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Electro-statically controllable graphene local heater

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Chinese Physics B 2018年第3期27卷 405-409页

作者：王慧山邓联文李蕾孙秋娟谢红王浩敏 State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences CAS center for excellence in superconducting electronics Chinese Academy of Sciences School of Electronic Electrical and Communication Engineering University of Chinese Academy of Sciences School of Physics and electronics Central South University

We report on current-induced thermal power investigation of graphene nanostructure for potential local-heating ap- plications. It is found that the efficiency of heating can be greatly improved if graphene is patterned into structures with narrow width and long channel. In a narrow graphene-ribbon, the Joule heating power exhibits an obvious dependence on the back-gate voltage. By monitoring Raman spectra, the temperature of graphene-ribbon can be determined. The temperature of graphene-ribbon is modulated by the electric field effect when the sample is sourced with a relatively high current.

关键词： graphene electric field effect Raman

Supercontinuum single-photon detector using multilayer superconducting nanowires

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Photonics Research 2019年第12期7卷 1425-1431页

作者： HAO LI YONG WANG LIXING YOU HEQING WANG HUI ZHOU PENG HU WEIJUN ZHANG XIAOYU LIU XIAOYAN YANG LU ZHANG ZHEN WANG XIAOMING XIE State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences(CAS)Shanghai 200050China CAS center for excellence in superconducting electronics Shanghai 200050China center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

High-efficiency superconducting nanowire single-photon detectors(SNSPDs), which have numerous applications in quantum information systems, function by using the optical cavity and the ultrasensitive photon response of their ultra-thin superconducting nanowires. However, the wideband response of superconducting nanowires is limited due to the resonance of the traditional optical cavity. Here, we report on a supercontinuum SNSPD that can efficiently detect single photons over an ultra-broad spectral range from visible to mid-infrared light. Our detection approach relies on using multiple cavities with well-separated absorbed resonances formed by fabricating multilayer superconducting nanowires on metallic mirrors with silica acting as spacer layers. Thus, we are able to extend the absorption spectral bandwidth while maintaining considerable efficiency, as opposed to a conventional single-layer SNSPD. Our calculations show that the proposed supercontinuum SNSPD exhibits an extended absorption bandwidth with increased nanowire layers. Its absorption efficiency is greater than 70%over the entire range from 400 to 2500 nm(or 400 to 3000 nm), when using two-layer(or three-layer) *** a proof of principle, the SNSPD with bilayer nanowires is fabricated based on the proposed detector architecture with simplified geometrical parameters. The detector achieves broadband detection efficiency over 60%from 950 to 1650 nm. This type of detector may replace multiple narrow band detectors in a system and find uses in the emerging and rapidly advancing field of atomic and molecular broadband spectroscopy.

关键词： nanowires superconducting absorption

superconducting microstrip single-photon detector with system detection efficiency over 90%at 1550 nm

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Photonics Research 2021年第6期9卷 958-967页

作者： GUANG-ZHAO XU WEI-JUN ZHANG LI-XING YOU JIA-MIN XIONG XING-QU SUN HAO HUANG XIN OU YI-MING PAN CHAO-LIN LV HAO LI ZHEN WANG XIAO-MING XIE State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences(CAS)Shanghai 200050China center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China CAS center for excellence in superconducting electronics Shanghai 200050China

Generally,a superconducting nanowire single-photon detector(SNSPD)is composed of wires with a typical width of∼100 *** studies have found that superconducting strips with a micrometer-scale width can also detect single *** with the SNSPD covering the same area,the superconducting microstrip single-photon detector(SMSPD)has smaller kinetic inductance,higher working current,and lower requirements in fabrication accuracy,providing potential applications in the development of ultralarge active area ***,the study of SMSPD is still in its infancy,and the realization of its high-performance and practical use remains an open *** study demonstrates a NbN SMSPD with a nearly saturated system detection efficiency(SDE)of∼92.2%at a dark count rate of∼200 cps,a polarization sensitivity of∼1.03,and a minimum timing jitter of∼48 ps at the telecom wavelength of 1550 nm when coupled with a single-mode fiber and operated at 0.84 ***,the detector’s SDE is over 70%when operated at a 2.1 K closed-cycle cryocooler.

关键词： polarization photon system

Electronic Instability of Kagome Metal CsV_(3)Sb_(5) in the 2×2×2 Charge Density Wave State

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Chinese Physics Letters 2023年第4期40卷 56-61页

作者：朱红恩李彤瑞喻芳航李昱良王盛吴云波刘站锋尚政明崔胜涛刘毅张国斌张李东王震宇吴涛应剑俊陈仙辉孙喆 National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Department of Physics CAS Key Laboratory of Strongly-coupled Quantum Matter PhysicsUniversity of Science and Technology of ChinaHefei 230026China CAS center for excellence in Quantum Information and Quantum Physics Hefei 230026China Collaborative Innovation center of Advanced Microstructures Nanjing 210093China CAS center for excellence in superconducting electronics(CENSE) Shanghai 200050China

Recently discovered kagome metals AV_(3)Sb_(5)(A=K,Rb,and Cs)provide an ideal platform to study the correlation among nontrivial band topology,unconventional charge density wave(CDW),and *** evolution of electronic structures associated with the change of lattice modulations is crucial for understanding of the CDW mechanism,with the combination of angle-resolved photoemission spectroscopy(ARPES)measurements and density functional theory calculations,we investigate how band dispersions change with the increase of lattice *** particular,we focus on the electronic states around M point,where the van Hove singularities are expected to play crucial roles in the CDW *** ARPES studies reported a spectral weight splitting of the van Hove singularity around M point,which is associated with the 3D lattice *** studies reveal that this“splitting”can be connected to the two van Hove singularities at k_(z)=0 and k_(z)=π/c in the normal *** the electronic system enters into the CDW state,both van Hove singularities move *** novel properties are important for understanding of the CDW transition.

关键词： transition splitting lattice

Anisotropic 2D materials for post-Moore photoelectric devices

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Journal of Semiconductors 2022年第1期43卷 1-3页

作者： Dingdong Xie Jie Jiang Liming Ding Hunan Key Laboratory of Super Microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China center for excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

Since the discovery of two-dimensional(2D)graphene[1],2D materials have been widely investigated due to their in-triguing physical/chemical property and outstanding optoelec-tronic performance[1−3].Generally,2D materials can be di-vided into isotropy and anisotropy according to crystal *** isotropic 2D materials like graphene and hexagon-al boron nitride,they have obvious lattice ***-as,anisotropic 2D materials possess strong anisotropic crys-tal structure(Fig.1(a)),providing new degree of freedom for exploring 2D ***,2D materials with high aniso-tropy,due to their anisotropic electrical,optical,thermal,and phonon properties,are finding applications in polarization-sensitive photodetection,neural network construction,spin-polarized transport and other emerging fields[3−6].

关键词： anisotropic struc boron

The issues on the commercialization of perovskite solar cells

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Materials Futures

Materials Futures 2024年第2期3卷 1-35页

作者： Lixiu Zhang Yousheng Wang Xiangchuan Meng Jia Zhang Pengfei Wu Min Wang Fengren Cao Chunhao Chen Zhaokui Wang Fu Yang Xiaodong Li Yu Zou Xi Jin Yan Jiang Hengyue Li Yucheng Liu Tongle Bu Buyi Yan Yaowen Li Junfeng Fang Lixin Xiao Junliang Yang Fuzhi Huang Shengzhong Liu Jizhong Yao Liangsheng Liao Liang Li Fei Zhang Yiqiang Zhan Yiwang Chen Yaohua Mai Liming Ding center for excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190People’s Republic of China Institute of New Energy Technology College of Information Science and TechnologyJinan UniversityGuangzhou 510632People’s Republic of China Institute of Polymers and Energy Chemistry(IPEC) Nanchang UniversityNanchang 330031People’s Republic of China School of Information Science and Technology Fudan UniversityShanghai 200433People’s Republic of China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072People’s Republic of China School of Physical Science and Technology Soochow UniversitySuzhou 215006People’s Republic of China Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123People’s Republic of China Institute of optoelectronics Fudan UniversityShanghai 200433People’s Republic of China College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123People’s Republic of China School of Physics and Electronic Science East China Normal UniversityShanghai 200241People’s Republic of China State Key Laboratory for Artificial Microstructure and Mesoscopic Physics Department of PhysicsPeking UniversityBeijing 100871People’s Republic of China College of Biophotonics South China Normal UniversityGuangzhou 510631People’s Republic of China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China School of Physics and electronics Central South UniversityChangsha 410083People’s Republic of China School of Materials Science and Engineering Shaanxi Normal UniversityXi’an 710119People’s Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China Microquanta semiconductor Hangzhou 311121People’s Republic of China

Perovskite solar cells have aroused a worldwide research upsurge in recent years due to their soaring photovoltaic performance,ease of solution processing,and low *** power conversion efficiency record is constantly being broken and has recently reached 26.1%in the lab,which is comparable to the established photovoltaic technologies such as crystalline silicon,copper indium gallium selenide and cadmium telluride(CdTe)solar ***,perovskite solar cells are standing at the entrance of industrialization,where huge opportunities and risks ***,towards commercialization,challenges of up-scaling,stability and lead toxicity still remain,the proper handling of which could potentially lead to the widespread adoption of perovskite solar cells as a low-cost and efficient source of renewable *** review gives a holistic analysis of the path towards commercialization for perovskite solar cells.A comprehensive overview of the current state-of-the-art level for perovskite solar cells and modules will be introduced first,with respect to the module efficiency,stability and current status of *** will then discuss the challenges that get in the way of commercialization and the corresponding strategies to address them,involving the upscaling,the stability and the lead toxicity *** into the future direction of commercialization of perovskite photovoltaics was also provided,including the flexible perovskite cells and modules and perovskite indoor ***,the future perspectives towards commercialization are put forward.

关键词： commercializations perovskite solar cells state-of-the-art level challenges and perspectives indoor photovoltaics

Screen-Printable Functional Nanomaterials for Flexible and Wearable Single-Enzyme-Based Energy-Harvesting and Self-Powered Biosensing Devices

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Nano-Micro Letters 2023年第6期15卷 254-269页

作者： Kornautchaya Veenuttranon Kanyawee Kaewpradub Itthipon Jeerapan center of excellence for Trace Analysis and Biosensor Prince of Songkla UniversityHat YaiSongkhla 90110Thailand Division of Physical Science Faculty of SciencePrince of Songkla UniversityHat YaiSongkhla 90110Thailand center of excellence for Innovation in Chemistry Faculty of SciencePrince of Songkla UniversityHat YaiSongkhla 90110Thailand

Developing flexible bioelectronics is essential to the realization of artificial intelligence devices and biomedical applications, such as wearables, but their potential is limited by sustainable energy supply. An enzymatic biofuel cell(BFC) is promising for power supply, but its use is limited by the challenges of incorporating multiple enzymes and rigid platforms. This paper shows the first example of screen-printable nanocomposite inks engineered for a single-enzyme-based energy-harvesting device and a self-powered biosensor driven by glucose on bioanode and biocathode. The anode ink is modified with naphthoquinone and multiwalled carbon nanotubes(MWCNTs), whereas the cathode ink is modified with Prussian blue/MWCNT hybrid before immobilizing with glucose oxidase. The flexible bioanode and the biocathode consume glucose. This BFC yields an open circuit voltage of 0.45 V and a maximum power density of 266 μW cm-2. The wearable device coupled with a wireless portable system can convert chemical energy into electric energy and detect glucose in artificial sweat. The self-powered sensor can detect glucose concentrations up to 10 mM. Common interfering substances,including lactate, uric acid, ascorbic acid, and creatinine, have no effect on this self-powered biosensor. Additionally, the device can endure multiple mechanical deformations. New advances in ink development and flexible platforms enable a wide range of applications, including on-body electronics, self-sustainable applications, and smart fabrics.

关键词： Screen-printable nanocomposites Glucose Glucose oxidase Biofuel cells Self-powered biosensors Flexible bioelectronics

32×32 NbN SNSPD array based on thermally coupled row-column multiplexing architecture

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Superconductivity 2023年第3期7卷 46-52页

作者： TianZhu Zhang You Xiao HuiQin Yu Jia Huang ChaoLin Lv LingDong Kong XiaoYu Liu Hao Li LiXing You Zhen Wang National Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences(CAS)865 Changning Rd.Shanghai 200050China center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China CAS center for excellence in superconducting electronics 865 Changning Rd.Shanghai 200050China Photon Technology(Zhejiang)Co. Ltd.Jiaxing 314100ZhejiangChina

We report a superconducting nanowire single‐photon detector(SNSPD)array aiming for a near‐infrared 1550‐nm wavelength that consists of 32×32 nanowire pixels and an area of 0.96 mm×0.96 *** most reported large‐scale SNSPD arrays with amorphous films,NbN superconducting nanowires are employed in our array,which allows the detector operation at 2.3 K provided by a compact two‐stage Gifford–McMahon *** coupled row–column multiplexing is employed in our arrays to avoid current redistribution and loss of electrical signal occurring in the electrically coupled row–column *** fabricated detector array shows a pixel yield of 94%and maximal intrinsic efficiencies of 77%and 96%at 1550 nm and 405 nm,*** timing jitter and the thermal coupling probability are also investigated.

关键词： superconducting nanowire single‐photon detector Array Thermally coupled row-column

Geometric origin of intrinsic dark counts in superconducting nanowire single-photon detectors

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Superconductivity 2022年第1期1卷 45-51页

作者： Xingyu Zhang Xiaofu Zhang Jia Huang Can Yang Lixing You Xiaoyu Liu Peng Hu You Xiao Wenying Zhang Yongliang Wang Lingyun Li Zhen Wang Hao Li State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology(SIMIT)Chinese Academy of Sciences(CAS)865 Changning Rd.Shanghai 200050People’s Republic of China center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049People’s Republic of China CAS center for excellence in superconducting electronics 865 Changning Rd.Shanghai 200050People’s Republic of China

The dark count is one of the key physical issues for superconducting nanowire single-photon detectors(SNSPDs)that limits various applications for optical quantum information and classical *** the bias current approaches the switching current of SNSPDs,the dark count is actually dominated by the intrinsic dark counts(iDCs).However,the origin of iDCs and its relation to constrictions remains unclear for practical *** herein systematically characterize the iDCs of the SNSPDs with and without artificial geometric constrictions by applying the differential readout *** these devices with constrictions,we have observed distinct Gaussian distributions in the temporal distribution of iDCs,in which the time difference between the distributions is consistent with the geometric distance between constrictions,and the rates of iDCs produced by each constriction are in good agreement with constrictions'*** respect to practical SNSPDs,surprisingly,we also observe several Gaussian distributions in the temporal domain and it shows no significant dependence on the devices’sizes,demonstrating that the iDCs of SNSPDs are mainly dominated by a few specific constrictions.

关键词： superconducting nanowire Single-photon detector Dark count Differential readout