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Optoelectronics Letters 2025年第3期21卷 149-154页

作者： LI Wenqiang WU Min LI Weijun HAO Meilan YU Lina Ann Lab Institute of Semiconductors Chinese Academy of Sciences School of Electronic Electrical and Communication Engineering & School of Integrated Circuits University of Chinese Academy of Sciences Beijing Key Laboratory of Semiconductor Neural Network Intelligent Sensing and Computing technology

In recent years, machine learning (ML) techniques have been shown to be effective in accelerating the development process of optoelectronic devices. However, as"black box"models, they have limited theoretical interpretability. In this work, we leverage symbolic regression (SR) technique for discovering the explicit symbolic relationship between the structure of the optoelectronic Fabry-Perot (FP) laser and its optical field distribution, which greatly improves model transparency compared to ML. We demonstrated that the expressions explored through SR exhibit lower errors on the test set compared to ML models, which suggests that the expressions have better fitting and generalization capabilities.

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Two-dimensional lateral magnetic tunnel junction with ultrahigh tunneling magnetoresistance

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Nano Research 2025年第2期18卷 958-964页

作者： Qiu-Qiu Li Zhi-Fu Duan Wen-Wen Liu Rong Yang Bo Li Ke-Qiu Chen Changsha Semiconductor technology and Application Innovation Research institute College of Semiconductors(College of Integrated Circuits)Hunan UniversityChangsha 410082China Department of Applied Physics School of Physics and ElectronicsHunan UniversityChangsha 410082China Research institute of Hunan University in Chongqing Chongqing 401120China Shenzhen Research institute of Hunan University Shenzhen 518063China

Giant tunneling magnetoresistance(TMR)has always been a pursuit in the research of magnetic tunnel junctions(MTJ).Two-dimensional(2D)magnetic materials have been used to construct lateral MTJ with high *** we investigated the crystal structure and magnetic property of CrSI monolayer,and found that it is a ferromagnetic semiconductor with a Curie temperature of about 180 *** CrSI monolayer with Li adsorption(Li-CrSI)show ferromagnetic half-metallic with a high Curie temperature of 300 *** we designed a lateral Li CrSI/CrSI/Li-CrSI monolayer *** TMR of the MTJs along b transport direction is 3 orders of magnitude times larger than that of the a transport direction,which should result from the different spin filtering ability along the two *** TMR of b transport direction in the MTJ is 7.67×10^(14),which is significantly higher than that of any reported lateral MTJs based on 2D *** results provide a promising avenue for designing lateral MTJs with giant TMR and high Curie temperature.

关键词： two-dimensional materials magnetic tunnel junctions CrSI monolayer tunneling magnetoresistance Li atom adsorption

Signal acquisition of brain-computer interfaces:A medical-engineering crossover perspective review

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Fundamental Research 2025年第1期5卷 3-16页

作者： Yike Sun Xiaogang Chen Bingchuan Liu Liyan Liang Yijun Wang Shangkai Gao Xiaorong Gao Department of Biomedical Engineering Tsinghua UniversityBeijing 100084China institute of Biomedical Engineering Chinese Academy of Medical Sciences and Peking Union Medical CollegeTianjin 300192China Center for Intellectual Property and Innovation Development China Academy of Information and Communications TechnologyBeijing 100161China institute of semiconductors Chinese Academy of SciencesBeijing 100083China

Brain-computer interface(BCI)technology represents a burgeoning interdisciplinary domain that facilitates direct communication between individuals and external *** efficacy of BCI systems is largely contingent upon the progress in signal acquisition *** paper endeavors to provide an exhaustive synopsis of signal acquisition technologies within the realm of BCI by scrutinizing research publications from the last ten *** review synthesizes insights from both clinical and engineering viewpoints,delineating a comprehensive two-dimensional framework for understanding signal acquisition in *** delineate nine discrete categories of technologies,furnishing exemplars for each and delineating the salient challenges pertinent to these *** review furnishes researchers and practitioners with a broad-spectrum comprehension of the signal acquisition landscape in BCI,and deliberates on the paramount issues presently confronting the *** enhancements in BCI signal acquisition should focus on harmonizing a multitude of disciplinary *** equilibrium between signal fidelity,invasiveness,biocompatibility,and other pivotal considerations is *** doing so,we can propel BCI technology forward,bolstering its effectiveness,safety,and depend-ability,thereby contributing to an auspicious future for human-technology integration.

关键词： Brain-computer interface Signal acquisition technologies Surgery Detection Human computer interaction

Recent progress on elemental tellurium and its devices

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Journal of semiconductors 2025年第1期46卷 91-106页

作者： Jiachi Liao Zhengxun Lai You Meng Johnny C.Ho Department of Materials Science and Engineering City University of Hong KongKowloonHong Kong 999077China Changsha Semiconductor technology and Application Innovation Research institute College of Semiconductors(College of IntegratedC ircuits)Hunan UniversityChangsha 410082China institute for Materials Chemistry and Engineering Kyushu UniversityFukuoka 8168580Japan State Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloonHong Kong 999077China

The rapid advancement of information technology has heightened interest in complementary devices and *** p-type semiconductors often lack sufficient electrical performance,thus prompting the search for new materials with high hole mobility and long-term *** tellurium(Te),featuring a one-dimensional chiral atomic structure,has emerged as a promising candidate due to its narrow bandgap,high hole mobility,and versatility in industrial applications,particularly in electronics and renewable *** review highlights recent progress in Te nanostructures and related devices,focusing on synthesis methods,including vapor deposition and hydrothermal synthesis,which produce Te nanowires,nanorods,and other *** applications in photodetectors,gas sensors,and energy harvesting devices are discussed,with a special emphasis on their role within the internet of things(IoT)framework,a rapidly growing field that is reshaping our technological *** prospects and potential applications of Te-based technologies are also highlighted.

关键词： elemental tellurium photodetector field-effect transistor gas sensor energy harvesting device

Design strategies and insights of flexible infrared optoelectronic sensors

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Journal of semiconductors 2025年第1期46卷 21-56页

作者： Yegang Liang Wenhao Ran Dan Kuang Zhuoran Wang School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081China

Infrared optoelectronic sensing is the core of many critical applications such as night vision,health and medication,military,space exploration,*** including mechanical flexibility as a new dimension enables novel features of adaptability and conformability,promising for developing next-generation optoelectronic sensory applications toward reduced size,weight,price,power consumption,and enhanced performance(SWaP^(3)).However,in this emerging research frontier,challenges persist in simultaneously achieving high infrared response and good mechanical deformability in devices and integrated ***,we perform a comprehensive review of the design strategies and insights of flexible infrared optoelectronic sensors,including the fundamentals of infrared photodetectors,selection of materials and device architectures,fabrication techniques and design strategies,and the discussion of architectural and functional integration towards applications in wearable optoelectronics and advanced image ***,this article offers insights into future directions to practically realize the ultra-high performance and smart sensors enabled by infrared-sensitive materials,covering challenges in materials development and device micro-/*** for scaling these techniques across fabrication,performance,and integration are presented,alongside perspectives on potential applications in medication and health,biomimetic vision,and neuromorphic sensory systems,etc.

关键词： flexible infrared sensor infrared-sensitive materials device architectures fabrication techniques design strategies

Advances in flexible weak-light detectors based on perovskites:preparation,optimization,and application

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Journal of semiconductors 2025年第1期46卷 144-164页

作者： Yaqian Yang Ying Li Di Chen Guozhen Shen School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081China

Photodetectors with weak-light detection capabilities play an indispensable role in various crucial fields such as health monitors,imaging,optical communication,and ***,the detection of weak light signals is often severely interfered by multiple factors such as background light,dark noise and circuit noise,making it difficult to accurately capture *** traditional technologies like silicon photomultiplier tubes excel in sensitivity,their high cost and inherent fragility restrict their widespread *** this background,perovskite materials have rapidly emerged as a research focus in the field of photodetection due to their simple preparation processes and exceptional optoelectronic *** only are the preparation processes of perovskite materials straightforward and cost-effective,but more importantly,they can be flexibly integrated into flexible and stretchable *** characteristic significantly compensates for the shortcomings of traditional rigid electronic devices in specific application scenarios,opening up entirely new possibilities for photodetection ***,recent advances in perovskite light detection technology are ***,the chemical and physical properties of perovskite materials are discussed,highlighting their remarkable advantages in weak-light ***,the review systematically organizes various preparation techniques of perovskite materials and analyses their advantages in different application ***,from the two core dimensions of performance improvement and light absorption enhancement,the key strategies of improving the performance of perovskite weak-light photodetectors are ***,the review concludes with a brief summary and a discussion on the potential challenges that may arise in the further development of perovskite devices.

关键词： perovskite weak-light photodetector flexible

Investigation of edge states variation in valley photonic crystals by modulating the refractive index of domain walls

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Optoelectronics Letters 2025年第3期21卷 160-166页

作者： ZHANG Run ZHONG Xingli LIN Zhongxi QIU Weibin SU Hui Key Laboratory of Optoelectronic Materials Chemistry and Physics Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices Fujian Institute of Research on the Structure of Matter Chinese Academy of Science University of Chinese Academy of Sciences Chinese Academy of Sciences College of Information Science and Engineering Huaqiao University Fujian Science & technology Innovation Laboratory for Optoelectronic Information of China

Realizing the valley Hall effect by breaking the spatial inversion symmetry of photonic systems has become a cutting-edge field of micro-nano-optics, since the valley degree of freedom was introduced into photonic system. Various novel devices based on the domain walls of the valley photonic crystals have also been demonstrated. In this article,we investigate the variation of edge states by the modulation of refractive index within the domain walls, and the geometric difference between the dielectric columns of the sublattices. Straight photonic crystal waveguides with three types of domain walls (bearded, zigzag, armchair) are constructed. Simulation results show that the creation of a double-edge state in the band diagram results in two windows of stable transmission in tunable bands. Our findings might have significant implications in the field of novel optical devices.

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High-precision laser monitoring system with enhanced non-uniform scanning for railway safety

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Railway Engineering Science 2025年第1期33卷 79-93页

作者： Yingying Yang Cheng Wang Xiaoqi Liu Yu Liu Weier Lu Zhonglin Zhu Hongye Yan Guotang Zhao Xuechun Lin Laboratory of All‑Solid‑State Light Sources Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China China State Railway Group Co. Ltd.Beijing 100844China School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China institute of Microelectronics Chinese Academy of SciencesBeijing 100029China Railway Engineering Research institute China Academy of Railway Sciences Corporation LimitedBeijing 100081China

The intrusion of obstacles onto railway tracks presents a significant threat to train safety,characterized by sudden and unpredictable *** China leading the world in high-speed rail mileage,ensuring railway security is *** current laser monitoring technologies suffer from high false alarm rates and unreliable intrusion *** study addresses these issues by investigating high-resolution laser monitoring technology for railway obstacles,focusing on key parameters such as monitoring range and *** propose an enhanced non-uniform laser scanning method,developing a laser monitoring system that reduces the obstacle false alarm rate to 2.00%,significantly lower than the 20%standard(TJ/GW135-2015).This rate is the best record for laser monitoring systems on China *** system operates seamlessly in all weather conditions,providing superior accuracy,resolution,and identification *** is the only 3D LiDAR system certified by the China State Railway Group Co.,Ltd.(Certificate No.[2023]008).Over three years,our system has been deployed at numerous points along various lines managed by the China State Railway Group,accumulating a dataset of 300,000 *** extensive deployment has significantly enhanced railway *** development and implementation of our railway laser monitoring system represent a substantial advancement in railway safety *** low false alarm rate(2.00%),high accuracy(20 cm×20 cm×20 cm),and robust performance in diverse conditions underscore its potential for widespread adoption,promising to enhance railway safety in China and internationally.

关键词： Laser monitoring technology Non-uniform laser scanning method False alarm rate Railway safety

Intensity enhancement of Raman active and forbidden modes induced by naturally occurred hot spot at GaAs edge

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Chinese Physics B 2025年第1期34卷 180-187页

作者： Tao Liu Miao-Ling Lin Da Meng Xin Cong Qiang Kan Jiang-Bin Wu Ping-Heng Tan State Key Laboratory of Semiconductor Physics and Chip Technologies Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Optoelectronic Materials and Devices Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China

Edge structures are ubiquitous in the processing and fabrication of various optoelectronic *** physical properties and enhanced light–matter interactions are anticipated to occur at crystal edges due to the broken spatial translational ***,the intensity of first-order Raman scattering at crystal edges has been rarely explored,although the mechanical stress and edge characteristics have been thoroughly studied by the Raman peak shift and the spectral features of the edge-related Raman ***,by taking Ga As crystal with a well-defined edge as an example,we reveal the intensity enhancement of Raman-active modes and the emergence of Raman-forbidden modes under specific polarization configurations at the *** is attributed to the presence of a hot spot at the edge due to the redistributed electromagnetic fields and electromagnetic wave propagations of incident laser and Raman signal near the edge,which are confirmed by the finite-difference time-domain ***-resolved Raman intensities of both Raman-active and Raman-forbidden modes near the edge are calculated based on the redistributed electromagnetic fields,which quantitatively reproduce the corresponding experimental *** findings offer new insights into the intensity enhancement of Raman scattering at crystal edges and present a new avenue to manipulate light–matter interactions of crystal by manufacturing various types of edges and to characterize the edge structures in photonic and optoelectronic devices.

关键词： polarized Raman spectroscopy edge enhanced Raman scattering spatial translational symmetry breaking electromagnetic field redistribution finite-difference time-domain simulation

Direct ink writing of nickel oxide-based thin films for room temperature gas detection

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Journal of semiconductors 2025年第1期46卷 245-258页

作者： Neha Thakur Hari Murthy Sudha Arumugam Neethu Thomas Aarju Mathew Koshy Parasuraman Swaminathan Department of Electronics and Communication Engineering School of Engineering and TechnologyCHRIST UniversityKumbalagoduBengaluruKarnataka560074India Department of Metallurgical and Materials Engineering Indian Institute of Technology MadrasChennaiTamil Nadu600036India

The rapid industrial growth and increasing population have led to significant pollution and deterioration of the natural atmospheric *** atmospheric pollutants include NO_(2)and CO_(2).Hence,it is imperative to develop NO_(2)and CO_(2)sensors for ambient conditions,that can be used in indoor air quality monitoring,breath analysis,food spoilage detection,*** the present study,two thin film nanocomposite(nickel oxide-graphene and nickel oxide-silver nanowires)gas sensors are fabricated using direct ink *** nano-composites are investigated for their structural,optical,and electrical *** the nano-composite is deposited on the interdigitated electrode(IDE)pattern to form NO_(2)and CO_(2)*** deposited films are then exposed to NO_(2)and CO_(2)gases separately and their response and recovery times are determined using a custom-built gas sensing *** oxide-graphene provides a good response time and recovery time of 10 and 9 s,respectively for NO_(2),due to the higher electron affinity of graphene towards NO_(2).Nickel oxide-silver nanowire nano-composite is suited for CO_(2)gas because silver is an excellent electrocatalyst for CO_(2)by giving response and recovery times of 11 s *** is the first report showcasing NiO nano-composites for NO_(2)and CO_(2)sensing at room temperature.

关键词： nickel oxide graphene silver nanowires NO_(2) CO_(2) gas sensor