Article
Materials Science, Multidisciplinary
H. Y. Hong, D. H. Kim, S. O. Won, J. K. Lee, S. D. Park, S. M. Choi, S. H. Bae, K. Park
Summary: By introducing Cu2-ySe nanoinclusions into the Bi0.86Ba0.14CuSeO matrix, the electrical conductivity and thermoelectric properties can be improved while reducing lattice thermal conductivity, leading to enhanced thermoelectric performance.
Increasing the content of Cu2-ySe significantly boosts the electrical conductivity of the composite materials, with the best dimensionless figure-of-merit achieved at x = 0.15.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Multidisciplinary
Yangyang Wang, Zhaoyang Li, Zhibiao Ma, Lingxu Wang, Xiaodong Guo, Yan Liu, Bingdong Yao, Fengqing Zhang, Luyi Zhu
Summary: BSFMx films were prepared by the sol-gel method and their crystal structure, phase composition, oxygen vacancy content, and various properties were systematically analyzed. The study found that doping Sm at an appropriate amount can reduce the leakage property, improve the dielectric property, and delay the aging process of the films.
Article
Materials Science, Ceramics
Zhifang Zhou, Yunpeng Zheng, Yueyang Yang, Wenyu Zhang, Bin Wei, Mingchu Zou, Jinle Lan, Ce-Wen Nan, Yuan-Hua Lin
Summary: This study demonstrated that more zinc oxide-gallium-doped zinc oxide (ZnO-GZO) interfaces can improve carrier transport and enhance the thermoelectric performance, resulting in an improved power factor value of 439 mu W m(-1) K-2 at 623 K. The analysis of weighted mobility provided insights into the beneficial effects of multiple interfaces on electrical transport performance, paving the way for further optimization of thermoelectric performance.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Multidisciplinary Sciences
Jin Yue, Yilikal Ayino, Tristan K. Truttmann, Maria N. Gastiasoro, Eylon Persky, Alex Khanukov, Dooyong Lee, Laxman R. Thoutam, Beena Kalisky, Rafael M. Fernandes, Vlad S. Pribiag, Bharat Jalan
Summary: Using hybrid MBE, high-quality SrTiO₃ films with low defect density were obtained, and their transport properties were studied. The dominant influence of intraband scattering at the second Lifshitz transition was observed, along with the anomalous temperature dependence of the Hall scattering factor and carrier density due to the antiferrodistortive transition.
Article
Chemistry, Physical
Mujde Yahyaoglu, Melis Ozen, Yurii Prots, Oussama El Hamouli, Vahe Tshitoyan, Huiwen Ji, Ulrich Burkhardt, Bertrand Lenoir, G. Jeffrey Snyder, Anubhav Jain, Christophe Candolfi, Umut Aydemir
Summary: The Cu3-xTe2 rickardite mineral, synthesized successfully through a solid-state method, exhibits excellent thermoelectric performance at high temperatures, making it suitable for various applications such as waste heat harvesting and photovoltaic systems.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Christopher Perez, Atharv Jog, Heungdong Kwon, Daniel Gall, Mehdi Asheghi, Suhas Kumar, Woosung Park, Kenneth E. Goodson
Summary: In this study, time-domain thermoreflectance was used to uncover cross-plane heat conduction mechanisms in high aspect ratio metal nanostructures. The findings demonstrate the existence of unexplored heat transport modes in nanostructured metals, which can be utilized to develop electro-thermal solutions for modern microelectronic devices and sensors.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Physics, Applied
Manhong Zhang, Shaojun Liang, Hanming Zhu, Song Yue
Summary: Introducing SnS into p-type PbTe film through intermittent magnetron co-sputtering technique was found to induce a shift in the predominant orientation as well as distinct changes in the surface morphology. After appropriate annealing, both the electrical conductivity and power factor (PF) were significantly improved, with a maximum PF increase of 217% compared to the pristine PbTe film.
MODERN PHYSICS LETTERS B
(2023)
Review
Chemistry, Multidisciplinary
Tian-Ran Wei, Pengfei Qiu, Kunpeng Zhao, Xun Shi, Lidong Chen
Summary: Ag(2)Q-based materials, such as silver chalcogenides, have complex crystal structures, high carrier mobility, low lattice thermal conductivity, and exceptional plasticity, making them potential thermoelectric materials. This review focuses on the latest advances in this material family, including the understanding of multi-scale structures and peculiar properties, the optimization of thermoelectric performance, and the rational design of new materials. The correlation between composition-phase structure and thermoelectric/mechanical properties is emphasized. Flexible and hetero-shaped thermoelectric prototypes based on Ag(2)Q materials are also demonstrated. Several key problems and challenges for further understanding and optimization of Ag(2)Q-based thermoelectric chalcogenides are proposed.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
A. M. Adam, A. K. Diab, M. Ataalla, Maged F. Alotaibi, Abdulaziz N. Alharbi, E. M. Elsehly
Summary: This article discusses the synthesis of thin films of (Bi2Se3)(1-x)(Bi2Te3) x by thermal evaporation in high vacuum and explores their crystal structure, surface morphology, and thermoelectric properties. The results show that the thin films have perfect crystallinity and nano-scalability, and exhibit a high thermoelectric effect, making them suitable for applications in waste resource recovery and environmental applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Nouredine Oueldna, Alain Portavoce, Maxime Bertoglio, Andrea Campos, Abelkhalek Kammouni, Khalid Hoummada
Summary: This study investigates the phase transitions in Mg-Ag-Sb thin films produced by magnetron sputtering. The results show that using a single alloyed target or co-sputtering three elements cannot produce homogeneous alpha-MgAgSb films. It is also found that the composition of the phases alpha-MgAgSb and gamma-MgAgSb vary during annealing, contrary to previous beliefs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Multidisciplinary Sciences
Yinong Yin, Ashutosh Tiwari
Summary: The thickness of Ca3Co4O9 thin films grown on single-crystal Sapphire (0001) substrate affects the Seebeck coefficient, electrical conductivity, and power factor. The films with 60 nm thickness showed the highest power factor. The overall increase in the Seebeck coefficient with decreasing film thickness was accompanied by a simultaneous decrease in the electrical conductivity, leading to a non-monotonous dependence of the power factor on thickness.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Qichao Chen, Jiayi Chen, Xiao Xu, Zhehan Wang, Yamei Ding, Le Xiong, Beibei Zhu, Li Tao
Summary: Vapor-solid growth (VSG) is an effective technique for synthesizing Bi2Se3 materials with promising thermoelectric performance. By regulating the carrier gas flow rate during the VSG process, smooth Bi2Se3 thin films with enhanced TE performance have been achieved. The optimized morphology improves the electrical conductivity and decouples its interplay with the Seebeck coefficient in Bi2Se3.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Nanoscience & Nanotechnology
Shintaro Maeda, Takamitsu Ishiyama, Takeshi Nishida, Tomoki Ozawa, Noriyuki Saitoh, Noriko Yoshizawa, Takashi Suemasu, Kaoru Toko
Summary: In this study, researchers successfully synthesized a Ge1-x-ySixSny alloy thin film and demonstrated its excellent performance in thermoelectric applications through composition control and solid-phase diffusion. The results indicate that Group IV alloys are promising candidates for high-performance and reliable thin-film thermoelectric generators.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Applied
Thorsten Schneider, Juliette Cardoletti, Hui Ding, Mao-Hua Zhang, Tianshu Jiang, Marton Major, Philipp Komissinskiy, Leopoldo Molina-Luna, Lambert Alff
Summary: An antipolar phase and thickness-dependent properties were confirmed for NaNbO3 thin films grown on SrTiO3 (100) substrates by pulsed laser deposition. Characteristic 1/4 superlattice reflections revealed the antipolar displacement of Na and Nb ions. X-ray diffraction showed two different orientations of the same phase for films beyond a critical thickness, with an explanation based on extraordinary strain compensation mechanism. The polarization vs electric field behavior exhibited a thickness dependence, with a stabilized antiferroelectric phase for very thin films and field induced ferroelectric hysteresis for thicker films.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Md Mofasser Mallick, Avishek Sarbajna, Andres Georg Roesch, Leonard Franke, Holger Gesswein, Yolita M. Eggeler, Uli Lemmer
Summary: This study presents a facile method to prepare a flexible thermoelectric film with enhanced performance. The film exhibits exceptional flexibility with minimal change in resistance after multiple bending cycles. By substituting a specific element, the power factor and thermal conductivity of the film are improved, resulting in higher figure-of-merit values at both room temperature and elevated temperatures. The fabricated film is demonstrated to generate power and voltage in a thermoelectric generator.
APPLIED MATERIALS TODAY
(2022)
Review
Chemistry, Multidisciplinary
Tian-Ran Wei, Pengfei Qiu, Kunpeng Zhao, Xun Shi, Lidong Chen
Summary: Ag(2)Q-based materials, such as silver chalcogenides, have complex crystal structures, high carrier mobility, low lattice thermal conductivity, and exceptional plasticity, making them potential thermoelectric materials. This review focuses on the latest advances in this material family, including the understanding of multi-scale structures and peculiar properties, the optimization of thermoelectric performance, and the rational design of new materials. The correlation between composition-phase structure and thermoelectric/mechanical properties is emphasized. Flexible and hetero-shaped thermoelectric prototypes based on Ag(2)Q materials are also demonstrated. Several key problems and challenges for further understanding and optimization of Ag(2)Q-based thermoelectric chalcogenides are proposed.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Xusheng Liu, Tong Xing, Pengfei Qiu, Tingting Deng, Peng Li, Xuewen Li, Xiaoya Li, Xun Shi
Summary: High zT and good mechanical properties are achieved for Bi2Te3-based alloys through hot extrusion, which refines the large grains and reduces the donor-like effect. The extruded polycrystalline Bi2Te2.79Se0.21 exhibits preferred orientation and high carrier mobility. The total thermal conductivity is decreased due to enhanced phonon scattering. This study provides a fast and low-cost technique to improve the TE and mechanical properties of commercial Bi2Te3 ingots at room temperature.
JOURNAL OF MATERIOMICS
(2023)
Article
Materials Science, Multidisciplinary
Yifang Huang, Jingdan Lei, Heyang Chen, Zhengyang Zhou, Hongliang Dong, Shiqi Yang, Haotian Gao, Tian -Ran Wei, Kunpeng Zhao, Xun Shi
Summary: Through the use of tantalum-sealing melting technique, high-quality pure alpha-MgAgSb with large grain size and less oxygen content was obtained. The as-synthesized tantalum-sealing melted alpha-MgAgSb exhibited intrinsically low thermal conductivity, large weighted mobility, and high carrier concentration. A maximum thermoelectric figure of merit zT value of 1.3 was achieved at around 500 K, and the average power factors and average zT values in the low-temperature range of (300 -550) K were as high as 25 mu W cm-1 K-2 and 1.1 respectively, ranking among the top values among known materials. This study provides new insights into the intrinsic properties of alpha-MgAgSb and demonstrates its great potential in harvesting low-grade waste heat.
Article
Materials Science, Multidisciplinary
Hong Su, Ping Lu, Chenxi Zhu, Wujie Qiu, Xianxiu Qiu, Kunpeng Zhao, Xiaoyue Lu, Yuyu Wei, Xun Shi, Lidong Chen, Fangfang Xu
Summary: High-performance thermoelectric Cu2Te1-xSx solid solutions can be formed over a wide compositional range despite the large atomic size difference between S and Te. The Cu sublattice exhibits partial order and even amorphous substructures in some compositions, while the S/Te sublattice is chemically disordered yet crystalline. The precise order-disorder configurations of the cation-anion sublattices and their evolution with compositional change remain unclear.
Article
Chemistry, Multidisciplinary
Qingyu Yang, Chen Ming, Pengfei Qiu, Zhengyang Zhou, Xianxiu Qiu, Zhiqiang Gao, Tingting Deng, Lidong Chen, Xun Shi
Summary: AgCuSe-based materials have been attracting attention in the field of thermoelectric (TE) recently due to their high electron mobility, low thermal conductivity, and abnormal brittle-ductile transition at room temperature. This study found that the crystal structure of AgCuSe-based materials is incommensurately modulated and has weak local lattice distortion. The delocalized and isotropic feature of Ag 5s states contributes to high carrier mobility, while the inhomogeneous, weak, and anisotropic Ag-Se bonds result in ultralow lattice thermal conductivity. Furthermore, alloying S in AgCuSe strengthens the interaction between adjacent Ag-Se layers, leading to a brittle-ductile transition at room temperature.
Article
Chemistry, Physical
Siyu Wang, Tong Xing, Tian-Ran Wei, Jiawei Zhang, Pengfei Qiu, Jie Xiao, Dudi Ren, Xun Shi, Lidong Chen
Summary: In this work, a series of Se-alloyed GeSb4Te7 compounds were synthesized and their structures and transport properties were systematically investigated. Raman analysis revealed that Se alloying introduced a new vibrational mode of GeSe2, enhancing the interatomic interaction forces and reducing the carrier concentration. Se alloying also increased the effective mass and improved the Seebeck coefficient of GeSb4Te7. The decrease in carrier concentration reduced the carrier thermal conductivity, resulting in optimized thermoelectric performance.
Article
Materials Science, Multidisciplinary
Yajun Wang, Zhi Long, Yao Cheng, Min Zhou, Hongyi Chen, Kunpeng Zhao, Xun Shi
Summary: In this study, the phase transition temperature of Cu2S was significantly suppressed by tuning the chemical bonding through Mn-doping. This led to the formation of a high-symmetry cubic phase with desirable thermoelectric properties at a much lower temperature regime. The weakened chemical bonding facilitated the formation of Cu vacancies and improved the hole concentrations for optimized electrical transports. Additionally, the lattice thermal conductivity was suppressed by reducing the sound velocity through lattice softening and enhancing phonon scattering by point defects. As a result, high average power factors of 6.13 mu W cm-1 K-2 and average zT values of 0.44 were achieved in the temperature range of 423 to 723 K, surpassing most Cu2S-based materials reported so far. This study demonstrates that chemical bonding engineering can serve as a scaffold for regulating the phase structures and transport properties in thermoelectric materials.
MATERIALS TODAY PHYSICS
(2023)
Review
Chemistry, Multidisciplinary
Ruisi Chen, Lidong Chen, Ziqi Liang
Summary: Metal halide perovskites (MHPs) have unique thermal and electrical properties, making them promising in thermoelectric (TE) applications. However, their poor electrical conductivity hinders their practical use. This Minireview summarizes various doping strategies for MHPs and explores their impacts on thermal and electrical transport. A rational guideline is derived to enhance electrical doping in perovskite TEs.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Physics, Applied
Yifei Xiong, Zhicheng Jin, Tingting Deng, Pengfei Qiu, Lili Xi, Jiong Yang, Xun Shi, Lidong Chen
Summary: In this study, Cu2TiTe3 is identified as a promising thermoelectric material for middle-temperature range, with high electronic quality factor, power factor, and low lattice thermal conductivity.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Hexige Wuliji, Yupeng Ma, Heyang Chen, Tian-Ran Wei, Kunpeng Zhao, Yi-Yang Sun, Xun Shi
Summary: A dynamical approach is proposed to accurately describe the structure of Ag2S, a significant ductile semiconductor with promising thermoelectric and optoelectronic properties. The approach combines ab initio molecular dynamics simulation and density functional theory calculations, and successfully reproduces the experimental data.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Multidisciplinary Sciences
Huanyi Xue, Ruijie Qian, Weikang Lu, Xue Gong, Ludi Qin, Zhenyang Zhong, Zhenghua An, Lidong Chen, Wei Lu
Summary: The study of thermoelectric behaviors in miniatured transistors is crucial for bottom-level thermal management. Recent progress in nanothermetry enables the observation of temperature profiles in nanostructured materials and molecular junctions. This study addresses the thermoelectric effect in silicon and discovers the potential for on-chip refrigeration using silicon itself.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Peng Li, Pengfei Qiu, Jie Xiao, Tingting Deng, Lidong Chen, Xun Shi
Summary: Ettingshausen refrigeration, a solid-state refrigeration technology, lacks high-performance polycrystalline thermomagnetic materials. In this study, we report the giant Nernst power factor (PF(N)) and Nernst figure-of-merit (z(N)) of polycrystalline topological semimetal NbSb2, which are record-high values among polycrystalline thermomagnetic materials. The high thermomagnetic performance of NbSb2 is attributed to its large and unsaturated Nernst thermopower under a high magnetic field. Polycrystalline NbSb2, with its excellent thermomagnetic performance and low-cost fabrication process, is a competitive candidate material for Ettingshausen refrigeration.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Physical
Min Li, Hexige Wuliji, Zhengyang Zhou, Pengfei Qiu, Kunpeng Zhao, Xun Shi
Summary: As a typical liquid-like material, the argyrodite-type Ag9GaSe6 has attracted attention for its liquid-like characteristics, complex crystal structures, and high carrier mobility. By alloying Sn and Te into Ag9GaSe6, the electrical and thermal properties are optimized with a significantly improved Seebeck coefficient and greatly reduced lattice thermal conductivity. This leads to a boosted zT value of 1.4, representing a 75% improvement over pristine Ag9GaSe6.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
