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Facile integration of an Al-rich Al_(1-x)In_(x)N photodetector on free-standing GaN by radio-frequency magnetron sputtering

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Chinese Physics B 2023年第11期32卷 591-597页

作者：刘新科林之晨林钰恒陈建金邹苹周杰李博沈龙海朱德亮刘强俞文杰黎晓华顾泓王新中黄双武 College of Materials Science and Engineering Institute of Microelectronics(IME)Guangdong Research Center for Interfacial Engineering of Functional MaterialsShenzhen UniversityShenzhen 518060China School of Science Shenyang Ligong UniversityShenyang 110159China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Gusu Laboratory of Materials Science Suzhou 215123China Information Technology Research Institute Shenzhen Institute of Information TechnologyShenzhen 518172China

Al_(1-x)In_(x)N, a Ⅲ-nitride semiconductor material, is currently of great research interest due to its remarkable physical properties and chemical stability. When the Al and In compositions are tuned, its band-gap energy varies from 0.7 eV to 6.2 eV, which shows great potential for application in photodetectors. Here, we report the fabrication and performance evaluation of integrated Al_(1-x)In_(x)N on a free-standing GaN substrate through direct radio-frequency magnetron *** optical properties of Al_(1-x)In_(x)N will be enhanced by the polarization effect of a heterostructure composed of Al_(1-x)In_(x)N and other Ⅲ-nitride materials. An Al_(1-x)In_(x)N/Ga N visible-light photodetector was prepared by semiconductor fabrication technologies such as lithography and metal deposition. The highest photoresponsivity achieved was 1.52 A·W^(-1)under 365 nm wavelength illumination and the photodetector was determined to have the composition Al0.75In0.25N/GaN.A rise time of 0.55 s was observed after transient analysis of the device. The prepared Al_(1-x)In_(x)N visible-light photodetector had a low dark current, high photoresponsivity and fast response speed. By promoting a low-cost, simple fabrication method,this study expands the application of ternary alloy Al_(1-x)In_(x)N visible-light photodetectors in optical communication.

关键词： Ali-xIn N photodetector GaN radio-frequency magnetron sputtering ternary alloy

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Investigation of the room-temperature photoelectron spectroscopy of type-Ⅱ Weyl semimetal candidate WTe_(2)

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Tungsten 2023年第3期5卷 350-356页

作者： Jian-Yang Ding Zheng-Tai Liu Zhe Huang Zhi-Cheng Jiang Yi-Chen Yang Zhong-Hao Liu Ji-Shan Liu Yan-Feng Guo Da-Wei Shen State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

Layered transition metal dichalcogenides have novel physical properties and great potential for *** them,WTe2,which has an extremely large unsaturated magnetoresistance and is theoretically predicted to be a type-Ⅱ Weyl semimetal,has been extensively ***,we systematically probe the electronic structure of WTe_(2) at room temperature using high-resolution angle-resolved photoelectron spectroscopy(ARPES).We find that temperature-driven chemical potential shift and Lifshitz transition,which is equivalent to low-energy band structures shift downward by around 50 meV,compared to the results at low *** ARPES experimental results match well with previous theoretical calculations,implying the possible existence of type-Ⅱ Weyl points near the Γ-X ***,as expected,there exists a dominantly electron-like Fermi surface instead of the one with compensated electrons and ***,our ARPES results show that the flat band(FB) lying below the Fermi level(EF) becomes closer to the Fermi level at room temperature,which might start to dominate the transport behavior and lead to the disappearance of the unsaturated giant magnetoresistance *** findings not only reveal the electronic structure features of WTe_(2) at room temperature,but also provide new insights into the development of room-temperature topological quantum devices.

关键词： Weyl semimetal Electronic structure ARPES Compensation effect

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Ta-Doped Sb2Te Allows Ultrafast Phase-Change Memory with Excellent High-Temperature Operation Characteristics

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Nano-Micro Letters 2021年第2期13卷 221-231页

作者： Yuan Xue Shuai Yan Shilong Lv Sannian Song Zhitang Song State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050People’s Republic of China

Phase-change memory(PCM)has considerable promise for new applications based on von Neumann and emerging neuromorphic computing ***,a key challenge in harnessing the advantages of PCM devices is achieving high-speed operation of these devices at elevated temperatures,which is critical for the efficient processing and reliable storage of data at full ***,we report a novel PCM device based on Ta-doped antimony telluride(Sb2Te),which exhibits both high-speed characteristics and excellent high-temperature characteristics,with an operation speed of 2 ns,endurance of >106 cycles,and reversible switching at 140℃.The high coordination number of Ta and the strong bonds between Ta and Sb/Te atoms contribute to the robustness of the amorphous structure,which improves the thermal ***,the small grains in the three-dimensional limit lead to an increased energy efficiency and a reduced risk of layer segregation,reducing the power consumption and improving the long-term *** findings for this new Ta-Sb2Te material system can facilitate the development of PCMs with improved performance and novel applications.

关键词： Phase-change memory High speed Ta High-temperature operation

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Anisotropy of Electronic Spin Texture in the High-Temperature Cuprate Superconductor Bi_(2)Sr_(2)CaCu_(2)O_(8+δ)

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Chinese Physics Letters 2023年第3期40卷 45-48页

作者：刘文晶查鹤鸣顾根大沈晓萍叶茂乔山 State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Condensed Matter Physics and Materials Science Department Brookhaven National LaboratoryUptonNew York11973USA State Key Laboratory of Surface Physics Department of PhysicsFudan UniversityShanghai 200433China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

Seeking new order parameters and the related broken symmetry and studying their relationship with phase transition have been important topics in condensed matter ***,by using spin-and angle-resolved photoemission spectroscopy,we confirm the helical spin texture caused by spin-layer locking in the nodal region in the cuprate superconductor Bi_(2)Sr_(2)CaCu_(2)O_(8+δ)and discover the anisotropy of spin polarizations at nodes alongΓ–X andΓ–Y *** breaking of C_(4)rotational symmetry in electronic spin texture may give deeper insights into understanding the ground state of cuprate superconductors.

关键词： symmetry superconductor breaking

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Cobalt-Free BaFe_(0.6)Zr_(0.1)Y_(0.3)O_(3−δ)Oxygen Electrode for Reversible Protonic Ceramic Electrochemical Cells

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Transactions of Tianjin University 2023年第6期29卷 444-452页

作者： Chenghao Yang Jin Li Ao Hu Jian Pu Bo Chi State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials MOE Key Laboratory for the Green Preparation and Application of Functional MaterialsFaculty of Materials Science and EngineeringHubei UniversityWuhan 430062China MOE Key Laboratory of Material Chemistry for Energy Conversion and Storage Huazhong University of Science and TechnologyWuhan 430074China

Reversible protonic ceramic electrochemical cells(R-PCECs)are ideal,high-effi ciency devices that are environmentally friendly and have a modular *** paper studies BaFe_(0.6)Zr_(0.1)Y_(0.3)O_(3−δ)(BFZY3)as a cobalt-free perovskite oxygen electrode for high-performance R-PCECs where Y ions doping can increase the concentration of oxygen vacancies with a remarkable increase in catalytic *** cell with confi guration of Ni-BZCYYb/BZCYYb/BFZY3 demonstrated promising performance in dual modes of fuel cells(FCs)and electrolysis cells(ECs)at 650℃with low polarization resistance of 0.13Ωcm^(2),peak power density of 546.59 mW/cm^(2)in FC mode,and current density of−1.03 A/cm^(2)at 1.3 V in EC *** alternative operation between FC and EC modes for up to eight cycles with a total of 80 h suggests that the cell with BFZY3 is exceptionally stable and reversible over the long *** results indicated that BFZY3 has considerable potential as an air electrode material for R-PCECs,permitting effi cient oxygen reduction and water splitting.

关键词： Protonic ceramic cells Oxygen electrode Perovskite oxides Cobalt-free Oxygen vacancies

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Revealing the dynamics of the alloying and segregation of Pt-Co nanoparticles via in-situ environmental transmission electron microscopy

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Nano Research 2023年第2期16卷 3055-3062页

作者： Xing Li Shaobo Cheng Yanghua He Lixiang Qian Dmitri Zakharov Gang Wu Chongxin Shan Liang Zhang Dong Su Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Material PhysicsSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China Center for Functional Nanomaterials Brookhaven National LaboratoryUptonNY 11973USA Department of Chemical and Biological Engineering University at BuffaloThe State University of New YorkBuffaloNY 14260USA Center for Combustion Energy School of Vehicle and MobilityTsinghua UniversityBeijing 100084China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Thermal treatment is a general and efficient way to synthesize intermetallic catalysts and may involve complicated physical *** far,the mechanisms leading to the size and composition heterogeneity,as well as the phase segregation behavior in Pt-Co nanoparticles(NPs)are still not well *** in-situ environmental transmission electron microscopy,the formation dynamics and segregation behaviors of Pt-Co alloyed NPs during the thermal treatment were *** is found that Pt-Co NPs on zeolitic imidazolate frameworks-67-derived nanocarbon(NC)are formed consecutively through both particle migration coalescence and the Ostwald ripening *** existence of Pt NPs is found to affect the movement of Co NPs during their *** the help of theoretical calculations,the correlations between the composition and migration of the Pt and Co during the ripening process were *** complex alloying processes are revealed as key factors leading to the heterogeneity of the synthesized Pt-Co alloyed *** oxidation environment,the Pt-Co NPs become surface faceted gradually,which can be attributed to the oxygen facilitated relatively higher segregation rate of Co from the(111)*** work advances the fundamental understanding of design,synthesis,and durability of the Pt-based nanocatalysts.

关键词： intermetallic catalyst alloying ripening segregation dynamics environmental transmission electron microscopy(ETEM)

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Novel P2-type layered medium-entropy ceramics oxide as cathode material for sodium-ion batteries

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Journal of Advanced Ceramics 2022年第1期11卷 158-171页

作者： Shengxue YAN Shaohua LUO Liu YANG Jian FENG Pengwei LI Qing WANG Yahui ZHANG Xin LIU School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province School of Resources and MaterialsNortheastern University at QinhuangdaoQinhuangdao 066004China School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

High-entropy oxides(HEOs)and medium-entropy oxides(MEOs)are new types of single-phase solid solution *** have rarely been reported as positive electrode material for sodium-ion batteries(SIBs).In this study,we first proposed the concept of the application of MEOs in SIBs.P2-type 3-cation oxide Na_(2/3)Ni_(1/3)Mn_(1/3)Fe_(1/3)O_(2)(NaNMF)and 4-cation oxide Na_(2/3)Ni_(1/3)Mn_(1/3)Fe_(1/3-x)Al_(x)O_(2)(NaNMFA)were prepared using the solid-state method,rather than the doping *** addition,the importance of the concept of entropy stabilization in material performance and battery cycling was demonstrated by testing 3-cation(NaNMF)and 4-cation(NaNMFA)oxides in the same ***,NaNMFA can provide a reversible capacity of about 125.6 mAh-g”1 in the voltage range of 2-4.2 V,and has enhanced cycle *** capacity and decay law of the MEO batteries indicate that the configurational entropy(1.28 R(NaNMFA)>1.10 R(NaNMF))of the cationic system,is the main factor affecting the structural and cycle stability of the electrode *** work emphasizes that the rational design of MEOs with novel structures and different electrochemically active elements may be the strategy for exploring high-performance SIB cathode materials in next-generation energy storage devices.

关键词： cathode materials medium-entropy oxide(MEO) configuration entropy electrochemical performance sodium-ion batteries(SIBs)

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Ultra-Broadband, Compact, Low-loss 3-dB Power Splitter Using Adiabatic Subwavelength Grating in Silicon-on-insulator 3

Ultra-Broadband, Compact, Low-loss 3-dB Power Splitter Using...

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3rd International Conference on Laser, Optics, and Optoelectronic Technology, LOPET 2023

作者： Liu, Xiang Zhao, Yingxuan State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China University of Chinese Academy of Sciences Beijing100049 China

ISBN: (纸本)9781510667624

We propose an ultra-broadband, compact size and low loss 3-dB adiabatic subwavelength grating-based power splitter based on the silicon-on-insulator platform. Simulation results show that our proposed device has an operating bandwidth of 250 nm, covering the wavelength range from 1400 to 1650 nm, while the device size is reduced to 11 μm and the excess loss is as low as 0.22 dB. Compatible with mature CMOS process, our proposed subwavelength grating-based power splitter shows excellent potential for large-scale photonic integrated circuits. © 2023 SPIE.

关键词： Silicon photonics

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PlantCFG:A comprehensive database with web tools for analyzing candidate flowering genes in multiple plants

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Plant Communications 2024年第2期5卷 11-14页

作者： Dongxu Liu Jiawei Li Shengbo Wang Tingting Huang Fangting Tao Yuchen Lin Wei Lin Xinle Zhao Yiming Huang Yupeng Jia Zhiquan Yang Chengfang Luo Qiang Zhu Wing-Kin Sung Jian Wu Qing-Yong Yang National Key Laboratory of Crop Genetic Improvement Hubei Hongshan LaboratoryHuazhong Agricultural UniversityWuhan 430070China Hubei Key Laboratory of Agricultural Bioinformatics College of InformaticsHuazhong Agricultural UniversityWuhan 430070China Hong Kong Genome Institute Hong Kong Science ParkShatinHong KongChina State Key Laboratory of Biocontrol School of Life SciencesSun Yat-Sen UniversityGuangzhou 510275China School of Life Sciences University of Science and Technology of ChinaHefei 230026China Key Laboratory of Plant Functional Genomics of the Ministry of Education Yangzhou UniversityYangzhou 225009China

Dear Editor,The transition from the vegetative to the reproductive phase of plant development,known as the floral transition,plays important roles in the plant life *** is a vulnerable but crucial phase for building crop yield,and proper timing of this period is therefore vital for obtaining optimal yields(Jung and Muller,2009).Analysis of flowering time is currently an important research topic in several fields,including plant molecular genetics,evolutionary biology,ecology,and crop breeding(Huang et al.,2011).

关键词： database web breeding

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Manipulating the ionic nanophase of Nafion by in-situ precise hybridization with polymer quantum dot towards highly enhanced fuel cell performances

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Nano Research 2022年第5期15卷 4124-4131页

作者： Wenjia Wu Zhuofan Zhou Yan Wang Yatao Zhang Yong Wang Jingtao Wang Yecheng Zou School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China Henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou 450003China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China State Key Laboratory of Fluorinated Functional Membrane Materials Shandong DongYue Polymer Material Co.Ltd.Zibo 256400China

Hierarchical-structure materials hold great promise for numerous applied domains such as fuel cell,sensor,and ***,the developments are significantly impeded by the lack of efficient strategy permitting precise and efficient decoration of specific confined ***,an in-situ precise hybridization strategy is proposed to efficiently manipulate the nanostructure of membrane ***,Nafion ionic nanochannels are impregnated with precursors via heat swelling,followed by microwave-assisted condensation to form polymer quantum dot *** formation of polymer quantum dot network significantly improves the stability and functionality of ionic nanophase(i.e.,ionic nanochannel).This helps hybrid membrane achieving enhanced proton conduction and methanol barrier properties,resulting in over ten times increase in proton/methanol *** then impart prominent device performances for both hydrogen and methanol fuel cells with the elevation of~100%.Importantly,such function manipulation of ionic nanochannels is achieved with fully maintaining function of backbone ***,the regulation of physical topology and chemical environment of ionic nanochannel also brings optimization of gas and ion separation *** facile and versatile strategy may open up a new avenue for decorating confined space of many hierarchical-structure materials.

关键词： nanophase-separated membrane in-situ precise hybridization polymer quantum dot nanophase decoration performance enhancement

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