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Contact optimisation strategy for wafer-scale field-effect transistors based on two-dimensional semiconductors

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Journal of Materials Science & Technology 2023年第2期133卷 230-237页

作者： Ling Tong Xiaojiao Guo Zhangfeng Shen Lihui Zhou Jingyi Ma Xinyu Chen Honglei Chen Yin Xia chuming sheng Saifei Gou Die Wang Xinyu Wang Xiangqi Dong Yuxuan Zhu Xinzhi Zhang David Wei Zhang sheng Dai Xi Li Peng Zhou Yangang Wang Wenzhong Bao State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghai 200433China College of Biological Chemical Science and EngineeringJiaxing UniversityJiaxing 314001China Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center Institute of Fine ChemicalsSchool of Chemistry&Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai 200433China

Two-dimensional(2D)semiconductors can be utilized to continually miniaturize nanoscale electronic ***,achieving a practical solution for satisfying electrical contact with 2D semiconductors remains *** this study,we developed a novel contact structure with transferred multilayer(t-ML)MoS 2 by integrating both edge and top *** in-situ plasma treatment for the edge of the MoS 2 channel and successive metal deposition,we achieved 16 times lower contact resistivity(22.8 kΩμm)than that of the top contacted *** thickness-dependent electrical measurement indicates that edge contact is highly effective with thick MoS 2 due to the alleviated current-crowding effect re-sulting from the small contact *** temperature-dependent transport measurement further confirms the effective minimization of the influence from the Schottky barrier and tunnelling ***,the simplified resistor network model and energy-band diagram were proposed to understand the carrier transport *** work provides a practical strategy for achieving excellent electrical contact between bulk metals and 2D semiconductors,paving the way for future large-scale 2D electronic devices.

关键词： Edge contact 2D materials Field-effect transistors Schottky barrier Contact resistance

Stacking monolayers at will:A scalable device optimization strategy for two-dimensional semiconductors

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Nano Research 2022年第7期15卷 6620-6627页

作者： Xiaojiao Guo Honglei Chen Jihong Bian Fuyou Liao Jingyi Ma Simeng Zhang Xinzhi Zhang Junqiang Zhu Chen Luo Zijian Zhang Lingyi Zong Yin Xia chuming sheng Zihan Xu Saifei Gou Xinyu Wang Peng Gong Liwei Liu Xixi Jiang Zhenghua An Chunxiao Cong Zhijun Qiu Xing Wu Peng Zhou Xinyu Chen Ling Tong Wenzhong Bao State Key Laboratory of ASIC and System School of MicroelectronicsZhangjiang Fudan International Innovation CenterFudan UniversityShanghai 200433China The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518057China Department of Physics State Key Laboratory of Surface PhysicsInstitute of Nanoelectronic Devices and Quantum Computing and Key Laboratory of MicroFudan UniversityShanghai 200433China State Key Laboratory of ASIC and System School of Information Science and EngineeringFudan UniversityShanghai 200433China Shanghai Key Laboratory of Multidimensional Information Processing Department of Electronic Engineering East China Normal UniversityShanghai 200241China Shenzhen Six Carbon Technology Shenzhen 518055China Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan UniversityShanghai 200433China

In comparison to monolayer(1L),multilayer(ML)two-dimensional(2D)semiconducting transition metal dichalcogenides(TMDs)exhibit more application potential for electronic and optoelectronic devices due to their improved current carrying capability,higher mobility,and broader spectral ***,the investigation of devices based on wafer-scale ML-TMDs is still restricted by the synthesis of uniform and high-quality ML *** this work,we propose a strategy of stacking MoS_(2) monolayers via a vacuum transfer method,by which one could obtain wafer-scale high-quality MoS_(2) films with the desired number of layers at *** optical characteristics of these stacked ML-MoS_(2) films(>2L)indicate a weak interlayer *** stacked MLMoS_(2) phototransistors show improved optoelectrical performances and a broader spectral response(approximately 300-1,000 nm)than that of 1L-MoS_(2).Additionally,the dual-gate ML-MoS_(2) transistors enable enhanced electrostatic control over the stacked ML-MoS_(2) channel,and the 3L and 4L thicknesses exhibit the optimal device performances according to the turning point of the current on/off ratio and the subthreshold swing.

关键词： two-dimensional semiconductor field-effect transistors chemical vapor deposition(CVD)synthesis interlayer coupling vacuum transfer method dual-gate transistor

预置轻骨料混凝土与普通轻骨料混凝土的性能对比

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混凝土 2024年第9期 35-39页

作者：彭波李文董贤政盛楚鸣刘云鹏武汉理工大学硅酸盐建筑材料国家重点实验室湖北武汉430070 武汉理工大学材料科学与工程国际化示范学院湖北武汉430070 中建三局第三建设工程有限责任公司湖北武汉430070

研究了相近强度等级(LC40)下预置轻骨料混凝土与普通轻骨料混凝土的物理性能与耐久性能。结果表明:相同强度等级下,预置轻骨料混凝土密度较普通轻骨料混凝土降低约200 kg/m^(3);同时具有更好的匀质性(上下质量差仅为0.14%,普通轻骨料混... 详细信息

研究了相近强度等级(LC40)下预置轻骨料混凝土与普通轻骨料混凝土的物理性能与耐久性能。结果表明:相同强度等级下,预置轻骨料混凝土密度较普通轻骨料混凝土降低约200 kg/m^(3);同时具有更好的匀质性(上下质量差仅为0.14%,普通轻骨料混凝土为1.68%)与体积稳定性(干缩为普通轻骨料混凝土的1/3)。但由于轻骨料自身强度与弹性模量低,相同强度等级预置轻骨料混凝土的脆性增大,抗折强度与弹性模量降低;并且大量轻骨料堆积提供水分与离子传输通道,抗氯离子扩散性能以及抗冻性能也会降低。

关键词：轻骨料混凝土预置骨料混凝土力学性能耐久性

Effect of heat treatment on the microstructure and mechanical properties of a multidirectionally forged Mg-Gd-Y-Zn-Zr-Ag alloy

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Journal of Magnesium and Alloys 2023年第6期11卷 2042-2053页

作者： Junkai Wang chuming Liu Shunong Jiang Yingchun Wan Zhiyong Chen School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory for Powder Metallurgy Central South UniversityChangsha 410083China School of Materials Science and Engineering Hunan University of Science and TechnologyXiangtan 411201China

Multidirectional forging(MDF)was successfully applied to fabricate large-size Mg-Gd-Y-Zn-Zr-Ag alloy in this work and effects of T4,T5 and T6 treatments on the microstructure and mechanical properties of the as-forged alloy were *** show that dynamic recrystallization(DRX)occurs and second phase particles precipitate along the grain boundary during the MDF *** annealing treatment(T4),the volume fraction and size of dynamic precipitates slightly increase at a lower temperature(430℃)compared with those of MDFed sample,while they are dissolved into theα-Mg matrix at a higher temperature(450℃).At the meantime,short plate-shaped long-period stacking ordered(LPSO)phases are observed in the DRX grains of the MDFed sample and then dissolved into theα-Mg matrix during annealing at both *** basal texture is identified in the MDFed sample,but the basal pole tilts away from final forging direction and rare-earth texture component withorientation parallel to penultimate forging direction becomes visible after *** T6 sample annealing at 430℃for 4 h and ageing at 200℃for 34 h exhibits the superior strength and ductility in this *** ultimate tensile strength,tensile yield strength and elongation to failure,which is 455 MPa,308 MPa and 7.7%,respectively,are overall improved compared with the directly-aged(T5)*** paper provides a superior heat treatment schedule to manufacture high-performance large-scale Mg-Gd-Y-Zn-Zr-Ag components for industrial production.

关键词： Mg-Gd-Y-Zn-Zr-Ag alloy Multidirectional forging Dynamic precipitation Heat treatment Mechanical properties

Deformation mechanism,orientation evolution and mechanical properties of annealed cross-rolled Mg-Zn-Zr-Y-Gd sheet during tension

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Journal of Magnesium and Alloys 2023年第7期11卷 2340-2350页

作者： Xia Lin Zhiyong Chen Jianbo Shao Jiangying Xiong Zhang Hu chuming Liu School of Materials Science and Engineering Central South UniversityChangsha 410083China

Mg-6.75Zn-0.57Zr-0.4Y-0.18Gd(wt.%)sheet with typical basal texture was produced by cross rolling and *** temperature tensile tests were subsequently conducted along rolling direction(RD),transverse direction(TD),and diagonal direction(RD45).Deformation mechanism and orientation evolution during the tension were investigated by quasi-in-situ electron backscatter diffraction observation and in-grain misorientation axis *** results indicate that the activation of deformation mechanism mainly depends on the initial grain *** RD sample,prismaticslip plays an important role in the deformation of grains withaxis nearly perpendicular to the *** theaxis gradually tilted towards the RD,basalslip becomes the dominant deformation *** the tensile fracture,the initial concentrically distributed{0001}pole is split into double peaks extending perpendicular to the RD,and the randomly distributed{1010}pole becomes parallel to the *** evolution in{0001}and{1010}poles during tension is related to the lattice rotation induced by basalslip and prismaticslip,*** and RD45 samples exhibit similar deformation mechanism and orientation evolution as the RD sample,which results in the nearly isotropic mechanical properties in the annealed cross-rolled sheet.

关键词： Magnesium alloys Deformation mechanism Orientation evolution Mechanical properties

Formation of nanocrystalline AZ31B Mg alloys via cryogenic rotary swaging

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Journal of Magnesium and Alloys 2023年第5期11卷 1580-1591页

作者： Xin Chen chuming Liu Yingchun Wan Shunong Jiang Xiuzhu Han Zhiyong Chen Light Alloy Research Institute Central South UniversityChangsha 410083China School of Materials Science and Engineering Central South UniversityChangsha 410083China School of Metallurgy and Environment Central South UniversityChangsha 410083China Beijing Institute of Spacecraft System Engineering Beijing 100094China

A bulk nanocrystalline AZ31B Mg alloy with extraordinarily high strength was prepared via cryogenic rotary swaging in this *** obtained alloy shows finer grains,higher strength,and a negligible tension-compression yield asymmetry,compared with that prepared via room-temperature rotary *** electron microscopy investigations showed that at the initial stage,multiple twins,mostly tension twins,were activated and intersected with each other,thereby refining the coarse grains into a fine lamellar ***,two types of nanoscale subgrains were generated with increasing swaging *** first type of nanoscale subgrain contained twin boundaries and low-angle grain *** type of subgrain appeared at the twin-twin intersections and was mainly driven by high local *** second type of nanoscale subgrain was formed within the twin *** boundaries of this type of subgrain did not contain twin boundaries and were transformed from massive dislocation ***,randomly oriented nanograins were obtained via dynamic recrystallization,under the combined function of deformation heat and increased stored *** with room-temperature rotary swaging,cryogenic rotary swaging exhibits a slower grain refinement process but a remarkably enhanced grain refinement effect after the same five-pass swaging.

关键词： Cryogenic rotary swaging Nanocrystalline Mg alloy Grain refinement Twinning Dislocation arrays

Analysis of energy consumption characteristics of hydraulic system for wrecker truck based on CPR

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High Technology Letters 2018年第1期24卷 82-89页

作者：晁智强 Ning chuming Shen Wei Li Huaying Han Shousong Department of Mechanical Engineering Academy of Armored Force Engineering Beijing 100072 P. R. China School of Mechanical Engineering University of Shanghai for Science and Technology Shanghai 200093 P.R. China

In order to solve problems associated with high heat production,high-energy consumption and low efficiency for the hydraulic system of the working device in a wrecker truck,a hydraulic energysaving system based on common pressure rail( CPR) is proposed. A hydraulic transformer is utilized to control the actuators by analyzing energy-consumption characteristics of valve controlled hydraulic system in a wrecker truck. By analyzing the energy-saving principle of a hydraulic energy-saving system,a relevant mathematical model is established. A comparison is performed between the energysaving hydraulic system and valve controlled hydraulic system in a wrecker truck within the same work period for operating efficiency and energy consumption. Results show that hydraulic energysaving system of the wrecker truck has better controlling performance and efficiency of about 18%higher than the valve controlled hydraulic system. Energy-saving ratio for total energy consumption in this system reaches 51. 46%,demonstrating energy-saving effect of the system.

关键词： common pressure rail (CPR) hydraulic transformer energy saving wreckertruck

The effect of LPSO on the deformation mechanism of Mg-Gd-Y-Zn-Zr magnesium alloy

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Journal of Magnesium and Alloys 2016年第2期4卷 83-88页

作者： Jianbo Shao Zhiyong Chen Tao Chen Zhang Hu Xiaojie Zhou chuming Liu School of Materials Science and Engineering Central South UniversityChangsha 410083China

The tensile deformation behavior and corresponding microstructure evolution of the Mg-4.7Gd-3.4Y-1.2Zn-0.5Zr(at.%)magnesium alloy with long period stacking structure(LPSO)are studied by electron backscatter diffraction(EBSD)and slip lines *** results show that less and very small size of twins is observed in the grains with high value of Schmid factor for twinning,which indicates that the growth of the{10–12}twinning deformation is prevented by the LPSO *** prismatic lines present in grains of which the prismatic slip Schmid factor is above *** favorable orientation and LPSO phase synergistically promote the activation of prismatic *** inhomogeneous rotation of the grains during deformation is the reason for the microcrack at grain boundary.

关键词： Rare earth magnesium alloys LPSO Deformation mechanism Crystal orientation

Electrochemical Activation-Induced Structural Transformation in Ni(OH)_(2)/Ti_(3)C_(2)T_(x)/NF Systems with Enhanced Electrochemical Performance for Hybrid Supercapacitors

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Energy & Environmental Materials 2024年第4期7卷 277-284页

作者： chuming Xu Lu Dai Yiming Zhao Shuang Li Yapan Wu Xueqian Wu Gaixia Zhang Shuhui Sun Dongsheng Li College of Materials and Chemical Engineering Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion MaterialsChina Three Gorges UniversityYichang 443002China Hubei Three Gorges Laboratory Yichang 443007China Department of Electrical Engineering École de Technologie Supérieure(ÉTS)MontréalQuébec H3C 1K3Canada Institut National de la Recherche Scientifique(INRS) CentreÉnergie Matériaux TélécommunicationsVarennesQuébec J3X 1P7Canada

Exploring a novel strategy for large-scale production of battery-type Ni(OH)_(2)-based composites,with excellent capacitive performance,is still greatly ***,we developed a facile and cost-effective strategy to in situ grow a layer of Ni(OH)_(2)/Ti_(3)C_(2)T_(x)composite on the nickel foam(NF)collector,where Ti_(3)C_(2)T_(x)is not only a conductive component,but also a catalyst that accelerates the oxidation of NF to Ni(OH)_(2).Detailed analysis reveals that the crystallinity,morphology,and electronic structure of the integrated electrode can be tuned via the electrochemical activation,which is beneficial for improving electrical conductivity and redox *** expected,the integrated electrode shows a specific capacity of 1.09 C cm^(-2)at 1 mA cm^(-2)after three custom activation cycles and maintains 92.4%of the initial capacity after 1500 ***,a hybrid supercapacitor composed of Ni(OH)_(2)/Ti_(3)C_(2)T_(x)/NF cathode and activated carbon anode provides an energy density of 0.1 mWh cm^(-2)at a power density of 0.97 mW cm^(-2),and excellent cycling stability with about 110%capacity retention rate after 5000 *** work would afford an economical and convenient method to steer commercial Ni foam into advanced Ni(OH)_(2)-based composite materials as binder-free electrodes for hybrid supercapacitors.

关键词： electrochemical activation hybrid supercapacitors Ni(OH)_(2) Ti_(3)C_(2)T_(x)