efficiency was experimentally measured.
JOURNAL OF POWER SOURCES
(2022)
Article
Multidisciplinary Sciences
Lizhong Su et al.
Summary: Thermoelectric materials offer the potential for direct conversion of heat into electricity. Phonon-electron decoupling plays a critical role in achieving high-performance thermoelectrics.
Article
Materials Science, Multidisciplinary
Yifeng Wang et al.
Summary: A liquid-assisted shear exfoliation (LASE) combined with spark plasma sintering (SPS) was used to process n-type Bi2Te2.7Se0.3 and its effects on microstructure and anisotropic transport properties were investigated. The results showed that LASE effectively reduced the grain size and achieved a high texture in the materials. The electrical conductivity along the in-plane direction was significantly increased due to enhanced carrier concentration, resulting in a greatly improved power factor at 303K. Meanwhile, the total thermal conductivity was effectively reduced due to phonon scattering with the grain size reduction and the inhibition of bipolar contribution by increased carrier concentration. Ultimately, a peak thermoelectric figure of merit (ZT) value of 0.83 was obtained at 448K along the in-plane direction, which was increased by 95% compared to the pristine sample. These findings demonstrate the utility of the LASE process for enhancing the thermoelectric performance of layered materials.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Inorganic & Nuclear
Tao Chen et al.
Summary: The incorporation of Ag9AlSe6 phase into BTS can significantly reduce lattice thermal conductivity and enhance the Seebeck coefficient, leading to an improvement in thermoelectric performance.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Chemistry, Physical
Bushra Jabar et al.
Summary: Incorporation of nano-sized 3D topological insulator Bi2Se3 in n-type Bi2Te2.7Se0.3 alloy leads to improved electron mobility and electrical conductivity, as well as enhanced Seebeck coefficient due to energy dependent carrier scattering. Additionally, the inclusion of 3D-TI nanoinclusions results in enhanced phonon scattering, leading to a significant increase in power factor and decrease in total thermal conductivity of the material, ultimately increasing the figure of merit ZT.
Article
Materials Science, Multidisciplinary
Yu-Ke Zhu et al.
Summary: Introducing ultrafine bismuth sulfide nanograins and multiscale lattice defects successfully lowered the lattice thermal conductivity and increased the electrical conductivity, improving the thermoelectric performance close to Clarke's limitation. The small device fabricated using a specific sample achieved a high direct conversion efficiency, and the inverse changes in hardness and Young's modulus with Bi2S3 content were explored for potential improvements in mechanical and thermoelectric properties in thermoelectric materials.
Article
Chemistry, Physical
Jun Mao et al.
Summary: Solid-state thermoelectric devices can convert electricity into cooling through the Peltier effect. Commercialization of thermoelectric cooling technology has been based on Bi2Te3 alloys, but with the discovery of more promising materials, there is potential for reshaping the field. This review discusses the current status and future outlook of thermoelectric cooling materials.
Article
Materials Science, Multidisciplinary
Huiping Hu et al.
Summary: In this study, n-type pure phase Ag2Te compound was successfully synthesized and the co-precipitation of PbTe was found to improve the electrical stability of Ag2Te samples. A maximum zT of 0.72 was achieved at 570K for Pb-doped Ag2-xPbxTe (x = 0.03).
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Tao Chen et al.
Summary: The thermoelectric properties of CuSb1-xCdxSe2 compounds were studied, with Cd doping leading to a significant increase in the Seebeck coefficient and decrease in lattice thermal conductivity. The enhancement in thermopower is attributed to an increase in electronic density of states, while the decrease in thermal conductivity is due to enhanced phonon scattering by introduced impurity atoms. The substitution of Cd is shown to be a feasible way to improve the thermoelectric performance of the CuSbSe2-based system.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Sung-Jin Jung et al.
Summary: The study focused on modulating the microstructure of n-type Bi2Te2.82Se0.18 using a hot rolling process, where an increase in reduction ratio was found to accelerate grain refinement, improve carrier mobility, and enhance electrical conductivity.
Article
Chemistry, Physical
Houquan Deng et al.
Summary: By manipulating the band structure and introducing SnTe nanocrystals, ultrahigh thermoelectric performance of MnTe was achieved, with enhanced Seebeck coefficient and reduced lattice thermal conductivity. This novel strategy decouples electron and phonon transport of MnTe, contributing to a record high ZT value at 873 K for the Mn1.06Te-2% SnTe material, promoting MnTe-based materials as a robust candidate for waste heat recovery at medium temperature.
Article
Chemistry, Physical
Kunpeng Zhao et al.
Summary: This study presents a novel material series with crystal-amorphicity duality for high-performance thermoelectric materials design. By manipulating the crystal structure, the material exhibits excellent electrical properties and remarkably low lattice thermal conductivities at high temperatures.
Article
Nanoscience & Nanotechnology
Chen Zhu et al.
Summary: The study demonstrates that Gd substitution in Cu12Sb4S13 may enhance the material's thermoelectric performance, specifically through a significant increase in electrical conductivity and thermopower, as well as a dramatic reduction in lattice thermal conductivity. Experimental techniques such as XRD and synchrotron radiation photoelectron spectroscopy were used to explain the mechanism of Gd substitution on the material properties.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Qiujun Hu et al.
Summary: In this study, n-type Bi2Te2.7Se0.3 based thermoelectric materials incorporated with nanosized Y2O3 were prepared and studied, leading to significantly improved thermoelectric performance due to the multiscale interface modifications induced by the Y2O3 nanoparticles. The addition of Y2O3 NPs effectively reduced the thermal conductivity, increased the hardness, and maintained excellent thermoelectric properties in the entire operating temperature range. The strategy of high-density heterogeneous interfaces implemented by Y2O3 NP addition provides a feasible pathway for fabricating high-performance thermoelectric materials with optimized properties.
ACS APPLIED MATERIALS & INTERFACES
(2021)
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Hongwei Ming et al.
Summary: Improved thermoelectric performance of Cu2SnSe3 was achieved by doping In and S, leading to significant reduction in resistivity and enhancement of thermopower at room temperature, resulting in increased power factor. Additionally, lattice thermal conductivity was effectively reduced by inducing multidimensional defects, resulting in a record high figure of merit of ZT = 1.51 at 858 K for the doped sample.
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Chemistry, Physical
Jianbo Zhu et al.
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NPJ COMPUTATIONAL MATERIALS
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Summary: This study reviews the applications of heat transport in solid materials and outlines key strategies for enhancing thermoelectric performance by slowing down heat transport, including reducing thermal conductivity and introducing extrinsic phonon scattering centers.
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