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2024 IEEE Symposium on VLSI Technology and Circuits, VLSI Technology and Circuits 2024

作者： Aabrar, Khandker Akif Park, Hyeonwoo Kirtania, Sharadindu G. Sarkar, Eknath Al Mamun, Md Abdullah Deng, Sunbin Zhang, Chengyang Rayner, Gilbert B. Cho, Kyeongjae Datta, Suman School of Electrical and Computer Engineering Georgia Institute of Technology AtlantaGA30332 United States University of Texas at Dallas Department of Materials Science and Engineering RichardsonTX75080 United States Kurt J. Lesker Company Jefferson HillsPA15025 United States

ISBN: (纸本)9798350361469

We demonstrate a high performance back-end-of-line (BEOL) compatible tungsten (W)-doped In2O3 channel (IWO) dual gate (DG) field-effect transistor (FET) with ultra low-leakage current -15 A/μ m and high ION/IOFF ratio of 5.8× 1011 at 2.5V overdrive (Vov). In addition, the IWO DG FET demonstrates a record low negative bias temperature instability (NBTI) of 7.2mV, record low hot carrier degradation (HCD) of 63mV and a low positive bias temperature instability (PBTI) of 85mV at 1V Vov which makes IWO DG FET a potential candidate for realizing high density embedded-DRAM for last-level cache (LLC). Furthermore, we develop a comprehensive modeling framework for assesing the reliability of amorphous oxide semiconductor (AOS) channel FETs which can provide insights into the threshold voltage (VT) instability mechanisms and help design appropriate mitigation strategies. © 2024 IEEE.

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Optimal first-order algorithms as a function of inequalities

The Journal of Machine Learning Research

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The Journal of Machine Learning Research 2024年第1期25卷 2557-2625页

作者： Chanwoo Park Ernest K. Ryu Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Massachusetts Department of Mathematical Sciences Interdisciplinary Program in Artificial Intelligence Seoul National University Seoul Korea

In this work, we present a novel algorithm design methodology that finds the optimal algorithm as a function of inequalities. Specifically, we restrict convergence analyses of algorithms to use a prespecified subset of inequalities, rather than utilizing all true inequalities, and find the optimal algorithm subject to this restriction. This methodology allows us to design algorithms with certain desired characteristics. As concrete demonstrations of this methodology, we find new state-of-the-art accelerated first-order gradient methods using randomized coordinate updates and backtracking line searches.

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Two-Dimensional Material Inks for the In-Space Manufacturing of Advanced Sensors and Energy Storage 74

Two-Dimensional Material Inks for the In-Space Manufacturing...

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74th International Astronautical Congress, IAC 2023

作者： Kouchi, Fereshteh Rajabi Varghese, Tony V. McKibben, Nicholas Briggs, Ariel E. Manzi, Jacob Mansoor, Naqsh E. Burgoyne, Hailey Busuladzic-Begic, Mia Estrada, Isaac M. Eixenberger, Josh Subbaraman, Harish Estrada, David Micron School of Materials Science and Engineering Boise State University BoiseID83725 United States School of Electrical Engineering and Computer Science Oregon State University CorvallisOR United States Department of Physics Boise State University BoiseID United States

The ability to manufacture custom or replacement sensors, components, circuits, and systems using materials and resources available in space will significantly reduce resupply mission costs. However, the development of new and more multifunctional inks for various printing modalities has, in the past few years, boosted interest in advanced device manufacturing. Colloidal nanoparticles have attracted extensive attention because of their unique and distinct properties compared to their bulk counterparts. These nanoparticles serve as compelling foundational components for a wide range of technologies, including energy conversion and storage, sensing, and electronics, among others. Here, we highlight our recent investigations into the use of nanomaterial inks for additive manufacturing of electronic devices with energy harvesting and energy storage applications. First, we demonstrate the scalable synthesis of stable gold nanoparticle inks with low-temperature sintering using simple chemical washing steps. Multi-printer compatible aqueous nanomaterial inks were formulated with standardization of nanomaterial inks achieving resistivity as low as ~10-6 Ω-m for 400 nm thick films sintered at 250°C. Second, we demonstrate the use of plasma-jet printing (PJP), a gravity-independent, electromagnetic field-assisted printing technology, to deposit colloidal thermoelectric nanoflakes with engineered nanopores onto flexible substrates at room temperature. Our printed films demonstrate an electrical conductivity of 2.5× 103 S/m and a power factor of 70 µW m-1 K-2 at room temperature. Finally, we show synthesis and formulation of Ti3C2Tx MXene ink compatible with aerosol jet printing. The developed ink exhibits consistent printing behaviour with minimal overspray and coffee ring issues on Kapton substrates. Electrochemical studies showed that MXene based printed supercapacitors have an areal capacitance of 26.4 mF/cm-2 at the scan rate of 5 mV s-1 in an organic-based electrolyte. Ou

关键词： 2D inks 2D materials Aerosol Jet Printing Flexible Electronics Inkjet Printing Plasma Jet Printing

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Electrochemical Carbon Dioxide Reduction to Ethylene:From Mechanistic Understanding to Catalyst Surface engineering

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Nano-Micro Letters 2023年第10期15卷 382-415页

作者： Junpeng Qu Xianjun Cao Li Gao Jiayi Li Lu Li Yuhan Xie Yufei Zhao Jinqiang Zhang Minghong Wu Hao Liu Joint International Laboratory on Environmental and Energy Frontier Materials School of Environmental and Chemical EngineeringShanghai UniversityShanghai 200444People’s Republic of China Centre for Clean Energy Technology Faculty of ScienceUniversity of Technology SydneyBroadwaySydneyNSW 2007Australia Department of Electrical and Computer Engineering University of Toronto35 St George StreetTorontoON M5S 1A4Canada

Electrochemical carbon dioxide reduction reaction(CO_(2)RR)provides a promising way to convert CO_(2)to *** multicarbon(C_(2+))products,especially ethylene,are of great interest due to their versatile industrial ***,selectively reducing CO_(2)to ethylene is still challenging as the additional energy required for the C–C coupling step results in large overpotential and many competing ***,mechanistic understanding of the key steps and preferred reaction pathways/conditions,as well as rational design of novel catalysts for ethylene production have been regarded as promising approaches to achieving the highly efficient and selective CO_(2)*** this review,we first illustrate the key steps for CO_(2)RR to ethylene(e.g.,CO_(2)adsorption/activation,formation of~*CO intermediate,C–C coupling step),offering mechanistic understanding of CO_(2)RR conversion to *** the alternative reaction pathways and conditions for the formation of ethylene and competitive products(C_1 and other C_(2+)products)are investigated,guiding the further design and development of preferred conditions for ethylene *** strategies of Cu-based catalysts for CO_(2)RR-ethylene are further summarized,and the correlations of reaction mechanism/pathways,engineering strategies and selectivity are ***,major challenges and perspectives in the research area of CO_(2)RR are proposed for future development and practical applications.

关键词： Key steps in CO_(2)RR-ethylene Preferable reaction pathways Mechanism understanding Surface engineering strategies of Cu-based catalysts

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Advancing electrochemical impedance analysis through innovations in the distribution of relaxation times method

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Joule 2024年第7期8卷 1958-1981页

作者： Maradesa, Adeleke Py, Baptiste Huang, Jake Lu, Yang Iurilli, Pietro Mrozinski, Aleksander Law, Ho Mei Wang, Yuhao Wang, Zilong Li, Jingwei Xu, Shengjun Meyer, Quentin Liu, Jiapeng Brivio, Claudio Gavrilyuk, Alexander Kobayashi, Kiyoshi Bertei, Antonio Williams, Nicholas J. Zhao, Chuan Danzer, Michael Zic, Mark Wu, Phillip Yrjänä, Ville Pereverzyev, Sergei Chen, Yuhui Weber, André Kalinin, Sergei V. Schmidt, Jan Philipp Tsur, Yoed Boukamp, Bernard A. Zhang, Qiang Gaberšček, Miran O'Hayre, Ryan Ciucci, Francesco Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Hong Kong Metallurgical and Materials Engineering Colorado School of Mines Golden80401 United States Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical Engineering Tsinghua University Beijing China Green Energy Storage Trento38123 Italy Department of Manufacturing and Production Engineering Faculty of Mechanical Engineering and Ship Technology Institute of Machine and Materials Technology Gdańsk University of Technology Gdańsk Poland Electrode Design for Electrochemical Energy Systems University of Bayreuth Bayreuth Germany School of Chemistry University of New South Wales Sydney Australia School of Advanced Energy Sun Yat-Sen University Shenzhen China Sustainable Energy Center CSEM Neuchâtel2002 Switzerland Interdisciplinary Faculty of Science and Engineering Shimane University Matsue Japan Centre for Electronic and Optical Materials National Institute for Materials Science Tsukuba Japan Department of Civil and Industrial Engineering University of Pisa Pisa Italy Department of Materials Imperial College London Exhibition Road LondonSW7 2AZ United Kingdom Department of Chemical Engineering Massachusetts Institute of Technology Cambridge02139 United States Electrical Energy Systems University of Bayreuth Bayreuth Germany Ruder Boskovic Institute Zagreb Croatia Department of Materials and Minerals Resources Engineering National Taipei University Taipei Taiwan Finland Johann Radon Institute for Computational and Applied Mathematics Linz Austria School of Science and Engineering Nanjing Tech. University Nanjing China Karlsruhe Germany Department of Materials Science and Engineering University of Tennessee KnoxvilleTN37996 United States Physical Science Division Pacific Northwest National Laboratory RichlandWA99354 United States Systems Engineering for Electrical Energy Storage University of B

Electrochemical impedance spectroscopy (EIS) is widely used in electrochemistry, energy sciences, biology, and beyond. Analyzing EIS data is crucial, but it often poses challenges because of the numerous possible equivalent circuit models, the need for accurate analytical models, the difficulties of nonlinear regression, and the necessity of managing large datasets within a unified framework. To overcome these challenges, non-parametric models, such as the distribution of relaxation times (DRT, also known as the distribution function of relaxation times, DFRT), have emerged as promising tools for EIS analysis. For example, the DRT can be used to generate equivalent circuit models, initialize regression parameters, provide a time-domain representation of EIS spectra, and identify electrochemical processes. However, mastering the DRT method poses challenges as it requires mathematical and programming proficiency, which may extend beyond experimentalists’ usual expertise. Post-inversion analysis of DRT data can be difficult, especially in accurately identifying electrochemical processes, leading to results that may not always meet expectations. This article examines non-parametric EIS analysis methods, outlining their strengths and limitations from theoretical, computational, and end-user perspectives, and provides guidelines for their future development. Moreover, insights from survey data emphasize the need to develop a large impedance database, akin to an impedance genome. In turn, software development should target one-click, fully automated DRT analysis for multidimensional EIS spectra interpretation, software validation, and reliability. Particularly, creating a collaborative ecosystem hinged on free software could promote innovation and catalyze the adoption of the DRT method throughout all fields that use impedance data. © 2024 Elsevier Inc.

关键词： Electrochemical impedance spectroscopy

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Growth of CySi1-x-ySnx Alloys for Low-Cost High-Efficiency Multi-Junction Solar Cells

Growth of CySi1-x-ySnx Alloys for Low-Cost High-Efficiency M...

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IEEE Conference Photovoltaic Specialists (PVSC)

作者： Seyedeh Fahimeh Banihashemian Mohammad Mahmoudi Aboozar Mosleh Hameed A. Naseem Department of Electrical Engineering University of Arkansas Fayetteville AR USA Materials Science & Engineering Program University of Arkansas Fayetteville AR USA

ISBN: (数字)9781665464260

ISBN: (纸本)9781665475822

The future demand for high efficiency solar cell necessitates a breakthrough in development of multi-junction cells. Presently, single junction solar cells dominate the market due to the high production expenses associated with multi-junction variants. This study demonstrates growth and characterization of a new ternary material system of CSiSn that holds promise for fabricating high-efficiency multi-junction solar cells on a Si substrate.

关键词： Photovoltaic systems Tensile strain Photovoltaic cells Optical device fabrication Metals Production Silicon Optical materials Optical films Substrates

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Plasmonic and Interferometric Optical Fiber Sensors for electrical System Monitoring Applications

Plasmonic and Interferometric Optical Fiber Sensors for Elec...

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2023 Active Photonic Platforms, APP 2023

作者： Ohodnicki, P.R. Su, Y.D. Karki, D. Khanikar, T. Naeem, K. Lalam, N. Wuenschell, J.K. Buric, M.P. Wright, R. Department of Mechanical Engineering and Materials Science University of Pittsburgh PittsburghPA15213 United States Department of Electrical and Computer Engineering University of Pittsburgh PittsburghPA15213 United States National Energy Technology Laboratory PittsburghPA15213 United States

ISBN: (纸本)9781510665088

electrical system monitoring applications are of increasing importance given recent trends towards electrification driving adoption of renewables and electric vehicles, for example. Thermal and acoustic signatures play an important role in health monitoring while electrical and magnetic field signatures can provide information about operational state. Optical fiber sensors are of particular interest for electrical system applications because of the compatibility with deployment in electrified systems without concerns for electromagnetic interference (EMI) or additional potential risks due to the presence of electrical sensor wires or power at the sensing location, particularly for medium voltage electrical systems. In this presentation, an overview of recent work in optical fiber-based sensing for electrical asset monitoring applications will be discussed in detail. Plasmonic sensors integrated with engineered nanomaterials will be discussed for thermal and other health monitoring applications while interferometric sensors will be discussed for acoustics and also magnetic fields and electrical current sensing. New directions in fiber-based sensing applications will also be discussed moving into the future. © 2023 SPIE.

关键词： Fiber optic sensors

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Towards electrically-Pumped AlGaN UV-A Lasers with Transparent Tunnel Junctions

Towards Electrically-Pumped AlGaN UV-A Lasers with Transpare...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Ghosh, Arnob Xavier, Agnes M.D.M. Rahman, Sheikh Ifatur Allerman, Andrew Rajan, Siddharth Arafin, Shamsul Department of Electrical and Computer Engineering The Ohio State University ColumbusOH43210 United States Department of Materials Science and Engineering The Ohio State University ColumbusOH43210 United States Sandia National Laboratories AlbuquerqueNM87185 United States

Molecular beam epitaxy-grown GaN/AlGaN-based active regions were optimized by varying quantum-well widths to yield increased photoluminescence intensity at UV-A wavelengths. The optimized gain medium was then used in ... 详细信息

ISBN: (纸本)9781957171258

关键词： Tunnel junctions

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Power Scaling Potential of Single Crystal Fiber Amplifiers 18

Power Scaling Potential of Single Crystal Fiber Amplifiers

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Laser Technology for Defense and Security XVIII 2023

作者： Dong, Liang Kolis, Joseph Ballato, John Holcombe Department of Electrical and Computer Engineering Clemson University ClemsonSC29634 United States Department of Chemistry Clemson University ClemsonSC29634 United States cDepartment of Materials Science and Engineering Clemson University ClemsonSC29634 United States

ISBN: (纸本)9781510661448

The scaling of fiber amplifiers and lasers to higher output powers is of considerable defense and industrial interests. However, above a given threshold power, parasitic nonlinearities arise that limit continued power scaling. Of the myriad of optical nonlinearities, transverse mode instability (TMI), driven by stimulated thermal Rayleigh scattering, stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SBS) are especially problematic as they generally exhibit the lowest threshold powers. Though power-scalable fibers are materially dominated by silica-based glasses, given their low optical losses and industrial maturity, single crystalline fibers have been long been contemplated as intriguing alternatives due to their significantly higher thermal conductivity, especially given recent advances in the growth of cladded single crystal fibers. A few prior efforts have explored the power-scaling potential of single crystal fibers but without considering TMI. Recently, we have developed a TMI model based on combining stimulated thermal Rayleigh scattering and a quasi-3D fiber amplifier model which has been shown to fit experimentally measured TMI thresholds well. Here, TMI is studied in a double-clad single crystal Yb-doped YAG (Y3Al5O12) and lutecia (Lu2O3) fiber lasers. The TMI threshold was found to be significantly higher in single crystal fiber lasers. Power scaling analysis was performed for Yb:silica, Yb:YAG and Yb:Lu2O3 fiber lasers with TMI considered. This work serves as a useful update to earlier works and shine significant lights on fiber and amplifier designs for maximum average powers. © 2023 SPIE.

关键词： Fiber lasers

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Comparison of Torque Generated by In-Plane and Out-of-Plane Anisotropic Magnetorheological Elastomers

Comparison of Torque Generated by In-Plane and Out-of-Plane ...

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

作者： Htoo Wai Htet Ludovico Cestarollo Amal EI-Ghazaly Department of Electrical and Computer Engineering Cornell University Ithaca NY USA Department of Materials Science and Engineering Cornell University Ithaca NY USA

ISBN: (数字)9798350362213

ISBN: (纸本)9798350362220

This study aims to optimize torque generation in Magnetorheological Elastomers (MREs) containing high remanent $\text{Nd}_{2}\text{Fe}_{14}\mathrm{B}$ particles. We explored two approaches to enhancing the overall remanent magnetic moment of the MREs: in-plane (IP) and out-of-plane (OOP) anisotropic arrangements of the magnetic filler particles. While the IP MREs have a slightly higher remanent moment resulting from shape anisotropy, the difference in particle arrangement established different effective bending moduli such that the IP MREs exhibit a lower net actuation in a magnetic field compared to OOP MREs. This surprising behavior indicates the importance of a synergism between both the magnetic and mechanical properties for maximizing torque production.

关键词： Torque Shape Magnetic anisotropy Elastomers Production Anisotropic Magnetic moments

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