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IEEE Energy Conversion Congress and Exposition, ECCE

作者： Filip Boshkovski Carl Nicholas Zichen Zhang Paul Paret Khai. D. T. Ngo Guo-Quan Lu Department of Materials Science and Engineering Virginia Tech Blacksburg US Bradley Department of Electrical and Computer Engineering CPES Virginia Tech Blacksburg US National Renewable Energy Laboratory Golden CO USA

Double-side cooled power modules are being developed for next-generation traction inverters due to their better heat extraction, lower profile, and lower parasitic inductances. However, due to their rigid structure, they cause reliability concerns arising from high thermo-mechanical stresses at the interconnection joints in the module. In this work, a materials-based approach using rigid encapsulants is presented for reducing thermo-mechanical fatigue. Finite-element thermo-mechanical simulations were performed to examine the effects of the elastic modulus and coefficient of thermal expansion of epoxy-based encapsulants on the bond deformation inside a double-side cooled power module. It was found that a rigid encapsulant with a high modulus of 6.0 GPa or above and a coefficient of thermal expansion around 20 ppm/°C would improve the thermo-mechanical reliability of double-side cooled power modules by decreasing the permanent bond deformation inside the modules by 50-60%.

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Test Methodology Development for Investigating CeRAM at Elevated Temperatures

Test Methodology Development for Investigating CeRAM at Elev...

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IEEE International Conference on Microelectronic Test Structures

作者： A. A. Gruszecki R. Prasad S. V. Suryavanshi G. Yeric C. D. Young Electrical and Computer Engineering Department The University of Texas at Dallas Richardson Texas USA Cerfe Labs Austin Texas USA Department of Materials Science and Engineering The University of Texas at Dallas Richardson Texas USA

Abstract-Correlated electron RAM (CeRAM) device test structures utilizing C-doped NiO were fabricated and electrically characterized to determine functionality in extreme environments. CeRAM devices were demonstrated to repeatedly cycle at temperatures up to 200°C while maintaining a substantial memory window of over 1000 x. Careful selection of compliance current when sweeping the high resistance state (OFF) is required for optimal device performance. The presence of a temperature dependent leakage current in the OFF state results in reducing OFF resistance at elevated temperatures.

关键词： Resistance Performance evaluation Temperature dependence Temperature Random access memory Microelectronics Leakage currents

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Design and Development of a Low-Power Wireless MEMS Lead-Free Piezoelectric Accelerometer System

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IEEE Transactions on Instrumentation and Measurement 2023年 72卷

作者： Li, Cheng-Ying Chen, Ze-Hui Kao, Hsueh-Yu Chang, Sheng-Kai Hsiao, Po-Yu Huang, Yen-Hsiang Huang, Yu-Chieh Chu, Sheng-Yuan Wei, Chia-Ling Liu, Yun-Hui Cheng, Kuang-Wei Tsai, Cheng-Che National Cheng Kung University Department of Electrical Engineering Tainan701 Taiwan National Cheng Kung University Nano-Integrated-Circuit Engineering Program Tainan701 Taiwan Southern Taiwan University of Science and Technology Department of Mechanical Engineering Tainan71005 Taiwan National Cheng Kung University College of Electrical Engineering & Computer Science Department of Electrical Engineering Tainan701 Taiwan Tung Fang Design University School of Application Design Department of Digital Game and Animation Design Kaohsiung82941 Taiwan

In this article, a complete 3-D integrated sensing system intended for practical applications was presented on a printed circuit board (PCB) board, starting with lead-free piezoelectric films deposited using an RF sputtering system, an MEMS structure design/simulation, device fabrication, and a signal processing chip design, including charge- to-voltage transformation, signal amplification, 60-Hz noise rejection, and low-power RF wireless transmission chip for remote monitoring. Both the signal processing chips and the RF wireless transmitter chips were manufactured using the Taiwan Semiconductor Manufacturing Company (TSMC) CMOS process. The piezoelectric coefficient d33 was measured as 27.21 pm/V of the proposed ZnO:Li doped Mg (MLZO) films. To meet the frequency specifications of industrial applications, the ring-structure devices with a 7730-Hz resonance frequency were designed using ANSYS simulation software. There was only a 0.39% deviation compared to the simulation results with the actual experimental data. The measurement results of the proposed system showed that the acceleration detection range was approximately 137 mV/ g (p-p). The voltage-controlled oscillator (VCO) adopted in the wireless transmitter chip had a four-leaf clover structure inductor with two symmetrical axes resulting in better suppression of magnetic field radiation. Finally, this system was applied to industrial spindles, and the normal and abnormal operation information of spindles was successfully and wirelessly monitored. © 1963-2012 IEEE.

关键词： Wireless sensor networks

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Perpendicular Magnetization Switching in Heusler Alloy Films

Perpendicular Magnetization Switching in Heusler Alloy Films

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Magnetic Conference - Short Papers (INTERMAG Short Papers), IEEE International

作者： Lizhu Ren Chenghang Zhou Liang Liu Jingsheng Chen Kie Leong Teo Department of Electrical and Computer Engineering National University of Singapore Singapore Department of Materials Science and Engineering National University of Singapore Singapore School of Physics and Astronomy Shanghai Jiao Tong University Shanghai China

ISBN: (数字)9798350338362

ISBN: (纸本)9798350338379

electrically manipulating magnetic moment by spin-orbit torque (SOT) has great potential applications in magnetic memories and logic devices. Although there have been rich SOT studies on magnetic heterostructures, low interfacial thermal stability and high switching current density still remain an issue. Here, highly textured, polycrystalline Heusler alloy $\text{Mn}_{\mathrm{x}}\text{Pt}_{\mathrm{y}}\text{Ge}$ (MPG) films with various thicknesses are directly deposited on thermally oxidized silicon wafers. The perpendicular magnetization of the MPG single layer can be reversibly switched by electrical current pulses with a magnitude as low as $4.1\times 10^{10}\text{Am}^{-2}$ , as evidenced by both the electrical transport and the magnetic optical measurements. The switching is shown to arise from inversion symmetry breaking due to the vertical composition gradient of the films after sample annealing. The SOT effective fields of the samples are analysed systematically. It is found that the SOT efficiency increases with the film thickness, suggesting a robust bulk-like behaviour in the single magnetic layer. Moreover, a memristive characteristic has been observed due to multi-domain switching property in the single layer MPG device. This work proves that the MPG is a good candidate to be utilized in high-density and efficient MRAM devices and other novel spintronics.

关键词： Magnetic films Torque Optical switches Magnetization Metals Stability analysis Perpendicular magnetic anisotropy

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Subwavelength Fano Resonant Porous Silicon Metasurfaces for Sensing and Dynamic Structural Color

Subwavelength Fano Resonant Porous Silicon Metasurfaces for ...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Saddam Gafsi Estevao Marques Dos Santos Ivan Kravchenko Judson D. Ryckman Holcombe Department of Electrical and Computer Engineering Clemson University Clemson South Carolina USA Oak Ridge National Laboratory Center for Nanophase Materials Science Oak Ridge TN USA

We introduce the design, fabrication, and experimental investigation of subwavelength Fano resonant porous silicon metasurfaces functioning on the principle of guided mode resonance. These metasurfaces exhibit promise... 详细信息

ISBN: (纸本)9798350369311

关键词： Fabrication Lighting Color Lasers and electrooptics Metasurfaces Resonance Sensors Mesoporous materials Porous silicon Electro-optical waveguides

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Long-range dipole-dipole interactions in a plasmonic lattice

Long-range dipole-dipole interactions in a plasmonic lattice

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CLEO: QELS_Fundamental science, QELS 2022

作者： Boddeti, Ashwin K. Guan, Jun Sentz, Tyler Juarez, Xitali Newman, Ward Cortes, Cristian Odom, Teri W. Jacob, Zubin Elmore Family School of Electrical and Computer Engineering Birck Nanotechnology Center Purdue University West LafayetteIN47907 United States Department of Chemistry Northwestern University EvanstonIL60208 United States Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States Intel Corporation BeavertonOR97007 United States Center for Nanoscale Materials Argonne National Laboratory LemontIL60439 United States Department of Chemistry Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States

ISBN: (纸本)9781557528209

We observe long-range dipole-dipole interactions in a plasmonic lattice mediated by collective plasmonic lattice modes. Fluorescence lifetime measurements show density-dependent non-exponential decay dynamics that commensurate to over 800 nm mean nearest-neighbor separation between interacting emitters. © Optica Publishing Group 2022, © 2022 The Author(s)

关键词： Plasmonics

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Shubnikov-de Haas oscillations in coherently strained AlN/GaN/AlN quantum wells on bulk AlN substrates

arXiv

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arXiv 2025年

作者： Chen, Yu-Hsin Encomendero, Jimy Xing, Huili Grace Jena, Debdeep Department of Materials Science and Engineering Cornell University IthacaNY14853 United States School of Electrical and Computer Engineering Cornell University IthacaNY14853 United States Kavli Institute Cornell for Nanoscale Science Cornell University IthacaNY14853 United States

We report the observation of Shubnikov-de Haas (SdH) oscillations in coherently strained, low-dislocation AlN/GaN/AlN quantum wells (QWs), including both undoped and δ-doped structures. SdH measurements reveal a single subband occupation in the undoped GaN QW and two subband occupation in the δ-doped GaN QW. More importantly, SdH oscillations enable direct measurement of critical two-dimensional electron gas (2DEG) parameters at the Fermi level: carrier density and ground state energy level, electron effective mass (m∗ ≈ 0.289 me for undoped GaN QW and m∗ ≈ 0.298 me for δ-doped GaN QW), and quantum scattering time (τq ≈ 83.4 fs for undoped GaN QW and τq ≈ 130.6 fs for δ-doped GaN QW). These findings provide important insights into the fundamental properties of 2DEGs that are strongly quantum confined in the thin GaN QWs, essential for designing nitride heterostructures for high-performance electronic applications. © 2025, CC BY-NC-ND.

关键词： Gallium nitride

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Development of a dual-spectroscopic system to rapidly measure diisopropyl methyl phosphonate (DIMP) decomposition and temperature in a reactive powder environment

arXiv

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arXiv 2024年

作者： Borah, Preetom Alemohammad, Milad Foster, Mark Weihs, Timothy P. Department of Materials Science and Engineering Johns Hopkins University BaltimoreMD21218 United States Hopkins Extreme Materials Institute Johns Hopkins University BaltimoreMD21218 United States Department of Electrical and Computer Engineering Johns Hopkins University BaltimoreMD21218 United States

The development of systems to measure and optimize emerging energetic material performance is critical for Chemical Warfare Agent (CWA) defeat. In order to assess composite metal powder efficacy on CWA simulant defeat, this study documents a combination of two spectroscopic systems designed to monitor the decomposition of a CWA simulant and temperature rises due to combusting metal powders simultaneously. The first system is a custom benchtop Polygonal Rotating Mirror Infrared Spectrometer (PRiMIRS) incorporating a fully customizable sample cell to observe the decomposition of Diisopropyl Methyl Phosphonate (DIMP) as it interacts with combusting composite metal particles. The second is a tunable diode laser absorption spectroscopy (TDLAS) used to monitor increases in background gas temperatures as the composite metal powders combust. The PRiMIRS system demonstrates a very high signal to noise ratio (SNR) at slow timescales (Hz), reasonable SNR when operating at faster timescales (100 Hz), and capabilities of resolving spectral features with a FWHM resolution of 15 cm−1. TDLAS was able to monitor temperature rises between room temperature and 230 ± 5C while operating at 100 Hz. For testing, liquid DIMP was inserted in a preheated stainless steel (SS) cell to generate DIMP vapor and (Al–8Mg):Zr metal powders were ignited in a SS mount with a resistively heated nichrome wire at one end of the cell. The ignited particles propagated across the cell containing DIMP vapor. The path averaged gas temperature in the preheated SS cell rises rapidly (100 ms) and decays slowly ( © 2024, CC BY.

关键词： Zirconium compounds

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Deep learning-based channel estimation for RIS-assisted UAV-enabled wireless communications system

Deep learning-based channel estimation for RIS-assisted UAV-...

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International Conference on Innovation, Communication and engineering (ICICE 2023)

作者： Belayneh A Tesfaw Hsin-piao Lin Getaneh B Tarekegn Rong-Terng Juang Shiann-Shiun Jeng Department of International Graduate Program in Electrical Engineering and Computer Science National Taipei University of Technology Taipei Taiwan Institute of Aerospace and System Engineering National Taipei University of Technology Taipei 10608 Taiwan Department of Electrical and Computer Engineering National Yang-Ming Chiao Tung University Hsinchu 30010 Taiwan Department of Electrical Engineering National Dong Hwa University Hualien Taiwan

ISBN: (数字)9781839539954

Wireless communication via unmanned aerial vehicles (UAVs) has drawn a great deal of attention due to its flexibility in establishing line-of-sight (LoS) communications. However, in complex urban and dynamic environments, the movement of UAVs can be blocked by trees and high-rise buildings that obstruct directional paths. This problem can be effectively addressed by employing reconfigurable intelligent surfaces (RIS). To achieve this goal, accurate channel estimation in RIS-assisted UAV-enabled wireless communications is crucial. This paper proposes an accurate channel estimation model using long short-term memory (LSTM) for a multi-user RIS-assisted UAV-enabled wireless communications system. Simulation results showed that LSTM can effectively improve the channel estimation performance of RIS-assisted UAV-enabled wireless communications.

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A Pseudo-CMOS Bootstrap DIGOTA in a 600nm Flexible IGZO Technology

A Pseudo-CMOS Bootstrap DIGOTA in a 600nm Flexible IGZO Tech...

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International Flexible Electronics Technology Conference (IFETC)

作者： Diogo Sousa João Marcelino Angelo Santos Hugo Viana João Xavier Pedro Barquinha Pedro Toledo Paolo Crovetti Department of Materials Science Nova School of Science and Technology Lisbon Portugal Department of Electrical and Computer Engineering Nova School of Science and Technology Lisbon Portugal Synopsis Lisbon Portugal Dipartimento di Elettronica Politecnico di Torino Turin Italy

ISBN: (数字)9798331529468

ISBN: (纸本)9798331529475

A bstract- The design of a Digital-Based Operational Transconductance Amplifier (DIGOTA) featuring pseudo-CM OS bootstrap inverters integrated is a 600 nm Indium-Gallium-Zinc-Oxide (IGZO) Thin-Film Transistors (TFT) Flexible Integrated Circuits (FlexICs) technology is presented in this paper. Based on post-layout simulations, the proposed DIGOTA operates at 3 V power supply and achieves a DC gain of 33.8 dB and a GBW of 64.9 kHz at 22111W power. Despite maintaining performance comparable to the previous Flexible DIGOTA, this new design occupies 26% less area, requires less logical gates, and enhances the slew rate whilst maintaining reasonable energy efficiency and large signal figures of merit of 14.5 ***/mW and 50.2 ***/***, respectively.

关键词： Power supplies Simulation Logic gates Inverters Thin film transistors Topology Transistors Integrated circuit modeling Transconductance Gain

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