Review
Engineering, Electrical & Electronic
Qihao Zhang, Kangfa Deng, Lennart Wilkens, Heiko Reith, Kornelius Nielsch
Summary: This review examines the development of micro-thermoelectric devices, exploring progress in device design, integration, and performance, as well as the potential applications of the technology in cooling, power generation, and sensing. These devices offer faster response time, higher resolution, and greater power density compared to their commercial counterparts, making them crucial for highly integrated electronic devices, the Internet of Things, and flexible and wearable technology.
NATURE ELECTRONICS
(2022)
Article
Thermodynamics
Olga Caballero-Calero, Marta Rull-Bravo, Dieter Platzek, M. Dolores Cardenas, Ricardo Fernandez, Alberto Moure, Jose Francisco Fernandez, Marisol Martin-Gonzalez
Summary: This article discusses the importance of thermoelectric applications in the medium temperature range (200-600 degrees C) and the fabrication method and applications of nanostructured Skutterudites. By improving the thermal conductivity of the mineral materials, competitive values of thermoelectric properties can be obtained and applied in areas such as automotive waste heat recovery.
Article
Chemistry, Multidisciplinary
Hanhwi Jang, Jong Ho Park, Ho Seong Lee, Byungki Ryu, Su-Dong Park, Hyeon-Ah Ju, Sang-Hyeok Yang, Young-Min Kim, Woo Hyun Nam, Heng Wang, James Male, Gerald Jeffrey Snyder, Minjoon Kim, Yeon Sik Jung, Min-Wook Oh
Summary: Suppressing Te vacancies by Ag doping can achieve high thermoelectric performance, and the synergy between defect and carrier engineering offers a pathway for enhancing the properties of thermoelectric materials.
Article
Chemistry, Multidisciplinary
Masatoshi Kimura, Xinyi He, Takayoshi Katase, Terumasa Tadano, Jan M. Tomczak, Makoto Minohara, Ryotaro Aso, Hideto Yoshida, Keisuke Ide, Shigenori Ueda, Hidenori Hiramatsu, Hiroshi Kumigashira, Hideo Hosono, Toshio Kamiya
Summary: A large enhancement in thermopower (S) is observed in thin films of LaNiO3 due to heterostructuring, with a 10 times enhancement over the bulk value. This enhancement is attributed to phonon drag effect and enhanced electron-phonon interaction, showing potential for high-performance thermoelectrics in transition-metal oxide heterostructures.
Article
Chemistry, Multidisciplinary
Bryan T. Spann, Joel C. Weber, Matt D. Brubaker, Todd E. Harvey, Lina Yang, Hossein Honarvar, Chia-Nien Tsai, Andrew C. Treglia, Minhyea Lee, Mahmoud I. Hussein, Kris A. Bertness
Summary: With the combination of nanopillars and membranes, the thermal conductivity of thermoelectric materials has been significantly reduced while the electrical conductivity remains unaffected, achieving decoupling of thermoelectric properties. This finding paves the way for high-efficiency solid-state energy recovery and cooling.
ADVANCED MATERIALS
(2023)
Review
Engineering, Environmental
Jinchang Sun, Yu Zhang, Yuting Fan, Xinfeng Tang, Gangjian Tan
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)
Article
Materials Science, Multidisciplinary
Jose M. Sojo-Gordillo, Denise Estrada-Wiese, Carolina Duque-Sierra, Gerard Gadea-Diez, Marc Salleras, Luis Fonseca, Alex Morata, Albert Tarancon
Summary: The effect of tuning the p-type doping level in silicon nanowires on thermoelectric properties is studied. The carrier concentration of the nanowires can be controlled by varying the amount of dopant gas, thus affecting their thermoelectric performance. Optimized nanowires are used in a micro-machined thermoelectric generator, showing high open circuit voltage and maximum power output.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Thermodynamics
Zhengyang Zhao, Zhengxing Zuo, Wei Wang, Nianling Kuang, Peiyun Xu
Summary: This study proposes an opposed flow porous micro combustor structure that provides stable combustion under high inlet power. The results show that the combustor meets the temperature requirements of thermoelectric module and has a high thermal efficiency and power density. By improving the structure and customizing the thermoelectric module, the system achieves both high conversion efficiency and power density.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Materials Science, Composites
Jiaji Yang, Yanhua Jia, Youfa Liu, Peipei Liu, Yeye Wang, Meng Li, Fengxing Jiang, Xiaoqi Lan, Jingkun Xu
Summary: This study prepared ternary thermoelectric fibers based on PEDOT:PSS, Te-NWs, and PVA, with enhanced mechanical performance and electrical conductivity by introducing PVA. The composite fibers showed improved electrical conductivity and power factor. Finally, a FTEG was assembled, demonstrating good mechanical flexibility and voltage output performance.
COMPOSITES COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Ao Wu, Yujie Xia, Yiming Zhang, Lei Peng, Hezhu Shao, Yan Cen, Heyuan Zhu, Hao Zhang
Summary: This study demonstrates the significance of electron-phonon and phonon-phonon interactions in 2D lead phosphorene. It reveals the effects of symmetry breaking and strong high-order phonon-phonon interactions on the thermoelectric properties. The findings provide insights for the development of promising thermoelectric materials.
ADVANCED THEORY AND SIMULATIONS
(2023)
Article
Biochemistry & Molecular Biology
Benxiang Wei, Joseph M. Flitcroft, Jonathan M. Skelton
Summary: This study presents a detailed first-principles modeling study of the thermal transport in framework structures, revealing their lower thermal conductivity compared to bulk Si. The energetics of these structures are determined by differences in lattice energy, while the differences in phonon group velocities and lifetimes contribute to the differences in thermal conductivity.
Article
Multidisciplinary Sciences
Sien Wang, Yue Xiao, Qiyu Chen, Qing Hao
Summary: Nanoporous Si films have potential applications in thermoelectrics and thermal management of devices. Offset nanoslot patterns achieve smaller characteristic lengths and lower thermal conductivity compared to periodic circular pores. Additional reduction in thermal conductivity can be achieved by implanting Ga ions.
Article
Materials Science, Multidisciplinary
Zhongxin Liang, Miaomiao Jian, Congcong Xu, Bing-Hua Lei, Xin Shi, Hongjing Shang, Shaowei Song, Wuyang Ren, Fazhu Ding, David J. Singh, Zhenzhen Feng, Zhifeng Ren
Summary: M$3Sb2-based Zintl compounds have great potential for thermoelectric power generation due to their high thermoelectric performance, low cost, and mechanical robustness. However, their practical application is hindered by low thermal stability caused by significant Mg loss at elevated temperatures. This study investigates the strategy of Mn doping at the Mg site to enhance the thermal stability of M$3Sb2-based materials. The results show that Mn-doped Mg3Sbi.3Bio.3 exhibits high structural stability and negligible variation in electrical performance, making it a promising candidate for thermoelectric applications.
Article
Chemistry, Multidisciplinary
Xingchen Shen, Michael Marek Koza, Yung-Hsiang Tung, Niuchang Ouyang, Chun-Chuen Yang, Chen Wang, Yue Chen, Kristin Willa, Rolf Heid, Xiaoyuan Zhou, Frank Weber
Summary: The coexistence of rigid and mobile sublattices in superionic Argyrodites leads to low thermal conductivity and high electrical and ionic conductivities, making it attractive for various applications. However, the understanding of the underlying lattice and diffusive dynamics in terms of the interaction between phonons and mobile ions is still incomplete. In this study, inelastic neutron scattering and molecular dynamics simulations are used to reveal that phonon softening triggers fast diffusion of Ag ions in superionic Argyrodite Ag8GeSe6. This study demonstrates the microscopic connection between soft phonons and mobile ions and provides insights into the intertwined lattice and diffusive dynamics in superionic materials.
Article
Thermodynamics
Zhicheng Shen, Yao Yao, Qiliang Wang, Lin Lu, Hongxing Yang
Summary: Recently, there has been considerable interest in utilizing surplus pressure in water pipelines to generate energy for intelligent water networks using micro hydropower generation systems. However, traditional hydropower generators with mechanical seals suffer from friction loss and water leakage issues, leading to low power generation efficiency and operational stability. To address this, a novel integrated permanent magnet generator (IPMG) with a static seal is proposed and optimized using a finite element method. Experimental testing of an IPMG prototype shows that it outperforms traditional generators by completely eliminating friction loss and reducing leakage, resulting in extended operating hours and increased annual power generation.
Article
Neurosciences
Antje Kilias, Susanne Tulke, Nicole Barheier, Patrick Ruther, Ute Haeussler
Summary: The CA2 pyramidal cells in mesial temporal lobe epilepsy (MTLE) with hippocampal sclerosis show increased excitability and are integrated into the epileptic hippocampal network via mossy fiber sprouting. Our study suggests that CA2 plays an important role in the epileptic network and may serve as a possible router for aberrant activity.
Article
Chemistry, Multidisciplinary
Roman Anufriev, Daisuke Ohori, Yunhui Wu, Ryoto Yanagisawa, Laurent Jalabert, Seiji Samukawa, Masahiro Nomura
Summary: The high thermal conductivity of silicon limits the performance of silicon-based thermoelectric energy generators. Past theoretical works proposed reducing the thermal conductivity with nanopillars on silicon films. However, due to difficulties in nanofabrication and measurements, these predictions were never confirmed. In this work, we fabricated and measured silicon films with nanopillars as small as 12 nm in diameter. Our experiments showed that nanopillars do host resonant phonon modes, but thermal measurements revealed no significant difference compared to silicon membranes without nanopillars. These results contradict previous predictions, suggesting the need for refined simulations under realistic experimental conditions.
Article
Materials Science, Multidisciplinary
Tianhui Zhu, Yunhui Wu, Shuai Li, Farjana F. Tonni, Masahiro Nomura, Mona Zebarjadi
Summary: Silicon thin films are promising for chip-integrated Peltier micro-coolers and thermoelectric power generators due to their compatibility and cost effectiveness. This study focuses on reducing thermal conductivity by creating patterned nano-holes in single crystalline silicon thin films and surface doping them with organic molecules F4TCNQ. The results show significant improvements in electrical conductivity and power factor.
MATERIALS TODAY PHYSICS
(2023)
Article
Physics, Applied
Jose Ordonez-Miranda, Laurent Jalabert, Yunhui Wu, Sebastian Volz, Masahiro Nomura
Summary: This article derives and analytically integrates models for the heater and sensor 3? signals of the temperature field of anisotropic bulk materials and thin films. The integration is done using the Fourier transform and expressing the frequency dependence of temperature in terms of the modified Bessel and Struve functions. The exact integrated models are expected to facilitate the accurate determination of the thermal conductivity and thermal diffusivity of anisotropic materials through a wide spectrum of modulation frequencies and without time-consuming numerical integration.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Condensed Matter
J. Valenta, N. Tsujii, H. Yamaoka, F. Honda, Y. Hirose, H. Sakurai, N. Terada, T. Naka, T. Nakane, T. Koizumi, H. Ishii, N. Hiraoka, T. Mori
Summary: This study reports the first investigation of YbCo2 using electrical resistivity, magnetization, and specific heat measurements. No evidence of magnetic ordering was observed in a single-phased sample of YbCo2 down to 0.3 K in a zero magnetic field. The specific heat measurements suggest a large electronic specific heat due to strong intersite magnetic correlation in both the 3d and 4f electrons.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Physics, Multidisciplinary
Hitoshi Yamaoka, Ayako Ohmura, Naohito Tsujii, Yusaku Furue, Hirofumi Ishii, Nozomu Hiraoka
Summary: The electronic structures of YbInCu4, Y0.1Yb0.9InCu4, YbIn0.95Ag0.05Cu4, and YbIn0.9Ag0.1Cu4 were measured under pressure at 300 K. It was found that the Yb valence of Y0.1Yb0.9InCu4 gradually increases with pressure, reaching a maximum of 27 GPa. However, YbInCu4 and YbIn0.9Ag0.1Cu4 showed a decrease in Yb valence under pressure without a structural phase transition. The anomalous decrease in Yb valence was enhanced at low temperature in a similar pressure range.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Multidisciplinary Sciences
Xin Huang, Yangyu Guo, Yunhui Wu, Satoru Masubuchi, Kenji Watanabe, Takashi Taniguchi, Zhongwei Zhang, Sebastian Volz, Tomoki Machida, Masahiro Nomura
Summary: This study experimentally confirms the existence of phonon Poiseuille flow in graphitic systems, providing important insights into phonon hydrodynamics and advances in heat manipulation applications.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Xin Huang, Satoru Masubuchi, Kenji Watanabe, Takashi Taniguchi, Tomoki Machida, Masahiro Nomura
Summary: The temperature dependence of thermal conductivity in solids has been widely studied and considered as evidence for hydrodynamic phonon transport. However, the direct demonstration of hydrodynamic thermal conduction and its dependence on structure width remains unexplored. In this work, we experimentally measured thermal conductivity in graphite ribbon structures with different widths and observed enhanced width dependence in the hydrodynamic window. These findings provide important evidence for phonon hydrodynamic transport and can guide future efforts in heat dissipation for electronic devices.
Article
Physics, Applied
Jose Ordonez-Miranda, Yuriy A. Kosevich, Bong Jae Lee, Masahiro Nomura, Sebastian Volz
Summary: The thermal conductance and thermal conductivity of plasmons in metallic nanofilms deposited on a substrate were studied. The symmetric and antisymmetric spatial distribution modes of the magnetic field drive the plasmon energy transport along the film interfaces. The plasmon thermal conductance is higher for hotter and/or longer films, saturating for films thicker than 50 nm. The transition of plasmon modes maximizes the thermal conductivity for thinner films, and a 10 nm thick gold nanofilm at 300 K has a maximum thermal conductivity of 15 W m-1 K-1, about 25% of its electron counterpart. The plasmon thermal conductivity increases significantly with film length and temperature, potentially improving heat dissipation along metallic nanofilms.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Multidisciplinary
Yajuan Cheng, Zheyong Fan, Tao Zhang, Masahiro Nomura, Sebastian Volz, Guimei Zhu, Baowen Li, Shiyun Xiong
Summary: We report a local minimum in thermal conductivity in twisted bilayer graphene (TBG) at the angle of 1.08 degrees, which corresponds to the 'magic angle' in the transition of several other reported properties. The thermal magic angle arises from the competition between the delocalization of atomic vibrational amplitudes and stresses on one hand, and the increased AA stacking density on the other hand. The manifestation of a magic angle, disclosing new thermal mechanisms at nanoscale, further uncovers the unique physics of two-dimensional materials.
MATERIALS TODAY PHYSICS
(2023)
Article
Physics, Applied
Sota Koike, Ryoto Yanagisawa, Masashi Kurosawa, Rajveer Jha, Naohito Tsujii, Takao Mori, Masahiro Nomura
Summary: We experimentally investigated the effect of nanostructuring on the thermoelectric performance of SiGe thin films. Porous nanostructures were fabricated to reduce thermal conductivity and improve thermoelectric figure of merit. The results showed that the nanostructured SiGe thin films had a 24% lower thermal conductivity and a 19% lower electrical conductivity compared to films without nanostructure, resulting in a 4% increase in thermoelectric figure of merit at room temperature.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Applied
Rajveer Jha, Valenta Jaroslav, Naohito Tsujii, Takashi Naka, Takeshi Kawahata, Chiduru Kawashima, Hiroki Takahashi, Takao Mori, Yoshikazu Mizuguchi
Summary: We synthesized a new compound La2O2Bi3PbS6 with a crystal structure similar to that of La2O2Bi3AgS6 superconductor or La2O2Bi2Pb2S6 insulator. The La2O2Bi3PbS6 sample exhibited narrow gap semiconductor transport behavior and a metallic-like to insulator transition with increasing Pb substitution. External pressure was applied and pressure-induced superconductivity was observed in the La2O2Bi3PbS6 compound.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Applied
Byunggi Kim, Hodaka Kurokawa, Katsuta Sakai, Kazuki Koshino, Hideo Kosaka, Masahiro Nomura
Summary: This article presents an efficient quantum transduction scheme using a one-dimensional diamond optomechanical crystal cavity without optomechanical coupling. By manipulating the energy level of a coherent color-center electron and the strong mechanical-mode-color-center electron-coupling rate, high conversion efficiency quantum transduction is achieved. The results imply that this system offers a highly efficient platform for quantum transduction.
PHYSICAL REVIEW APPLIED
(2023)
Article
Multidisciplinary Sciences
Jean Cacheux, Jose Ordonez-Miranda, Aurelien Bancaud, Laurent Jalabert, Daniel Alcaide, Masahiro Nomura, Yukiko T. Matsunaga
Summary: The Starling principle explains the exchange between blood and tissues based on hydrostatic and osmotic flows. However, the effect of blood pressure on the permeability of collagen, the main component of tissues, remains poorly understood. In this study, an instrument was developed to measure the elasticity and permeability of collagen gels under tension and compression. The results showed a decrease in permeability and increased strain stiffening of native collagen gels under compression compared to tension, and these effects were diminished after chemical cross-linking. Additionally, the permeability of native collagen gels could be controlled using sinusoidal fluid injection, which was attributed to the asymmetric response to tension and compression. The findings suggest that blood-associated pulsations may contribute to tissue exchanges.
