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SSRN 2022年

作者： Hu, Chunfeng Zou, Zhongfei Wang, Mingxiang Qu, Xinping Co. Ltd Suzhou215301 China The School of Electronic and Information Engineering Soochow University Suzhou215006 China State Key Laboratory of ASIC and System School of Microelectronics Fudan University Shanghai200433 China

Dual active layer (DAL) Mg-doped InZnO thin film transistors (TFTs) are fabricated with ultralow usage of the rare metal In. Optimized DAL MIZO TFTs are obtained by adjusting In-doping, Mg content, and the thickness of two active layers. Compared with conventional single active layer TFTs, the DAL MIZO TFTs showed improved performance in terms of carrier mobility, threshold voltage (Vth), ON-state current (ION), and leakage current (IOFF). The front channel near the gate oxide has a lower Mg-doping and a higher In-doping compared with that of back channel, providing a high carrier concentration (ne) to increase ION . The back channel has a higher Mg-doping and a lower In-doping, providing a low ne to suppress IOFF. Furthermore, the heterojunction potential barrier formed between the two channel layers also helps to suppress the I OFF of the DAL TFTs. © 2022, The Authors. All rights reserved.

关键词： Thin film transistors

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Nonvolatile electrically reconfigurable silicon photonics enabled by back-end-of-line integration of phase change materials 12

Nonvolatile electrically reconfigurable silicon photonics en...

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Optoelectronic Devices and Integration XII 2023

作者： Li, Junying Wei, Maoliang Xu, Kai Tang, Bo Yun, Yiting Zhang, Peng Wu, Yingchun Bao, Kangjian Lei, Kunhao Chen, Zequn Ma, Hui Sun, Chunlei Liu, Ruonan Li, Ming Li, Lan Lin, Hongtao State Key Laboratory of Modern Optical Instrumentation Key Laboratory of Micro-Nano Electronics and Smart System of Zhejiang Province College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou310024 China Institute of Microelectronics of the Chinese Academy of Sciences Beijing100029 China Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of Engineering Westlake University Zhejiang Hangzhou310030 China State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China

ISBN: (纸本)9781510667778

Nonvolatile light-field manipulation via electrically-driven phase transition of chalcogenide phase change materials (PCMs) is regarded as one of the most powerful solutions to low-power-consumption and compact integrated reconfigurable photonics. However, before the breakthrough in large-scale integration approaches linked to wafer foundries, phase-change non-volatile reconfigurable photonics could hardly see their widespread practical applications. Here we demonstrate nonvolatile photonic devices fabricated by back-end-of-line (BOEL) integration of PCMs into the commercial silicon photonics platform. A narrow trench etched into the BOEL dielectric layer exposed the waveguide core and allowed for the direct deposition of various PCM films on the waveguide in the functional areas. Fine-tuning the nonvolatile phase transition of Sb2Se3 via a PIN microheater was verified by realizing the post-fabrication trimming of silicon photonic devices. Our work highlights a reliable platform for large-scale PCM-integrated photonics and validates its precise nonvolatile reconfigurability. © 2023 SPIE.

关键词： Phase change materials

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Research on Supply Chain Traceability system Based on Semantic Multi-Blockchain and Pre-OnChain Data Verification

Research on Supply Chain Traceability System Based on Semant...

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IEEE/ACM Int'l Conference on & Int'l Conference on Cyber, Physical and Social Computing (CPSCom) Green Computing and Communications (GreenCom)

作者： Lulu Li Huan Qu Wei Wang Junyu Wang Zhihui Wang Bin Nong School of Computer Science Fudan University Shanghai China State Key Laboratory of ASIC&System Fudan University Shanghai China Department of IoT Zhuhai Fudan Innovation Institute Zhuhai China

Blockchain-based supply chain traceability systems are characterized by decentralization, transparency, and immutability. However, if all nodes replicate the entire ledger, it would result in significant storage overhead. Some nodes might be forced to exit the system due to inadequate storage resources. Additionally, the chained structure of blockchain implies that query delays will significantly increase as the volume of data grows. Furthermore, the immutable nature of blockchain demands a higher level of accuracy in the original data within the traceability system, as once erroneous data is uploaded to the blockchain, it cannot be altered or removed. In this paper, First, we analyze the requirements of supply chain business scenarios and the characteristics of traceability data. Then, we propose a semantic multi-chain storage architecture, categorizing data from different business entities into respective semantic side-chains, thereby addressing issues such as insufficient node storage and on-chain data explosion. Second, We introduce a semantic aggregation storage optimization technique, consolidating data with identical semantic keys into a single block, thereby reducing the number of blocks accessed during queries and improving query efficiency. Lastly, for the first time, we introduce a pre-onchain data reliability verification mechanism based on data characteristics. The results indicate that the proposed solution can offer reduced on-chain storage space, faster query speeds, and enhanced reliability of the original data sources.

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Round-Trip Sensitivity-Bandwidth Optimization and Characterization of High-Frequency PMUTs

Round-Trip Sensitivity-Bandwidth Optimization and Characteri...

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IEEE International Symposium on Applications of Ferroelectrics (ISAF)

作者： Leming He Ning Lv Weijiang Xu Yan Wang Junyan Ren State Key Laboratory of ASIC and System School of Microelectronics Fudan University Shanghai China UMR 8520-IEMN- Institut d’Electronique de Microélectronique et de Nanotechnologie Univ. Polytechnique Hauts-de-France CNRS Univ. Lille Valenciennes France

Piezoelectric micromachined ultrasonic transducers (PMUTs) are fabricated with Micro-Electro-Mechanical systems (MEMS) processes. They have advantages such as high uniformity and density, high flexibility in array configuration, and compatibility with integrated circuits. However, PMUTs generally have bottleneck issues with round-trip sensitivity, which restrict the improvement of acoustical imaging resolution. In this work, a round-trip modeling and optimization method is proposed to better analyze the round-trip sensitivity and solve the round-trip bottleneck problem of the PMUTs. Besides, the COMSOL livelinked with MATLAB to greatly simplify the calculation complexity is used to eliminate the influence of geometric parameters on center frequency variations and sweep several radii and thickness parameters.

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A novel contact engineering method for transistors based on two-dimensional materials

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Journal of Materials Science & Technology 2021年第10期69卷 15-19页

作者： Yaochen Sheng LuFang Zhang Feng Li Xinyu Chen Zhijian Xie Haiyan Nan Zihan Xu David Wei Zhan Jianhao Chen Yong Pu Shaoqing Xiao Wenzhong Bao State Key Laboratory of ASIC and System Shanghai Institute of Intelligent Electronics&SystemsSchool of MicroelectronicsFudan UniversityShanghai 200433China Engineering Research Center of IoT Technology Applications(Ministry of Education) Department of Electronic EngineeringJiangnan UniversityWuxi 214122China International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China New Energy Technology Engineering Laboratory of Jiangsu Province&School of Science Nanjing University of Posts and TelecommunicationsNanjing 210023China Six Carbon Tech ShenzhenShenzhen 518106China

Contact engineering is of critical importance for two-dimensional(2D)transition metal dichalcogenide(TMD)-based ***,there are only a few solutions to overcome this obstacle because of the complexity of the TMD-contact *** this work,we propose a novel method using a soft plasma treatment followed by the seamless deposition of a metal electrode to reduce the contact resistance of MoS_(2)field effect transistors(FETs).The treated FETs exhibit three times higher mobility than the control FETs without plasma *** soft plasma treatment can remove the facial sulfur atoms and expose the middle Mo atoms so that they come into direct contact with the metal electrode,thus greatly improving the contact ***-principles calculation is also performed to support the experimental *** potentially scalable strategy can be extended to the whole family of TMD based FETs to provide a possible route of device processsing technology for 2D device application.

关键词： Electrical contact resistance MoS_(2) Plasma

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Multi-scale and Bi-path Method Based on Image Entropy and CNN for Fast CU Partition in VVC

Multi-scale and Bi-path Method Based on Image Entropy and CN...

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International Conference on Imaging, Signal Processing and Communication (ICISPC)

作者： Yifan Zhai Xiao Yan Yibo Fan Takeshi Ikenaga Graduate School of Information Production and Systems Waseda University Kitakyushu Japan State Key Laboratory of ASIC and System Fudan University Shanghai China

ISBN: (纸本)9781665454810

The latest video compression standard Versatile Video Coding standard (H.266/VVC) has been released by Joint Video Exploration Team. It reaches higher encoding efficiency than the previous standard H.265/HEVC, but it takes more computational resources because it introduces lots of complex tools. Especially the new partition structure named quadtree with nested multi-type tree (QTMT). In that case, a multi-scale bi-path method based on image entropy and CNN for fast partition is proposed in this paper. Considering that CU with different sizes contain different amounts of information, the proposed method sets two paths for CU with large size (32x32) and CU with small size (16x8,8x8,16x16) respectively. The homogeneous area tends to use a larger CU as a whole to encode. So, for large CU, the method uses image entropy and gradient feature to make a partition decision, In HEVC, the CU can only be quartered by Quaternary tree (QT) with a same width and height of 64,32,16 or 8. Besides, large CU contains more specific spatial information, so more concrete partition result is given by a two-step binary classification framework, the method first decides if the CU uses horizontal partition mode or vertical partition mode by gradient distribution, then decide if current CU uses binary partition mode or not by sub-area similarity. Compared to anchor VTM-13.0, the method saves the encoding time by 54.647% on average at the cost of only a 2.27% BDBR increase.

关键词： Video coding Deep learning Costs Imaging Vegetation Video compression Signal processing

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A 26-38GHz Ultra-Wideband Balanced Frequency Doubler in 0.15µ m GaAs pHEMT Process

A 26-38GHz Ultra-Wideband Balanced Frequency Doubler in 0.15...

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IEEE Asia-Pacific Conference on Circuits and systems

作者： Wenyang Liu Tianxiang Wu Tianyang Yan Fan Yang Yong Chen Shunli Ma State Key Laboratory of ASIC and System School of Microelectronicsline Fudan University Shanghai China State-Key Laboratory of Analog and Mixed-Signal VLSI and IME/ECE-FST University of Macau Macao China

This paper reports the analysis and design of a 26-38GHz balanced frequency doubler. The balanced frequency doubler eliminates odd harmonics by using the characteristics of the circuit. We employ a cascade of two-stage amplifiers to increase output power, and a transformer-based magnetic-coupled resonator (MCR) matching technique to widen the bandwidth. Besides, the transformer can realize the single-ended to differential conversion without penalizing additional power consumption. The frequency doubler is designed in a 0.15 µm GaAs pHEMT process. Post-layout simulation results show that the output power is greater than 10dBm over 26-38GHz, and the fundamental-to-harmonic suppression is greater than 15 dBc. The DC power consumption is 23 mA at a 5-V supply. The chip area is 0.75×1.55 mm 2 .

关键词： Power demand PHEMTs Gallium arsenide Resonant frequency Power amplifiers Bandwidth Transformers

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Asynchronous Batch Constrained Multi-Objective Bayesian Optimization for Analog Circuit Sizing

Asynchronous Batch Constrained Multi-Objective Bayesian Opti...

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Asia and South Pacific Design Automation Conference

作者： Xuyang Zhao Zhaori Bi Changhao Yan Fan Yang Ye Lu Dian Zhou Xuan Zeng State Key Laboratory of Integrated Chips & System Fudan University China School of Microelectronics Fudan University China School of Information Science and Technology Fudan University China Department of Electrical Engineering University of Texas at Dallas U.S.A

For analog circuit sizing, constrained multi-objective optimization is an important and practical problem. With the popularity of multi-core machines and cloud computing, parallel/batch computing can significantly improve the efficiency of optimization algorithms. In this paper, we propose an Asynchronous Batch Constrained Multi-Objective Bayesian Optimization algorithm (ABCMOBO). Since the performances below the specifications are worthless, we adopt a dynamic reference point selection on the expected hypervolume improvement acquisition function for constraint handling. To save the time of waiting for all the simulations in the same batch to complete, ABCMOBO asynchronously evaluates the next candidate point if there is an idle worker. The experimental results quantitatively demonstrate that our proposed algorithms can reach 3.49 ~ $8.18 \times$ speed-up with comparable optimization results compared to the state-of-the-art asynchronous/synchronous batch multi-objective optimization methods.

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Improved Bundle Adjustment Based on ADMM 6th

Improved Bundle Adjustment Based on ADMM

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6th International Conference on Life system Modeling and Simulation, LSMS 2020, and 6th International Conference on Intelligent Computing for Sustainable Energy and Environment, ICSEE 2020

作者： Ma, Ruijie Jiang, Xin Liu, Jingjing Wang, Mingyu Li, Wenhong You, Ting State Key Laboratory of ASIC and System School of Microelectronics Fudan University Shanghai China Key Laboratory of Air-driven Equipment Technology of Zhejiang Province Quzhou University Quzhou China

ISBN: (纸本)9789813363779

Bundle adjustment plays an significant role in SLAM (simultaneous localization and mapping), which is utilized in both front-end visual odometry and global back-end optimization. In many SLAM systems, bundle adjustment is employed to estimate the location of 3D landmarks and 6 DOF camera pose. However, as the dimension of the optimization variable increases, bundle adjustment consumes more and more time in SLAM, mainly in the iterative process. In this paper, an improved algorithm for this large scale bundle adjustment problem has been proposed. Firstly, according to the pose consensus, the classic algorithm ADMM (alternating direction method of multipliers) is introduced into the bundle adjustment problem. Secondly, for the non-convex optimization problem, the sub problem optimization method is introduced, and convergence and stopping criteria of the algorithm are discussed. Finally, the semi-dense direct method visual odometry for verification is implemented, and the experiments prove that the improved bundle adjustment algorithm has a speed advantage and can be applied to BAL (bundle adjustment in the large) problem. © 2020, Springer Nature Singapore Pte Ltd.

关键词： Iterative methods

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3d Tubular Graphene Sponge/Pedot:Pss Based Stretchable and Flexible Device for Noninterfering Pressure-Temperature Detection

SSRN

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SSRN 2023年

作者： Zhao, Zeng-Cai Ding, Si-Tong Wen, Xiao-Hong Ma, Hong-Ping Zhao, Xue-Feng School of Science Hangzhou Dianzi University Hangzhou310018 China State Key Laboratory of ASIC and System Shanghai Institute of Intelligent Electronics & Systems School of Microelectronics Fudan University Shanghai200433 China Institute of Wide Bandgap Semiconductors and Future Lighting Academy for Engineering & Technology Fudan University Shanghai200433 China

Skin-like pressure- and temperature-sensing capabilities are two important indicators for artificial human skins and flexible wearable sensors. However, artifact interference between measured signals has always been the technical difficulty in realizing multi-parameter real-time and highly sensitive monitoring. Herein, a stretchable and flexible pressure-temperature sensitive device based on 3D tubular graphene sponge/PEDOT:PSS composite is designed and fabricated. The hybrid Ag NWs/CNTs composite based embedded stretchable electrodes is selected as the signal transmission lines, which had the ability to resist tensile strain failure. The pressure-resistance module and the temperature-voltage module exhibits distinguishable features of detecting pressure and temperature stimulus simultaneously. The detection sensitivity of pressure and temperature stimuli is 43 kPa-1 and 24.5 μV/K, respectively. Moreover, a 3×3 sensor array is demonstrated to verify its monitoring effects in static and dynamic surroundings, illustrating its promising applications, such as health monitoring components, biomimetic soft wearable devices and human-machine interaction. © 2023, The Authors. All rights reserved.

关键词： Graphene

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