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arXiv 2024年

作者： Wang, Kai-Ni Wang, Haolin Zhou, Guang-Quan Wang, Yangang Yang, Ling Chen, Yang Li, Shuo School of Biological Science and Medical Engineering Southeast University Nanjing China Jiangsu Key Laboratory of Biomaterials and Devices Southeast University Nanjing China Laboratory of Image Science and Technology Southeast University Nanjing China Key Laboratory of Computer Network and Information Integration Southeast University Nanjing China TUGE Healthcare Nanjing China Institute of Medical Technology Peking University Health Science Center China Department of Computer and Data Science Department of Biomedical Engineering Case Western Reserve University United States

CNN-based object detection models that strike a balance between performance and speed have been gradually used in polyp detection tasks. Nevertheless, accurately locating polyps within complex colonoscopy video scenes remains challenging since existing methods ignore two key issues: intra-sequence distribution heterogeneity and precision-confidence discrepancy. To address these challenges, we propose a novel Temporal-Spatial self-correction detector (TSdetector), which first integrates temporal-level consistency learning and spatial-level reliability learning to detect objects continuously. Technically, we first propose a global temporal-aware convolution, assembling the preceding information to dynamically guide the current convolution kernel to focus on global features between sequences. In addition, we designed a hierarchical queue integration mechanism to combine multi-temporal features through a progressive accumulation manner, fully leveraging contextual consistency information together with retaining long-sequence-dependency features. Meanwhile, at the spatial level, we advance a position-aware clustering to explore the spatial relationships among candidate boxes for recalibrating prediction confidence adaptively, thus eliminating redundant bounding boxes efficiently. The experimental results on three publicly available polyp video dataset show that TSdetector achieves the highest polyp detection rate and outperforms other state-of-the-art methods. The code can be available at https://***/soleilssss/TSdetector. Copyright © 2024, The Authors. All rights reserved.

关键词： Object detection

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General Phase Segregation and Phase Pinning Effects in Ln-doped Lead Halide Perovskite with Dual-wavelength Lasing

arXiv

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arXiv 2025年

作者： He, Junyu Luo, Jun Zheng, Weihao Zheng, Biyuan Zhu, Mengjian Liu, Jiahao Fu, Tingzhao Wu, Jing Zhu, Zhihong Wang, Fang Zhuang, Xiujuan School of Physics and Electronics Hunan University Hunan Changsha410082 China National Key Laboratory of Power Semiconductor and Integration Technology Engineering Research Center of Advanced Semiconductor Technology Application of Ministry of Education College of Semiconductors College of Integrated Circuits Hunan University Changsha410082 China College of Advanced Interdisciplinary Studies & Hunan Provincial Key Laboratory of Novel Nano-optoelectronic Information Materials and Devices National University of Defense Technology Changsha410073 China Nanhu Laser Laboratory National University of Defense Technology Changsha410073 China State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences 500 Yu Tian Road Shanghai200083 China

Lead halide perovskites (LHPs) exhibit outstanding optoelectronic properties, making them highly promising for applications in various optoelectronics devices. However, rapid ion migration in LHPs not only undermines device stability but also hinders the development of multi-band composite structures, which are crucial to advancing perovskite bandgap engineering and unlocking novel applications. Here, we introduce a novel and general strategy involving both phase segregation and phase pinning by doping Er3+ into CsPb(XxY1-x)3 (X, Y = Cl, Br, I) microplates via a simple one-step chemical vapor deposition method. The ion migration is effectively suppressed and a variety of stable multi-band composite structures are demonstrated, with diverse dual-band photoluminescence emissions covering the red, green, and blue spectral bands. The corresponding high-performance dual-wavelength lasers have also been fabricated, confirming the stability and high crystalline quality of these multi-band composite structures. In addition, this strategy is extended to the doping of various lanthanide ion and the incorporation of different mixed halides into LHPs. As a result, a series of multi-band composite structures based on LHPs and corresponding dual-wavelength lasers are developed, thereby validating the generality of this strategy. Theoretical calculations clarify the phase segregation and phase pinning mechanism in these LHPs. Our work not only facilitates the stability design of LHPs but also significantly advances the bandgap engineering, thereby contributing to the expansion of their potential applications in the optoelectronic future. Copyright © 2025, The Authors. All rights reserved.

关键词： Phototubes

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Dominant Defect and Microstructure Transformation Engineering for Highly Efficient Low-Bandgap Stannite Solar Cells

SSRN

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SSRN 2024年

作者： Yu, Zixuan Li, Shuoren Li, Chuanhao Huang, Sihao Wang, Yonghao Su, Zhenghua Liang, Guangxing Yan, Chang Guangdong Guangzhou511400 China Institute of Thin Film Physics and Applications Shenzhen Key Laboratory of Advanced Thin Films and Applications Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province State Key Laboratory of Radio Frequency Heterogeneous Integration College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Guangdong Guangzhou511400 China Guangdong-Hong Kong Joint Laboratory for Carbon Neutrality Jiangmen Laboratory of Carbon Science and Technology Guangdong Province Jiangmen529199 China Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology Hong Kong999077 Hong Kong

To meet the requirements of high-efficiency multi-junction tandem, it is imperative to seek cost-effective low-bandgap bottom subcell candidates. The bandgap of Cu2ZnSn(S,Se)4 (CZTSSe) can be effectively narrowed by Cd alloying with the lowest achievable bandgap of 0.87 eV after 60% Zn substitution by Cd. However, the low-bandgap Cu2CdZnSn(S,Se)4 (CCZTSSe) is not efficient, majorly owing to the poor crystallinity of thin films and severe non-radiative recombination. Herein, we report an effective approach to enhance the crystallinity of CCZTSSe via in situ Na-addition in the bottom precursor. Sodium attracts Se within the bottom layers, facilitating the grain growth. Electrical properties are promoted accordingly, with the reduced interface defect densities, modified grain boundaries and superior Ohmic contact at the back interface. The most significant improvement is the dominant defect transformation, from detrimental deep CuCd to benign shallow VCu. These advances enable non-radiative recombination to be greatly suppressed both at the interface and in the bulk. Eventually, an efficiency of 10.48% has been achieved, which is the highest reported efficiency for stannite solar cells. This is a significant step forward on the road to applying CCZTSSe in future tandem technologies. © 2024, The Authors. All rights reserved.

关键词： Grain boundaries

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Three-Layer Matrix Ring Data Center Interconnect Based on FSO technology

Three-Layer Matrix Ring Data Center Interconnect Based on FS...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Jianning Su Qian Kong Xiaowei Lu Liming Liu Zichuan Yi Xinjian Pan School of Electronic and Information Engineering University of Electronic Science and Technology of China Zhongshan Institute Zhongshan China College of Physics and Optoelectronic Engineering Shenzhen University SZU Shenzhen China Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province Shenzhen Key Lab of Micro-Nano Photonic Information Technology State Key Laboratory of Radio Frequency Heterogeneous Integration College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen China

This paper proposes a three-layer grid matrix ring data center interconnect using Free Space Optical Communication as the inter-layer connection technology, which simplifies the wiring complexity and offers more diver... 详细信息

ISBN: (数字)9798350379266

ISBN: (纸本)9798350379273

关键词： Wiring Data centers Optical interconnections Free-space optical communication Asia Optical fiber networks Network architecture Routing Complexity theory Photonics

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A Low Noise 384×288 Uncooled Infrared Imager Based on Phase Difference Modulation

A Low Noise 384×288 Uncooled Infrared Imager Based on Phase...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Xueyou Shi Shanzhe Yu Guangyi Chen Yacong Zhang Zhongjian Chen Wengao Lu Key Laboratory of Microelectronic Devices and Circuits Peking University China Peking University Information Technology Institute (Tianjin Binhai) China

ISBN: (纸本)9781728192017;9781728192024

This paper presents an uncooled infrared imager with flicker noise reduction, which is realized by the proposed phase difference modulation (PDM) method. The PDM method makes noise transfer function (NTF) generate a series of notches to reduce flicker noise. To realize PDM, a high-speed sub-frame readout circuit is proposed. The readout circuit has been manufactured and the output data is processed with FPGA. The measurement results show that the flicker noise power in the frequency range above 10Hz is reduced by 42% compared with traditional method at 60fps full image output rate, and the noise equivalent temperature difference (NETD) is reduced from 40mK to 34mK.

关键词： Temperature measurement Power measurement Phase modulation Transfer functions Frequency measurement Noise measurement 1f noise

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Perpendicular magnetic anisotropy in as-deposited CoFeB/MgO thin films

arXiv

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arXiv 2022年

作者： Lou, Kaihua Xie, Tunan Zhao, Qianwen Jiang, Baiqing Xia, ChaoChao Zhang, Hanying Yao, Zhihong Bi, Chong Key Laboratory of Microelectronic Devices & Integrated Technology Institute of Microelectronics Chinese Academy of Sciences Beijing100029 China University of Chinese Academy of Sciences Beijing100049 China School of Microelectronics University of Science and Technology of China Hefei230026 China

Fabrication of perpendicularly magnetized ferromagnetic films on various buffer layers, especially on numerous newly discovered spin-orbit torque (SOT) materials to construct energy-efficient spin-orbitronic devices, is a long-standing challenge. Even for the widely used CoFeB/MgO structures, perpendicular magnetic anisotropy (PMA) can only be established on limited buffer layers through post-annealing above 300 °C. Here, we report that the PMA of CoFeB/MgO films can be established reliably on various buffer layers in the absence of post-annealing. Further results show that precise control of MgO thickness, which determines oxygen diffusion in the underneath CoFeB layer, is the key to obtaining the as-deposited PMA. Interestingly, contrary to previous understanding, post-annealing does not influence the well-established as-deposited PMA significantly but indeed enhances unsaturated PMA with a thick MgO layer by modulating oxygen distributions, rather than crystallinity or Co- and Fe-O bonding. Moreover, our results indicate that oxygen diffusion also plays a critical role in the PMA degradation at high temperature. These results provide a practical approach to build spin-orbitronic devices based on various high-efficient SOT materials. © 2022, CC BY.

关键词： Buffer layers

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High-speed readout for direct light orbital angular momentum photodetector via photoelastic modulation

arXiv

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arXiv 2025年

作者： Yang, Dehong Xu, Chang Lai, Jiawei Fan, Zipu Liang, Delang Wang, Shiyu Cheng, Jinluo Sun, Dong International Center for Quantum Materials School of Physics Peking University Beijing China Ministry of Education Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Quantum Information and Quantum Optoelectronic Devices School of Physics Xi'an Jiaotong University Xi’an China Key Laboratory for Micro-Nano Physics and Technology of Hunan Province Hunan Institute of Optoelectronic Integration College of Materials Science and Engineering Hunan University Changsha China GPL Photonics Laboratory State Key Laboratory of Luminescence Science and Technology Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun China Collaborative Innovation Center of Quantum Matter Beijing China Frontiers Science Center for Nano-optoelectronics School of Physics Beijing China

Recent progress in direct photodetection of light orbital angular momentum (OAM) based on the orbital photogalvanic effect (OPGE) provides an effective way for on-chip direct electric readout of orbital angular momentum, as well as large-scale integration focal-plane array devices. However, the recognition of OAM order from photocurrent response requires the extraction of circular polarization-dependent response. To date, the operation speed of such detector is currently at the minute level and is limited by slow mechanical polarization modulation and low OAM recognition capability. In this work, we demonstrate that the operation speed can be greatly improved via electrical polarization modulation strategy with photoelasitc modulator accompanied by phase-locked readout approach with lock-in amplifier. We demonstrate an operation speed of up to 1 kHz with this new technology in the mid-infrared region (4 μm) on an OAM detector using multilayer graphene (MLG) as photosensitive material. In principle, with new modulation and readout scheme, we can potentially increase the operation speed to 50.14 kHz with a PEM that operates at a state-of-the-art speed. Our work paves the way toward high-speed operation of direct OAM detection devices based on OPGE effect and pushes such technology to a more practical stage for focal plane array applications. Copyright © 2025, The Authors. All rights reserved.

关键词： Photodetectors

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Regulating Water Molecules via Bioinspired Covalent Organic Framework Membranes for Zn Metal Anodes

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Angewandte Chemie - International Edition 2025年第14期64卷 e202424184页

作者： Zhang, Sida Chen, Jiashu Chen, Weigen Su, Yiwen Gou, Qianzhi Yuan, Ruduan Wang, Ziyi Wang, Kaixin Zhang, Wentao Hu, Xiqian Zhang, Zhixian Wang, Pinyi Wan, Fu Liu, Jie Li, Beibei Wang, Yifei Zheng, Guangping Li, Meng Sun, Jingyu State Key Laboratory of Power Transmission Equipment Technology School of Electrical Engineering National Innovation Center for Industry-Education Integration of Energy Storage Chongqing University Chongqing400044 China Soochow Institute for Energy and Materials Innovation Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow University Suzhou215006 China Department of Mechanical Engineering Hong Kong Polytechnic University Hung Hom Kowloon999077 Hong Kong MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems CQU-NUS Renewable Energy Materials & Devices Joint Laboratory School of Energy and Power Engineering National Innovation Center for Industry-Education Integration of Energy Storage Chongqing University Chongqing400044 China School of Building Services Science and Engineering Xi'an University of Architecture and Technology Xi'an710055 China School of Electrical and Electronic Engineering Chongqing University of Technology Chongqing400054 China Hunan University Changsha410082 China College of Environmental Science and Engineering National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology Beijing University of Technology Beijing100124 China

The Zn metal anode in aqueous zinc-ion batteries (AZIBs) faces daunting challenges including undesired water-induced parasitic reactions and sluggish ion migration kinetics. Herein, we develop three-dimensional covalent organic framework (COF) membranes with bioinspired ion channels toward stabilized Zn anodes. These COFs, featured by zincophilic pyridine-N sites, enable effective regulation of water molecules at the anode-electrolyte interphase. Systematic experimental analysis and theoretical simulations reveal the optimized COF-320N membrane functions as ion pumps, accordingly facilitating Zn2+ transport and inhibiting direct contact between Zn anode and free water molecules. Consequently, the bio-inspired strategy achieves improved Zn2+ transference number (0.61), rapid de-solvation kinetics, and suppressed hydrogen evolution. The assembled Zn||MnO2 pouch cell integrated with COF-320N membrane exhibits favorable electrochemical performances. Such a bioinspired concept for optimizing Zn anodes opens new pathways in developing advanced energy storage devices. © 2025 Wiley-VCH GmbH.

关键词： Manganese oxide

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Temperature-dependent Defect Behaviors in Ferroelectric Hf0.5Zr0.5O2 Thin Film: Re-wakeup Phenomenon and Underlying Mechanisms

Temperature-dependent Defect Behaviors in Ferroelectric Hf0....

引用

International Electron devices Meeting (IEDM)

作者： Xiaopeng Li Jixuan Wu Lu Tai Wei Wei Pengpeng Sang Yang Feng Bo Chen Guoqing Zhao Xuepeng Zhan Xiaolei Wang Masaharu Kobayashi Jiezhi Chen School of Information Science and Engineering Shandong University Qingdao China Key Laboratory of Microelectronic Devices and Integrated Technology Institute of Microelectronics of Chinese Academy of Sciences Beijing China Institute of Industrial Science the University of Tokyo Japan

ISBN: (纸本)9781665489607

Aiming at deep insights into the defect behaviors in the ferroelectric HZO thin film, we present a systematical study on the reliability property of $7\mathrm{~nm}$ HZO capacitor at the high-temperature range $(300\sim 420\mathrm{~K})$. For the first time, the rewakeup phenomenon is observed with cycling operation at high temperatures. By characterization on the switching time, fatigue rate, and leakage currents, the underlying defect-related mechanisms are discussed. It is considered that defects at grain boundaries could be an important reason because the trapped positive charge will induce the dipole pinning during the fatigue stage, but stronger electron injection (higher leakage) can release this pinning and cause the re-wakeup phenomenon. Our results strongly indicate that grain boundary engineering could be the key to ultra-thin HZO optimizations.

关键词： Temperature measurement Grain boundaries Temperature distribution Solid modeling Capacitors Fatigue Data models

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Bioinspired oxygen-locking property electrocatalysts enable highly efficient electrochemical ozone production for sea sand desalination

引用

Journal of Energy Chemistry 2025年 107卷 929-938页

作者： Zhaoyu Chen Ben Zhang Shuyan Lu Guanfeng Xue Qianzhi Gou Jiacheng Wang Ruduan Yuan Juanxiu Xiao Li Li John Wang Meng Li National Innovation Center for Industry-Education Integration of Energy Storage Technology MOE Key Laboratory of Low-Grade Energy Utilization Technologies and Systems CQU-NUS Renewable Energy Materials & Devices Joint Laboratory School of Energy & Power Engineering Chongqing University Chongqing 400044 China Southwest Technology and Engineering Research Institute Chongqing 400039 China State Key Laboratory of Marine Resource Utilization in South China Sea School of Marine Science and Engineering Hainan University Haikou Hainan 570228 China National Key Laboratory of Special Power Supplies National-Municipal Joint Engineering Laboratory for Chemical Process Intensification and Reaction School of Chemistry and Chemical Engineering Chongqing University Chongqing 400044 China Department of Materials Science and Engineering National University of Singapore Singapore 117573 Singapore National University of Singapore (Chongqing) Research Institute Chongqing 401123 China

Electrochemical ozone (O 3 ) production (EOP) faces a critical challenge due to the competitive oxygen evolution reaction (OER), which severely limits ozone yields. Inspired by the oxygen-binding mechanism of heme, we designed a biomimetic catalyst, FePP@SnO 2 @CA, by electrodepositing iron porphyrin (FePP) onto SnO 2 @CA nanosheets, endowing it with an “oxygen-locking property” to suppress competing OER. This catalyst demonstrates exceptional EOP performance, achieving an ozone production rate of 8.9 mmol cm −2 h −1 and a Faraday efficiency (FE) of 20.46% ± 1.6%. DFT calculations confirm that Fe–O 2 interactions stabilize O 2 * intermediates, redirecting the reaction pathway from OER to ozone generation and reducing the O–O coupling energy barrier, thereby enabling thermodynamic selectivity control. In addition, when FePP@SnO 2 @CA is used as a dual-functional material for sea sand desalination, the chlorine removal efficiency can reach 52.7%. This work provides a novel bioinspired strategy for EOP catalyst design and broadens the application potential of FePP@SnO 2 @CA in sustainable technologies.

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