Article
Engineering, Manufacturing
Zongqing Ren, Jae Choon Kim, Jaeho Lee
Summary: The study investigates the temporal and spatial interplays of various thermal effects in a holey silicon-based lateral thermoelectric device. Holey silicon with anisotropic thermal conductivities delays lateral diffusion while enabling rapid heat dissipation in the vertical direction, showing promise for dynamic thermal management of on-chip hot spots. The Thomson effect is found to strengthen the supercooling effect in the device.
IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Zongqing Ren, Jiahui Cao, Jungyun Lim, Ziqi Yu, Jae Choon Kim, Jaeho Lee
Summary: In this study, we demonstrate holey silicon-based thermoelectric cooling devices using simple fabrication processes and evaluate their cooling performance using infrared thermography. Our findings indicate that holey silicon can significantly reduce temperature over a large area when the underlying heating stage is set to a higher background temperature.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Engineering, Electrical & Electronic
Ki Mun Bang, Woosung Park, Pawel Ziolkowski, Hyungyu Jin
Summary: Stretchable electronic devices face challenges in thermal conductivity and heat dissipation. Innovative cooling platforms are required to address the heat dissipation issue. Adding alumina powder into the materials can enhance cooling performance and improve energy efficiency.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Chemistry, Physical
Shibo Liu, Yongxin Qin, Bingchao Qin, Yu Xiao, Li-Dong Zhao
Summary: By alloying Sn in PbTe to decrease its band gap, the average ZT value of n-type Pb0.785Sn0.2Sb0.015Te reaches approximately 0.74 in the temperature range of 300-723 K, showing promising cooling performance.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Liangjun Xie, Jiawei Yang, Ziyu Liu, Nuo Qu, Xingyan Dong, Jianbo Zhu, Wenjing Shi, Hao Wu, Guyang Peng, Fengkai Guo, Yang Zhang, Wei Cai, Haijun Wu, Hangtian Zhu, Huaizhou Zhao, Zihang Liu, Jiehe Sui
Summary: By introducing ultrafine grains and randomly distributed pores in α-MgAgSb, an ultralow lattice thermal conductivity and excellent thermoelectric performance are achieved, breaking the limitations of traditional thermoelectric materials and providing a swift pathway to the wide employment of thermoelectric cooling technology in modern society.
Article
Multidisciplinary Sciences
Lin Yang, Daihong Huh, Rui Ning, Vi Rapp, Yuqiang Zeng, Yunzhi Liu, Sucheol Ju, Yi Tao, Yue Jiang, Jihyun Beak, Juyoung Leem, Sumanjeet Kaur, Heon Lee, Xiaolin Zheng, Ravi S. Prasher
Summary: Silicon nanowires show potential in improving thermoelectric conversion efficiency at high temperatures. Researchers achieved high-performance thermoelectrics with improved ZT values by optimizing the synthesis method and enhancing the testing platform.
NATURE COMMUNICATIONS
(2021)
Article
Thermodynamics
Luyi Xing, Kaihua Xie, Yihua Zheng, Benzhi Hou, Liuyijie Huang
Summary: This paper proposes a thermal balance method for measuring thermal conductivity by compensating with electric cooling or heating based on thermoelectric modules to achieve accuracy and convenience. By using the principle of thermal balance, the thermal conductivity of the sample can be obtained by knowing the thermal conductivity of the compensation side. The experiment proved the feasibility of this method.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Polymer Science
Michal Guzej, Martin Zachar, Jan Kominek, Petr Kotrbacek, Robert Brachna
Summary: This study explores the potential of polymers with highly conductive fillers to replace standard materials for passive cooling, and demonstrates that adjusting the melt flow can enhance the overall cooling efficiency of a polymer heat sink. Variations in heat source temperatures were observed between two heat sinks with identical geometries under the same conditions.
Article
Chemistry, Multidisciplinary
Pavel V. Barkov, Olga E. Glukhova
Summary: This study investigates the impact of holey graphene with different neck widths on its electrical conductivity. It was found that the neck width can influence the conductivity and electronic energy gap of holey graphene, and demonstrated anisotropy in electrical conductivity.
Article
Materials Science, Multidisciplinary
Kyongmin Kim, Seungeun Mun, Moongyu Jang, Junghyun Sok, Kyoungwan Park
Summary: The thermoelectric properties of Ni/Ge-multilayer-laminated silicon devices were investigated with increasing number of Ni/Ge layers, showing improvement in Seebeck coefficient and decrease in thermal conductivity. A seven-layer Ni/Ge device achieved a high thermoelectric power factor and zT value at 510K.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Thermodynamics
Mengsheng Zhang, Zijun Li, Qiaoli Wang, Tianhui Yuan, Yu Xu
Summary: Cooling garments are a simple and energy-saving solution to relieve thermal stress. This study developed cooling garment prototypes using thermoelectric cooling and conducted performance tests in a simulated high-temperature environment. The results showed that water and 40% glycerin are both effective refrigerants, with water providing higher energy utilization efficiency and 40% glycerol delivering better cooling effect. By wearing the cooling garment with an optimal water inlet temperature of 22 degrees C in a 35 degrees C ambient temperature, the average temperature in the microclimate area was reduced to approximately 28.5 degrees C and the relative humidity dropped from 90% to 58%, demonstrating the effectiveness of the cooling garment in improving thermal comfort.
APPLIED THERMAL ENGINEERING
(2022)
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
Multidisciplinary Sciences
Bingchao Qin, Dongyang Wang, Xixi Liu, Yongxin Qin, Jin-Feng Dong, Jiangfan Luo, Jing-Wei Li, Wei Liu, Gangjian Tan, Xinfeng Tang, Jing-Feng Li, Jiaqing He, Li-Dong Zhao
Summary: This study developed SnSe crystals with wide bandgap and attractive thermoelectric properties through Pb alloying, demonstrating their potential for thermoelectric cooling applications.
Article
Chemistry, Physical
Giovanni Pennelli, Elisabetta Dimaggio, Antonella Masci
Summary: Silicon is well-known for its potential as a starting material for electronic devices and, when nanostructured, as an excellent material for thermoelectric applications. By optimizing parameters, such as doping concentration and nanowire diameter, silicon nanostructures could potentially achieve high figure of merit ZT at high temperatures. Researchers have proposed technological solutions for the fabrication of macroscopic thermoelectric devices based on silicon nanostructures.
Article
Energy & Fuels
Heegyeom Jeon, Jeong Ho Na, Yong Seok Kim, Seung-Keun Park, Youngjae Yoo
Summary: In this study, wave-selective emitter coolers were fabricated using glass bubbles and barium sulfate, and polyacrylonitrile nanofibers were electrospun on these coolers. The optical properties and cooling power were analyzed based on the ratio of glass bubbles and barium sulfate, as well as the electrospinning conditions. The cooler with the added electrospinning layer showed higher reflectivity and cooling power compared to the cooler containing only polydimethylsiloxane/glass bubbles and barium sulfate. This study improves the performance of previously studied passive radiative cooling.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Thermodynamics
Anirudh Krishna, Jaeho Lee
NANOSCALE AND MICROSCALE THERMOPHYSICAL ENGINEERING
(2018)
Article
Thermodynamics
Marti Sala-Casanovas, Anirudh Krishna, Ziqi Yu, Jaeho Lee
NANOSCALE AND MICROSCALE THERMOPHYSICAL ENGINEERING
(2019)
Article
Multidisciplinary Sciences
Ziqi Yu, Zongqing Ren, Jaeho Lee
SCIENTIFIC REPORTS
(2019)
Article
Physics, Applied
Laia Ferrer-Argemi, Ziqi Yu, Jaeho Lee
JOURNAL OF APPLIED PHYSICS
(2019)
Article
Nanoscience & Nanotechnology
Shiva Farzinazar, Tobias Schaedler, Lorenzo Valdevit, Jaeho Lee
Article
Multidisciplinary Sciences
Anirudh Krishna, Xiao Nie, Andrew D. Warren, Jorge E. Llorente-Bousquets, Adriana D. Briscoe, Jaeho Lee
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Engineering, Manufacturing
Zongqing Ren, Ayed Alqahtani, Nader Bagherzadeh, Jaeho Lee
IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
(2020)
Article
Physics, Applied
Ziqi Yu, Xiao Nie, Anil Yuksel, Jaeho Lee
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Physics, Applied
Xiao Nie, Ziqi Yu, Enrique Jackson, Jaeho Lee
Summary: This study investigates the role of hollow microspheres with varying refractive index and extinction coefficient in determining solar reflectivity. It identifies ceramic materials like Y2O3 with high refractive index and low extinction coefficient as promising for achieving high solar reflectivity. Simulation results show that Y2O3 hollow microspheres with specific diameters can reach high reflectivity levels even at considerable thicknesses, offering new possibilities for applications in thermal management and deep-space technologies.
APPLIED PHYSICS LETTERS
(2021)
Article
Thermodynamics
Jonathan Sullivan, Ziqi Yu, Jaeho Lee
Summary: The study found that the height-to-base ratio of pyramids is a crucial parameter affecting the thermal properties of micropyramid textures, and optimization algorithms can achieve thermal optimization of metallic, ceramic, and polymer materials. Micropyramid textures can significantly impact the solar absorption of nickel, the thermal emission of alumina, and the thermal emission of PDMS.
NANOSCALE AND MICROSCALE THERMOPHYSICAL ENGINEERING
(2021)
Article
Engineering, Manufacturing
Zongqing Ren, Jae Choon Kim, Jaeho Lee
Summary: The study investigates the temporal and spatial interplays of various thermal effects in a holey silicon-based lateral thermoelectric device. Holey silicon with anisotropic thermal conductivities delays lateral diffusion while enabling rapid heat dissipation in the vertical direction, showing promise for dynamic thermal management of on-chip hot spots. The Thomson effect is found to strengthen the supercooling effect in the device.
IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Zongqing Ren, Jiahui Cao, Jungyun Lim, Ziqi Yu, Jae Choon Kim, Jaeho Lee
Summary: In this study, we demonstrate holey silicon-based thermoelectric cooling devices using simple fabrication processes and evaluate their cooling performance using infrared thermography. Our findings indicate that holey silicon can significantly reduce temperature over a large area when the underlying heating stage is set to a higher background temperature.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Nanoscience & Nanotechnology
Shiva Farzinazar, Yueping Wang, Charles Abdol-Hamid Owens, Chen Yang, Howon Lee, Jaeho Lee
Summary: The thermal transport properties of 3D-printed shape memory polymers strongly depend on the shape, solid volume fraction, and temperature, with thermal radiation playing a critical role.
Article
Chemistry, Multidisciplinary
Choyeon Park, Chanil Park, Sungmin Park, Jaeho Lee, Jae-Hak Choi, Yong Seok Kim, Youngjae Yoo
Summary: This study reports the development of a highly efficient passive daytime radiative cooling (PDRC) using a thermoplastic polyurethane (TPU) film with bimodal pores. The TPU film exhibited excellent solar reflectivity and emitted heat efficiently, resulting in ambient cooling. 3D-printed models covered with these TPU films demonstrated superior indoor cooling efficiency compared to commercial paint.