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Annual International Symposium on Reliability Physics

作者： Priyankka Gundlapudi Ravikumar Prasanna Venkatesan Ravindran Khandker Akif Aabrar Taeyoung Song Sharadindu Gopal Kirtania Dipjyoti Das Chinsung Park Nashrah Afroze Mengkun Tian Shimeng Yu Ahmad Ehtesham Islam Suman Datta Souvik Mahapatra Asif Khan School of Electrical and Computer Engineering Georgia Institute of Technology GA USA Institute of Materials GA USA Sensors directorate Air Force Research Laboratory (AFRL) OH USA School of Material Science and Engineering Georgia Institute of Technology GA USA Department of Electrical Engineering Indian Institute of Technology Mumbai India

ISBN: (数字)9798350369762

ISBN: (纸本)9798350369779

In this work, we report the first comprehensive time-dependent dielectric breakdown (TDDB) study on ultra-thin HfO 2 -based ferroelectric under bipolar stress conditions. Here, field cycling is done on 7 nm Hf 0.5 Zr 0.5 O 2 (HZO) capacitors at different temperatures and bipolar stress fields. Despite involving polarization switching and associated large internal electric fields, bipolar cycling of ferroelectric HZO is shown to exhibit similar time-dependent dielectric breakdown acceleration trends to that of traditional dielectrics like SiO 2 . Notably, the temperature acceleration of time-dependent dielectric breakdown shows a linear dependence on the stress field similar to SiO 2 . Further, the field acceleration of time-dependent dielectric breakdown in ferroelectric HZO, while exhibiting functionally similar temperature dependence to that of SiO 2 , demonstrates considerably greater sensitivity to temperature.

关键词： Silicon compounds Temperature sensors Temperature dependence Polarization Temperature Capacitors Switches

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Coherence entropy during propagation through complex media

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Advanced Photonics 2024年第4期6卷 25-35页

作者： Xingyuan Lu Zhuoyi Wang Qiwen Zhan Yangjian Cai Chengliang Zhao Soochow University School of Physical Science and TechnologyJiangsu Key Laboratory of Frontier Material Physics and DevicesSuzhouChina University of Shanghai for Science and Technology School of Optical-Electrical and Computer EngineeringShanghaiChina Shandong Normal University School of Physics and ElectronicsShandong Provincial Engineering and Technical Center of Light ManipulationsShandong Provincial Key Laboratory of Optics and Photonic DeviceJinanChina East China Normal University Joint Research Center of Light Manipulation Science and Photonic Integrated Chip of East China Normal University and Shandong Normal UniversityShanghaiChina

The deformation,flicker,and drift of a light field owing to complex media such as a turbulent atmosphere have limited its practical ***,research on invariants in randomly fluctuated light fields has garnered considerable attention in recent *** is a statistical property of light,while its full and quantitative characterization is ***,we successfully realize the orthogonal modal decomposition of partially coherent beams and introduce the application of coherence entropy as a global coherence characteristic of such randomly fluctuated light *** is demonstrated that coherence entropy remains consistent during propagation in a unitary system by unraveling complex *** representative examples,we study the robustness of coherence entropy for partially coherent beams as they propagate through deformed optical systems and turbulent *** entropy is anticipated to serve as a key metric for evaluating the propagation of partially coherent beams in complex *** study paves the way for a broader application scope of a customized low-coherence light field through nonideal optical systems and complex media.

关键词： complex media propagation invariant modal decomposition orbital angular momentum statistical optics coherence

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Open Catalyst Experiments 2024 (OCx24): Bridging Experiments and Computational Models

arXiv

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arXiv 2024年

作者： Abed, Jehad Kim, Jiheon Shuaibi, Muhammed Wander, Brook Duijf, Boris Mahesh, Suhas Lee, Hyeonseok Gharakhanyan, Vahe Hoogland, Sjoerd Irtem, Erdem Lan, Janice Schouten, Niels Vijayakumar, Anagha Usha Hattrick-Simpers, Jason Kitchin, John R. Ulissi, Zachary W. van Vugt, Aaike Sargent, Edward H. Sinton, David Lawrence Zitnick, C. Meta United States Department of Electrical and Computer Engineering University of Toronto Canada Department of Chemical Engineering Carnegie Mellon University United States Department of Material Science and Engineering University of Toronto Canada Department of Mechanical and Industrial Engineering University of Toronto Canada Canada VSParticle BV Netherlands

The search for low-cost, durable, and effective catalysts is essential for green hydrogen production and CO2 upcycling to help in the mitigation of climate change. Discovery of new catalysts is currently limited by the gap between what AI-accelerated computational models predict and what experimental studies produce. To make progress, large and diverse experimental datasets are needed that are reproducible and tested at industrially-relevant conditions. We address these needs by utilizing a comprehensive high-throughput characterization and experimental pipeline to create the Open Catalyst Experiments 2024 (OCx24) dataset. The dataset contains 572 samples synthesized using both wet and dry methods with X-ray fluorescence and X-ray diffraction characterization. We prepared 441 gas diffusion electrodes, including replicates, and evaluated them using zero-gap electrolysis for CO2 reduction (CO2RR) and hydrogen evolution reactions (HER) at current densities up to 300 mA/cm2. To find correlations with experimental outcomes and to perform computational screens, DFT-verified adsorption energies for six adsorbates were calculated on ∼20,000 inorganic materials requiring 685 million AI-accelerated relaxations. Remarkably from this large set of materials, a data driven Sabatier volcano independently identified Pt as being a top candidate for HER without having any experimental measurements on Pt or Pt-alloy samples. We anticipate the availability of experimental data generated specifically for AI training, such as OCx24, will significantly improve the utility of computational models in selecting materials for experimental screening. © 2024, CC BY.

关键词： Platinum alloys

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An Intelligent Renewable Energy Distribution Strategy for Off-line Fare Meter

An Intelligent Renewable Energy Distribution Strategy for Of...

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International Conference on Power Electronics (ICPE)

作者： Sen-Tung Wu Yong-Ye Lin Feng-Chen Wu Pin-He Liu Yen-Chih Liu Ching-Chun Chuang Department of Electrical Engineering National Formosa University Taiwan Graduate Institute of Electro-Optical and Material Science National Formosa University Taiwan Far Easy Pass LTD Taiwan Computer Science and Information Engineering National Formosa University Taiwan

This paper designs an intelligent solar energy storage system for off-line electronic devices, which collects solar energy through solar panels and stores it in a storage system. The energy storage components include a set of supercapacitor and two sets of lithium-ion battery packs. An intelligent energy storage and discharging optimization strategy is adopted to allocate energy effectively between the supercapacitor and lithium-ion battery packs, which enabling the two sets of lithium-ion battery packs to alternate between energy storage to achieve uninterrupted power supply for the load system. The experimental results show that the total conversion efficiency of the intelligent power distribution system (including the self-powered system) can reach up to 89.32%.

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Understanding ferroelectricity in sputtered aluminum nitride thin films on silicon

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APL materials 2025年第5期13卷

作者： Gogi, Vamshi Kiran Chae, Christopher Barua, Abhijeet Hwang, Jinwoo Jha, Rashmi Department of Electrical and Computer Engineering University of Cincinnati Cincinnati 45221 OH United States Department of Material Science and Engineering Ohio State University Columbus 43210 OH United States Intel Corporation Hillsboro 97124 OR United States

We report ferroelectric switching at room temperature in sub-100 nm aluminum nitride thin films deposited using radio frequency magnetron sputtering in a metal-insulator-metal configuration. The film microstructures were investigated using transmission electron microscopy. Ferroelectric characteristics have been investigated through dynamic hysteresis mode and positive-up-negative-down techniques that underscore contributions from leakage current showing the overestimated remnant polarization (P_r > 100 μC/cm²) values. True ferroelectric switching characterization shows a complete polarization reversal with a P_r of ∼90 μC/cm². The interface trap density (D_it) at the AlN/Si interface in the metal-insulator-semiconductor configuration is estimated to be 6.91 × 10¹³ cm⁻² eV⁻¹ using conductance spectroscopy, indicating flatband voltage (∆V_fb) shifts dominated by charge trapping. © 2025 Author(s).

关键词： Aluminum nitride

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Static Performance and Reliability of 4H-SiC Diodes with P+ Regions Formed by Various Profiles and Temperatures

Static Performance and Reliability of 4H-SiC Diodes with P+ ...

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2022 IEEE International Reliability Physics Symposium, IRPS 2022

作者： Mancini, Stephen A. Yup Jang, Seung Chen, Zeyu Kim, Dongyoung Lynch, Justin Liu, Yafei Raghothamachar, Balaji Kang, Minseok Agarwal, Anant Mahadik, Nadeemullah Stahlbush, Robert Dudley, Michael Sung, Woongje State University of New York Polytechnic Institute College of Nanoscale Science and Engineering AlbanyNY12203 United States Stony Brook University Department of Material Science and Chemical Engineering Stony BrookNY11794 United States The Ohio State University Department of Electrical and Computer Engineering ColumbusOH43210 United States Naval Research Laboratory WashingtonDC20375 United States

ISBN: (纸本)9781665479509

Several designs of 1.2kV-rated 4H-SiC PiN diodes and Junction Barrier Schottky (JBS) diodes have been successfully fabricated with various P+ implantation conditions resulting in different junction profiles. P+ regions were implanted at both room temperature and elevated temperature (600C) to monitor the generation of Basal Plane Dislocations (BPDs) and study their impact on device long term reliability. It was found that, when the dose in the deeper portion of the junction (implemented by high energy implantations) is well suppressed, static and long-term reliability performances of room temperature implanted devices can be maintained similar to those of high temperature implanted devices. © 2022 IEEE.

关键词： Room temperature

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Polygon search algorithm for ultra-compact multifunctional integrated photonics design

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Photonics Research 2024年第7期12卷 1527-1541页

作者： TE DU ZHENG PENG PEIXIN HUANG ZHAOJIAN ZHANG HANSI MA XINPENG JIANG JIE HUANG MINGYU LUO HONGXIN ZOU JUNBO YANG Center of Material Science College of ScienceNational University of Defense TechnologyChangsha 410073China Institute for Quantum Science and Technology College of ScienceNational University of Defense TechnologyChangsha 410073China College of Computer National University of Defense TechnologyChangsha 410073China College of Systems Engineering National University of Defense TechnologyChangsha 410073China Defense Innovation Institute Academy of Military SciencesBeijing 100071China Photonics Research Institute Department of Electrical and Electronic EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China Hunan Key Laboratory of Mechanism and Technology of Quantum Information Changsha 410073China

Ultra-compact multifunctional integrated photonic modules have great practical significance to photonic integrated circuits (PICs).However,the design effect and efficiency of the existing mainstream inverse design algorithms are incompetent when designing these *** analyze their shortcomings in this task,and propose a new,to our knowledge,inverse design algorithm named polygon search (PS) algorithm to address these *** utilize the PS algorithm to design an integrated dual-channel mode-conversion-crossing waveguide *** module integrates three functions:interconversion between TE_(0) and TE_(1),interconversion between TE_(0) and TE_(2),and channel crossing within only a 4μm×4μm footprint,and its performance is verified by experimental *** not only greatly reduces the total footprint of many PICs but also greatly improves their fabricating ***,we propose a PS-designed mode mixer and a PS-designed bending waveguide,and connect them with the integrated modules to form a four-channel crossing-mode-division-multiplexing *** system can provide multiple modes on the basis of channel crossing and transmit the output signal in the same direction in parallel within a single output waveguide,which significantly increases the communication bandwidth and decreases the footprint of *** last,we demonstrate the effect and efficiency advantages of the PS algorithm over several mainstream inverse design algorithms by a comprehensive contrast experiment and explain these advantages in theory from several perspectives.

关键词： waveguide mixer algorithm

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Epilayer on NEAT Grown GaN Schottky Diodes for Radiation Detection

Epilayer on NEAT Grown GaN Schottky Diodes for Radiation Det...

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2023 Transactions of the American Nuclear Society Annual Meeting and Technology Expo, ANS 2023

作者： Remy, Jarod Zhang, Yuxuan Talesara, Vishank Zhao, Hongping Lu, Wu Hashimoto, Tadao Cao, Lei R. Nuclear Engineering Program Department of Mechanical and Aerospace Engineering 281 W. Lane Ave. ColumbusOH43210 United States Department of Electrical and Computer Engineering 281 W. Lane Ave ColumbusOH43210 United States Department of Material Science and Engineering The Ohio State University 281 W. Lane Ave ColumbusOH43210 United States SixPoint Materials Inc 37 Industrial Way STE 106 BuelltonCA United States

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Ultrafast dynamics of exciton-polaritons in 2D semiconductor monolayers

Ultrafast dynamics of exciton-polaritons in 2D semiconductor...

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2023 Optica Nonlinear Optics Topical Meeting, NLO 2023

作者： Liu, Bin Michail, Evripidis He, Guiying Sfeir, Matthew Y. Forrest, Stephen R. Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109 United States Department of Physics Graduate Center City University of New York New YorkNY10016 United States Photonics Initiative Advanced Science Research Center City University of New York New YorkNY10031 United States Department of Physics University of Michigan Ann ArborMI48109 United States Department of Material Science and Engineering University of Michigan Ann ArborMI48109 United States

We observe ultrafast dynamics of exciton-polaritons in 2D semiconductor monolayers with sub-wavelength dielectric photonic structures via non-resonant and resonant pumps, which results from distinct relaxation mechani... 详细信息

ISBN: (纸本)9781957171234

关键词： Monolayers

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Advances in solar energy harvesting integrated by van der Waals graphene heterojunctions

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RSC Advances 2023年第44期13卷 31273-31291页

作者： Le, Top Khac Mai, The-Hung Iqbal, Muhammad Aamir Vernardou, Dimitra Dao, Van-Duong Ponnusamy, Vinoth Kumar Rout, Chandra Sekhar Pham, Phuong V. Faculty of Materials Science and Technology University of Science Ho Chi Minh City700000 Viet Nam Vietnam National University Ho Chi Minh City700000 Viet Nam Department of Physics National Sun Yat-sen University Kaohsiung80424 Taiwan School of Materials Science and Engineering Zhejiang University Hangzhou310027 China Department of Electrical and Computer Engineering School of Engineering Hellenic Mediterranean University Heraklion71410 Greece Faculty of Biotechnology Chemistry and Environmental Engineering Phenikaa University Hanoi100000 Viet Nam Department of Medicinal and Applied Chemistry and Research Center for Precision Environmental Medicine Kaohsiung Medical University Kaohsiung807 Taiwan Department of Medical Research Kaohsiung Medical University Hospital Kaohsiung807 Taiwan Department of Chemistry National Sun Yat-sen University Kaohsiung80424 Taiwan Centre for Nano and Material Sciences Jain University Bangalore562112 India

Graphene has garnered increasing attention for solar energy harvesting owing to its unique features. However, limitations hinder its widespread adoption in solar energy harvesting, comprising the band gapless in the molecular orbital of graphene lattice, its vulnerability to oxidation in oxidative environments, and specific toxic properties that require careful consideration during development. Beyond current challenges, researchers have explored doping graphene with ionic liquids to raise the lifespan of solar cells (SCs). Additionally, they have paid attention to optimizing graphene/Si Schottky junction or Schottky barrier SCs by enhancing the conductivity and work function of graphene, improving silicon's reflectivity, and addressing passivation issues at the surface/interface of graphene/Si, resulting in significant advancements in their power conversion efficiency. Increasing the functional area of graphene-based SCs and designing efficient grid electrodes are also crucial for enhancing carrier collection efficiency. Flaws and contaminants present at the interface between graphene and silicon pose significant challenges. Despite the progress of graphene/Si-based photovoltaic cells still needs to catch up to the efficiency achieved by commercially available Si p-n junction SCs. The low Schottky barrier height, design-related challenges associated with transfer techniques, and high lateral resistivity of graphene contribute to this performance gap. To maximize the effectiveness and robustness of graphene/Si-based photovoltaic cells, appropriate interlayers have been utilized to tune the interface and modulate graphene's functionality. This mini-review will address ongoing research and development endeavors using van der Waals graphene heterojunctions, aiming to overcome the existing limitations and unlock graphene's full potential in solar energy harvesting and smart storage systems. © 2023 The Royal Society of Chemistry.

关键词： Graphene

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