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Optimization of electrode distance and 2D material coverage for PdSe_(2)-based waveguide-integrated photodetectors

science China(Technological sciences) 2025年第3期68卷 319-330页

作者： Tianxun GONG Beilin ZHU Luyu LV Zhengyi LIU Xiaosheng ZHANG School of Integrated Circuit Science and Engineering(Exemplary School of Microelectronics) University of Electronic Science and Technology of ChinaChengdu611731China

Silicon-based waveguide-integrated photodetectors,leveraging their distinct advantages,have become crucial components in integrated photonic *** achieving combined designs of two-dimensional materials and silicon waveguides,understanding the underlying mechanisms and optimizing structural designs remains *** this study,we systematically investigated the impact of electrode distances on the optical loss and photoelectric response of PdSe_(2)-based strip,rib,and slot waveguide-integrated *** electrode distances were determined,leading to significant enhancements in ***,our devices demonstrated high responsivity values of 9.24 A/W(strip),3.34 A/W(rib),and 4.52 A/W(slot)at 1550 *** results represent remarkable enhancements of 481%,237%,and 267%,respectively,compared to the initial unoptimized electrode ***,we found the slot waveguide-integrated photodetector achieves 34%of absorption saturation with PdSe_(2)coverage of approximately 10μm,while the rib waveguide enables 70%absorption(not yet saturated)with PdSe_(2)coverage of 50μ***,we explored the effect of input power on the performance of these photodetectors,finding that lower input optical power yields higher responsivity and external quantum efficiency(EQE),especially for slot waveguide-integrated ***,these detectors exhibit fast optical response rates across the optical communication O to U bands,with strip,rib and slot waveguide-integrated photodetectors demonstrating 3 dB bandwidths of 23.10,14.49,and 14.86 GHz,respectively.

关键词： silicon waveguide photodetector PdSe_(2) electrode distance responsivity

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14-Bit SAR ADC with on-Chip Digital Bubble Sorting Calibration Technology

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Chinese Journal of Electronics 2025年第1期34卷 125-136页

作者： Hua Fan Zhuorui Chen Tongrui Xu Franco Maloberti Qi Wei Quanyuan Feng School of Integrated Circuit Science and Engineering(Exemplary School of Microelectronics) University of Electronic Science and Technology of China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Chongqing Institute of Microelectronics Industry Technology University of Electronic Science and Technology of China Department of Electrical Computer and Biomedical Engineering University of Pavia Department of Precision Instrument Tsinghua University Institute of Microelectronics Southwest Jiaotong University

This article designs a 14-bit successive approximation register analog-to-digital converter（SAR ADC）.A novel digital bubble sorting calibration method is proposed and applied to eliminate the effect of capacitor mismatch on the linearity of the SAR ADC. To reduce the number of capacitors, a hybrid architecture of a high 8-bit binary-weighted capacitor array and a low 6-bit resistor array is adopted by the digital-to-analog（DAC）. The common-mode voltage VCM-based switching scheme is chosen to reduce the switching energy and area of the DAC. The time-domain comparator is employed to obtain lower power consumption. Sampling is performed through a gate voltage bootstrapped switch to reduce the nonlinear errors introduced when sampling the input signal. Moreover, the SAR logic and the whole calibration is totally implemented on-chip through digital integrated circuit（IC） tools such as design compiler, IC compiler, etc. Finally, a prototype is designed and implemented using 0.18 μm bipolar-complementary metal oxide semiconductor（CMOS）-double-diffused MOS 1.8 V CMOS technology. The measurement results show that the SAR ADC with on-chip bubble sorting calibration method achieves the signal-to-noise-and-distortion ratio of 69.75 dB and the spurious-free dynamic range of 83.77 dB.

关键词： Semiconductor device measurement Capacitors Linearity Switches Calibration System-on-chip Frequency measurement Time-domain analysis Sorting Signal to noise ratio

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Strong ferroelectric and luminescence properties of 0-3 type 0.8BaTiO_(3)-0.2CaTiO_(3):Pr^(3+)composite ceramics prepared by cold sintering process

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Journal of Advanced Ceramics 2024年第7期13卷 1002-1010页

作者： Xiaocui Rao Xueling Yang Renbing Sun Peng Du Hai Jiang Yao Huang Laihui Luo Department of Microelectronics Science and Engineering School of Physical Science and TechnologyNingbo UniversityNingbo 315211China College of Materials Science and Engineering Ningbo University of TechnologyNingbo 315016China

0-3 type ferroelectric-phosphor composite ceramics cannot be prepared by the traditional solid-state sintering(SSS)method due to the strong chemical reaction between ferroelectrics and phosphors during high-temperature *** cold sintering process(CSP)may solve this issue by densifying ceramics at ultralow sintering *** this work,dense 0-3 type 0.8BaTiO_(3)-0.2CaTiO_(3):Pr^(3+)(0.8BT-0.2CT:Pr^(3+))binary composite ceramics were fabricated at an ultralow temperature of 225℃via CSP with the Ba(OH)2·8H2O hydrated *** effects of the Ba(OH)_(2)·8H2O content,sintering temperature,and sintering time on the microstructure and densification of the ceramics were *** density of the composite ceramics prepared by the optimized sintering parameters reaches 89%.Both energy-dispersive X-ray(EDX)spectroscopy and X-ray diffraction(XRD)confirm the existence of BT and CT:Pr^(3+)phases in the prepared ceramics.A strong ferroelectric performance is obtained,and the luminescent properties of CT:Pr^(3+)are preserved for the ***,the 0.8BT-0.2CT:Pr^(3+)composite ceramics prepared by CSP have stronger photoluminescence and photo-stimulated luminescence than their counterparts prepared by cold sintering assistance(CSA)and SSS ***,CSP is a promising method for combining luminescent and ferroelectric properties into 0-3 type composite ceramics.

关键词： single-step densification cold sintering composite ceramics ferroelectric luminescence

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Sintering Driven Void Formation in PS@WO3 Core-shell Composites: A Photodegradation Enhancement Strategy

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Current Analytical Chemistry 2024年第8期20卷 557-568页

作者： Yeh, Min Yen You, Ruei Ying Cheng, Po Wen Hwang, Shih-Syuan Hu, Gui-Cheng Chang, Shun Hsyung Department of Microelectronics Engineering National Kaohsiung University of Science and Technology Kaohsiung81157 Taiwan

Background: Polystyrene nanospheres are used as a substrate for the hydrothermal coating of tungsten trioxide (WO3) to form a core-shell composite of PS@WO3. The core-shell structure is used for the next sintering step. This produces porous WO3. The focus of this study is on the role of porous WO3 in enhancing photocatalytic performance. Methods: The hydrothermal method was employed for coating, and the surface morphology, as well as the structural properties of WO3-coated PS spheres, were systematically investigated using SEM and XRD analyses. Additionally, the sintering process was introduced to enhance the material by inducing rupture in the PS sphere core, creating voids that significantly increased the material's surface area. Results: The evaluation of the effect of sintering temperature on photodegradation efficiency highlighted the crucial role of sintering temperature. Un-sintered and 300°C sintered WO3, both having a hexagonal crystalline structure, exhibited superior degradation efficiencies compared to samples sintered at higher temperatures (400°C and 500°C). In particular, the 300°C sintered WO3 outperformed its un-sintered counterpart despite identical crystalline structures. The performance of the PS@WO3 composite was assessed to determine the enhanced role of porous WO3. The porous WO3 obtained, in particular by the sintering of the core-shell PS@WO3 composites at 300°C, showed a remarkable improvement in the degradation efficiency. These composite demonstrated over 95% efficiency within 10 minutes and achieved near complete (100%) degradation for a further 10 minutes, surpassing the performance of pure WO3. It is important to clarify that while the final product was predominantly WO3 after the sintering process, the inclusion of PS served a critical purpose in creating voids during sintering. The PS@WO3 composite structure used as a resource for the preparation of porous WO3, even with a potentially reduced PS composition, has been found to play a

关键词： Tungsten compounds

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A grid-connected eleven-level power conversion interface

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International Journal of Electronics 2025年第5期112卷 949-967页

作者： Wu, Jinn-Chang Chen, Fu-Zen Jou, Hurng-Liahng Chen, Yi-Ting Department of Microelectronics Engineering National Kaohsiung University of Science and Technology Kaohsiung Taiwan Department of Electrical Engineering National Kaohsiung University of Science and Technology Kaohsiung Taiwan

This paper proposes a grid-connected eleven-level power conversion interface (GCELPCI) for renewable power systems. The proposed GCELPCI is composed of a four-port DC-DC power converter (FPDDPC) and an eleven-level inverter (ELI). The FPDDPC combines a boost power converter and a transformer with a turn ratio of 2:1 to generate multiple combinations of the output voltages for the DC bus voltage of the ELI. The ELI integrates an asymmetric voltage technique on a T-type inverter to further convert the DC output voltages of FPDDPC into eleven-level AC voltage. A sinusoidal current is generated by the proposed GCELPCI through the filter inductor and injected into the power grid. Only nine power electronic switches are used in the ELI to generate an eleven-level AC voltage, the number of power electronic switches is reduced to simplify the power circuit. In addition, the capacity of the filter inductor is reduced. A digital signal processor (DSP) and a complex programmable logic device (CPLD) chip are used as the digital controller to complete a hardware prototype to verify the performance of the proposed GCELI. © 2024 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Digital signal processors

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Toward monolithic growth integration of nanowire electronics in 3D architecture: a review

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science China(Information sciences) 2023年第10期66卷 105-134页

作者： Lei LIANG Ruijin HU Linwei YU School of Electronic Science and Engineering Nanjing University School of Physical Science and Technology/Microelectronics Industry Research Institute Yangzhou University

Quasi-one-dimensional(1D) semiconducting nanowires(NWs), with excellent electrostatic control capability, are widely regarded as advantageous channels for the fabrication of high-performance microelectronics, memories... 详细信息

关键词： catalytic growth silicon nanowires electronics monolithic 3D-integration

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Seven-level dual-buck inverter for photovoltaic power generation

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IET Renewable Power Generation 2024年第12期18卷 1880-1892页

作者： Wu, Jinn-Chang Jou, Hurng-Liahng Chen, Fu-Zen Huang, Han-Xin Department of Microelectronics Engineering National Kaohsiung University of Science and Technology Kaohsiung Taiwan Department of Electrical Engineering National Kaohsiung University of Science and Technology Kaohsiung Taiwan

A power processing system (PPS) with a seven-level dual-buck inverter (SLDBI) for a photovoltaic (PV) power generation system is proposed. The PPS is comprised of a boost power converter and an SLDBI. The boost power converter matches the voltage of the PV array with that of the SLDBI and functions as the maximum power point tracker for the PV array. The SLDBI consists of a dual-buck bridge converter (DBBC) and a three-level DC converter (TLDC). The DBBC effectively reduces leakage current in the PPS and prevents current from flowing through the parallel body diode of the power switches, allowing the use of MOSFETs as power electronic switches to enhance power efficiency. The TLDC is structured as a semi-controlled full-bridge system to generate a three-level DC voltage. Besides, the DBBC and TLDC produce a seven-level AC voltage and drive a sinusoidal current to the utility. The SLDBI reduces both the filter inductor size and the switching loss of power switches. With only six power switches, it simplifies the power circuit. A hardware prototype has been built to experimentally verify the proposed PPS. © 2024 The Author(s). IET Renewable Power Generation published by John Wiley & Sons Ltd on behalf of The Institution of engineering and Technology.

关键词： Buck converter

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Hybrid tri-memristor hyperchaotic map and application in Wasserstein Generative Adversarial Nets

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science China(Technological sciences) 2024年第6期67卷 1855-1865页

作者： GU Yang BAO Han YU XiHong HUA ZhongYun BAO BoCheng XU Quan School of Microelectronics and Control Engineering Changzhou UniversityChangzhou213159China School of Computer Science and Technology Harbin Institute of TechnologyShenzhen518055China

Inspired by basic circuit connection methods,memristors can also be utilized in the construction of complex discrete chaotic *** investigate the dynamical effects of hybrid memristors,we propose two hybrid tri-memristor hyperchaotic(HTMH)mapping structures based on the hybrid parallel/cascade and cascade/parallel operations,*** the HTMH mapping structure with hybrid parallel/cascade operation as an example,this map possesses a spatial invariant set whose stability is closely related to the initial states of the *** distributions and bifurcation behaviours dependent on the control parameters are explored with numerical ***,the memristor initial offset-boosting mechanism is theoretically demonstrated,and memristor initial offset-boosting behaviours are numerically *** results clarify that the HTMH map can exhibit hyperchaotic behaviours and extreme multistability with homogeneous coexisting infinite *** addition,an FPGA hardware platform is fabricated to implement the HTMH map and generate pseudorandom numbers(PRNs)with high ***,the generated PRNs can be applied in Wasserstein generative adversarial nets(WGANs)to enhance training stability and generation capability.

关键词： memristor hybrid tri-memristor map spatial invariant set hyperchaos extreme multistability generative adversarial nets

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An Online Maximum Efficiency Point Tracking Technique for Bidirectional Noninverting Buck-Boost Converter over Wide Power Range

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IEEE Transactions on Power Electronics 2024年第7期39卷 7995-8006页

作者： Chen, Fu-Zen Jou, Hurng-Liahng Wu, Jinn-Chang Hung, Hao-Che Luo, Jun-Yao National Kaohsiung University of Science and Technology Department of Electrical Engineering Kaohsiung80778 Taiwan National Kaohsiung University of Science and Technology Department of Microelectronics Engineering Kaohsiung81157 Taiwan

This article presents a novel approach for online tracking of the maximum efficiency point of a bidirectional noninverting buck-boost converter over a wide range of power levels. The proposed technique involves perturbing the phase shift of the gate driver signal and observing the input power and output power to maximize efficiency within both the zero-voltage switching quadrangle mode and the hard switching quadrangle mode. To achieve two modes of operation, a zero-voltage switching detecting circuit is built. This circuit helps detect whether the switching achieves zero voltage switching, sets the phase shift boundary, and adjusts dead time. To evaluate the effectiveness of the proposed approach, a 500 W hardware prototype has been developed. © 1986-2012 IEEE.

关键词： Buck-Boost converter

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Unveiling critical ADHD biomarkers in limbic system and cerebellum using a binary hypothesis testing approach

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Mathematical Biosciences and engineering 2024年第4期21卷 5803-5825页

作者： Chen, Ying Wang, Lele Li, Zhixin Tang, Yibin Huan, Zhan School of Microelectronics and Control Engineering Changzhou University Changzhou213159 China College of Information Science and Engineering Hohai University Changzhou213200 China

Attention deficit hyperactivity disorder (ADHD) is a common childhood developmental disorder. In recent years, pattern recognition methods have been increasingly applied to neuroimaging studies of ADHD. However, these methods often suffer from limited accuracy and interpretability, impeding their contribution to the identification of ADHD-related biomarkers. To address these limitations, we applied the amplitude of low-frequency fluctuation (ALFF) results for the limbic system and cerebellar network as input data and conducted a binary hypothesis testing framework for ADHD biomarker detection. Our study on the ADHD-200 dataset at multiple sites resulted in an average classification accuracy of 93%, indicating strong discriminative power of the input brain regions between the ADHD and control groups. Moreover, our approach identified critical brain regions, including the thalamus, hippocampal gyrus, and cerebellum Crus 2, as biomarkers. Overall, this investigation uncovered potential ADHD biomarkers in the limbic system and cerebellar network through the use of ALFF realizing highly credible results, which can provide new insights for ADHD diagnosis and treatment. © 2024 the Author(s)

关键词： Biomarkers

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