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Antiferromagnetic insulating state in quasi-one-dimensional K_(2)Cr_(3)As_(3)H

science China(physics,Mechanics & Astronomy) 2023年第3期66卷 139-146页

作者： Bai-Zhuo Li Si-Qi Wu Jin-Jin Xiang Qin-Qing Zhu Yi Liu Chao Cao Guang-Han Cao School of Physics Zhejiang UniversityHangzhou 310030China School of Science Westlake Institute for Advanced StudyWestlake UniversityHangzhou 310064China Department of Applied Physics Zhejiang University of TechnologyHangzhou 310023China Center for Correlated Matter Zhejiang UniversityHangzhou 310030China Zhejiang Province Key Laboratory of Quantum Technology and Devices Interdisciplinary Center for Quantum InformationState Key Lab of Silicon MaterialsZhejiang UniversityHangzhou 310030China

Quasi-one-dimensional(Q1D) Cr-based pnictide K_(2)Cr_(3)As_(3)exhibits superconductivity probably with spin-triplet pairing. It is of fundamental importance to explore the parent compound from which superconductivity emerges. Here we report the synthesis,crystal structure, physical properties, and density functional theory(DFT) calculations of(nearly) fully hydrogenized K_(2)Cr_(3)As_(3)*** is found that the intercalation of hydrogen in K_(2)Cr_(3)As_(3)leads to absence of metallicity as well as superconductivity. An antiferromagnetic transition nearby room temperature is evidenced from the measurements of magnetic susceptibility and heat *** antiferromagnetic insulating state can be reproduced by the DFT calculations, which show a novel non-collinear co-planar magnetic order. Our result sheds light on the mechanism of unconventional superconductivity in Q1D Cr-based superconductors.

关键词： quasi-one-dimensional Cr-based superconductor antiferromagnetism DFT calculations

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Remarkable average thermoelectric performance of the highly oriented Bi(Te,Se)-based thin films and devices

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Journal of Materiomics 2024年第2期10卷 366-376页

作者： Zhiliang Li Xiaoqi Yang Zhi Gao Jingxuan Wang Yuli Xue Jianglong Wang Qian Cao Zhihai Ding Shufang Wang Hebei Key Lab of Optic-Electronic Information and Materials Key Laboratory of High-Precision Computation and Application of Quantum Field Theory of Hebei ProvinceCollege of Physics Science and TechnologyHebei UniversityBaoding071002China Huabei Cooling Device Co. LtdXianghe065400China

Bi(Te,Se)-based compounds have attracted lots of attention for nearly two centuries as one of the most successful commercial thermoelectric(TE)materials due to their high performance at near room *** with 3D bulks,2D thin films are more compatible with modern semiconductor technology and have unique advantages in the construction of micro-and *** device applications,high average TE performance over the entire operating temperature range is ***,highly c-axis-oriented N-type Bi(Te,Se)epitaxial thin films have been successfully prepared using the pulsed laser deposition technology by adjusting the deposition *** film deposited at~260℃demonstrate a remarkable average power factor(PFave)of~24.4 mW·cm^(-1)·K^(-2)over the tem-perature range of 305e470 K,higher than most of the state-of-the-art Bi(Te,Se)-based ***,the estimated average zT value of the film is as high as~*** then constructed thin-film TE devices by using the above oriented Bi(Te,Se)films,and the maximum output power density of the device can reach up to~30.1 W/m^(2)under the temperature difference of 40 ***,the outstanding average TE performance of the highly oriented Bi(Te,Se)thin films will have an excellent panorama of applications in semiconductor cooling and power generation.

关键词： Bismuth telluride Oriented thin film Thermoelectric device Average power factor Output power density

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Densification , Microstructure, Mechanical and Thermionic Emission Properties of Spark Plasma Sintered lab6-Hfb2 Composite

SSRN

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SSRN 2023年

作者： Yang, Xinyu Zhao, Wei Gu, Zengjie Wang, Ke Luo, Shifeng Zhang, Jiuxing School of Materials Science and Engineering Hefei University of Technology Anhui Hefei230009 China National Key Laboratory of Science and Technology on Vacuum Technology & Physics Lanzhou Institute of Physics Lanzhou730000 China

lab6-HfB2 composites with the different HfB2 contents (10wt.%, 30wt.%, 50wt.%, 70wt.%, 90wt.%) were densified by spark plasma sintering (SPS). The densification mechanism, mechanical and thermionic emission property were investigated. Results showed that the grain boundary diffusion and dislocation climbing mechanism controlled the densification process of lab6-HfB2 composite. Microstructural analysis revealed the evaluation rule of grain size and morphology with the variation of the HfB2 content and SPS process parameters. The dynamic growth of the grain was governed by grain boundary diffusion. Both the Berkovich hardness and Vickers hardness obeyed the normal indentation size effect. lab6-70wt.%HfB2 composite had the highest fracture toughness of 7.36 ±0.43 MPa.m0.5while the highest current density of 18.34 A/cm2 belonged to lab6-30wt.%HfB2 composite. All the results demonstrated lab6-HfB2 composite was a promising material with the excellently structural and functional performance. © 2023, The Authors. All rights reserved.

关键词： Microstructure

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Roll-to-roll fabrication of large-scale polyorgansiloxane thin film with high flexibility and ultra-efficient atomic oxygen resistance

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Plasma science and technology 2022年第6期24卷 173-181页

作者： Yi LI Zhonghua LI Detian LI Yanchun HE Shengzhu CAO Hu WANG Hengjiao GAO Hanjun HU Ying HE Yuan WANG Jun ZHU Science and Technology on Vacuum Technology and Physical Laboratory Lanzhou Institute of PhysicsChina Academy of Space TechnologyLanzhou 730000People's Republic of China School/Hospital of Stomatology School/Hospital of Stomatology Lanzhou University(Dental Hospital).Key Laboratory of Dental Maxillofacial Reconstruction and Biological Intelligence Manufacturing Gansu ProvinceSchool of StomatologyLanzhou UniversityLanzhou 730000People's Republic of China State Key Laboratory of Advanced Display Technology Special Display and Imaging Technology Innovation Center of Anhui ProvinceAnhui Provincial Key Laboratory of Advanced Functional Materials and DevicesAcademy of Opto-Electric TechnologyHefei University of TechnologyHefei 230009People's Republic of China

One of the most widely used and well-established atomic oxygen(AO)protection solutions for low Earth orbit(LEO)satellites is the deposition of protective coatings on polymeric ***,manufacturing extensive expanses of these coating materials with good transparency,flexibility,smoothness,ultra-thinness,and exceptional AO resistance remains a critical ***,we successfully deposited a 400 nm thick polyorgansiloxane(SiO_(x)C_(y)H_(z))coating with high optical transparency and uniform good adherence on to a 1.2 m wide polyimide surface,by optimizing the distribution of hexamethyldisiloxane and oxygen as precursors in the roll-to-roll compatible plasmaenhanced chemical vapor deposition *** AO irradiation with the fluence of 7.9×10^(20)atoms·cm^(–2),the erosion yield of the SiO_(x)C_(y)H_(z)-coated Kapton was less than 2.30×10^(–26)cm^3·atom^(–1),which was less than 0.77%of that of the *** indicates that the SiO_(x)C_(y)H_(z)coating can well prevent the erosion of Kapton by *** addition,it was also clarified that a SiO_(2) passivation layer was formed on the surface of the SiO_(x)C_(y)H_(z)coating during AO irradiation,which exhibited a‘self-reinforcing’defense *** entire preparation process of the SiO_(x)C_(y)H_(z)coating was highly efficient and low-cost,and it has shown great potential for applications in LEO.

关键词： plasma-enhanced chemical vapor deposition hexamethyldisiloxane polyorganosiloxane thin film flexibility atomic oxygen

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Phonon-assisted upconversion in twisted two-dimensional semiconductors

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Light(science & Applications) 2023年第1期12卷 89-98页

作者： Yuchen Dai Pengfei Qi Guangyi Tao Guangjie Yao Beibei Shi Zhixin Liul Zhengchang Liu Xiao He Pu Peng Zhibo Dang Liheng Zheng Tianhao Zhang Yongji Gong Yan Guan Kaihui Liu Zheyu Fang School of Physics State Key Laboratory for Mesoscopic PhysicsAcademy for Advanced Interdisciplinary StudiesCollaborative Innovation Center of Quantum MatterNano-optoelectronics Frontier Center of Ministry of EducationPeking University100871 BeijingChina Institute of Modern Optics Nankai UniversityTianjin Key Laboratory of Micro-scale Optical Information Science and Technology300350 TianjinChina Photonics Research Center School of PhysicsMOE Key Lab of Weak-Light Nonlinear Photonicsand Tianjin Key Lab of Photonics Materials and Technology for Information ScienceNankai University300071 TianjinChina School of Materials Science and Engineering Beihang University100191 BeijingChina Center for Physicochemical Analysis and Measurements in ICCAS Analytical Instrumentation CenterPeking University100871 BeijingChina

Phonon-assisted photon upconversion(UPC)is an anti-Stokes process in which incident photons achieve higher energy emission by absorbing *** letter studies phonon-assisted UPC in twisted 2D semiconductors,in which an inverted contrast between UPC and conventional photoluminescence(PL)of WSe2 twisted bilayer is emergent.A 4-fold UPC enhancement is achieved in 5.5°twisted bilayer while PL weakens by *** interlayer exciton conversion efficiency driven by lattice relaxation,along with enhanced pump efficiency resulting from spectral redshift,lead to the rotation-angle-dependent UPC *** counterintuitive phenomenon provides a novel insight into a unique way that twisted angle affects UPC and light-matter interactions in 2D ***,the UPC enhancement platform with various superimposable means offers an effective method for lighting bilayers and expanding the application prospect of 2D stacked van der Waals devices.

关键词： twisted semiconductors relaxation

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Efficient flexible perovskite solar cells:From materials to buried structure revealed by synchrotron radiation GIWAXS

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Journal of Energy Chemistry 2025年第5期104卷 254-267页

作者： Xiaoxi Li Tingting Wang Lifeng Yang Bitao Dong Yuchun Li Laixi Li Lina Li Shanglei Feng Gengsheng Chen Yingguo Yang School of Microelectronics Fudan UniversityShanghai 200433China Shanghai Synchrotron Radiation Facility(SSRF) Zhangjiang LabShanghai Advanced Research InstituteShanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201204China Department of Physics Shaoxing UniversityShaoxing 312000ZhejiangChina Shanghai Shangchao Technology Co. Ltd.Shanghai 201800China Shanghai Institute of Quality Inspection and Technical Research Shanghai 201114China Department of Materials Sciences and Engering Division of Solid State PhysicsAgstrom LaboratoryUppsala UniversityUppsala SE-75105Sweden State Key Laboratory of Photovoltaic Science and Technology Fudan UniversityShanghai 200433China

Perovskite solar cells(PSC)are considered as a promising photovoltaic technology due to their low cost and high efficiency exceeding 26.8%.Ultra-lightweight flexible perovskite solar cells(FPSCs)can be applied to many fields such as architecture and portable *** the photovoltaic conversion efficiency(PCE)of FPSC has exceeded 24%in the past few years,further application of FPSC is constrained by the challenges posed by limitation of critical material ***,we discussed recent research progress of key FPSC materials,mechanical endurance,low-temperature fabrication,*** the advantages of high brightness,collimation and resolution,we specially introduced the application of synchrotron radiation grazing incidence wide-angle X-ray scattering(GIWAXS)to directly observe the perovskite buried interface structure and corresponding mechanical stability of FPSCs without any ***,we summarize the challenges and propose an outlook about the large-scale preparation of efficient and stable FPSC modules.

关键词： Flexible perovskite solar cells Device materials Buried structure Synchrotron radiation GIWAXS

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Effect of electron beam evaporation process parameters on infrared refractive index of Ge film

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Optoelectronics Letters 2020年第4期16卷 298-302页

作者： LI Kun XIONG Yu-qing WANG Hu ZHANG Kai-feng XU Ling-mao LI Xue-lei ZHOU Hui Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of PhysicsLanzhou 730000China

Ge films were prepared at different deposition temperatures and ion source bias voltage using the electron beam *** infrared refractive index was obtained by spectral *** show that the refractive index becomes larger as the deposition temperature *** maximum refractive index at the wavelength of 4000 nm is 4.274 with the deposition temperatures of 210℃.The refractive index of film decreases first and then increases as the bias voltage *** the ion source bias voltage is 120 V,the refractive index of the film is the *** difference in extinction coefficient of Ge films prepared by different process parameters is small.

关键词： refractive film beam

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Superconductor-semiconductor-superconductor lateral heterojunction diodes based on MSi2N4 (M = Ta,Mo, W) monolayers

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Physical Review Applied 2025年第3期23卷 034082-034082页

作者： Xiaozheng Fan Ruqian Wu Chunlan Ma Shijing Gong Chuanxi Zhao Tianxing Wang Xiao Dong Shaoqian Yin Yipeng An School of Physics Henan Normal University Xinxiang 453007 China Department of Physics and Astronomy University of California Irvine 92697 USA School of Physics and Technology Suzhou University of Science and Technology Suzhou 215009 China Department of Physics East China Normal University Shanghai 200062 China Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials Department of Physics Jinan University Guangzhou 510632 China

Heterojunctions of two-dimensional (2D) materials have generated substantial research interest due to their diverse and novel properties. In this study, we propose a class of superconductor-semiconductor-superconductor (SSS) lateral heterojunction diodes based on MSi2N4 (M = Ta,Mo, W) monolayers. Using the ab initio method, we simulate the time- and angle-resolved photoelectron spectroscopy (Tr-ARPES) for all MSi2N4 monolayers and, importantly, reveal the one-band and two-gap s-wave superconductivities in TaSi2N4. Furthermore, these SSS diodes exhibit a significant and tunable negative differential resistance (NDR) effect. Our findings suggest that MSi2N4 monolayers are promising platforms for studying superconducting materials and NDR-based nanodevices, further broadening the potential applications of the MA2Z4 family of materials in nanoelectronics.

关键词： Heterojunctions

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A touch mode MEMS capacitance diaphragm gauge

A touch mode MEMS capacitance diaphragm gauge

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作者： Li, Gang Han, Xiaodong Sun, Wenjun Cheng, Yongjun Li, Detian Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics Lanzhou China School of Aerospace Engineering Xiamen University Xiamen China

This paper presents a touch mode MEMS capacitance diaphragm gauge (CDG) for differential pressure measurement. The design principle of the gauge is demonstrated, then the diaphragm deflection and capacitance sensitivity are analyzed theoretically. Experimental work was carried out using a principle prototype, which has a square pressure-sensing diaphragm with large width-to-thickness ratio. The test results are consistent with the theoretical model for pressure from 1 Pa to 1000 Pa, and the capacitance-pressure curve of the gauge is near linear in three pressure sections and a maximum sensitivity of 135 fF/Pa is achieved in low pressure range. Moreover, high pressure test results ranging from 1000 Pa to atmospheric pressure indicate that the developed touch mode gauge has wide load range and good overload protection. © 2021

关键词： Capacitance

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A novel Sn-based coordination polymer with high-efficiency and ultrafast lithium storage

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Journal of Materials science & technology 2022年第2期97卷 156-164页

作者： Xinlu Zhang Lu Han Junfeng Li Ting Lu Jinliang Li Guang Zhu Likun Pan Shanghai Key Laboratory of Magnetic Resonance School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China Siyuan Laboratory Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy MaterialsGuangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy MaterialsDepartment of PhysicsJinan UniversityGuangzhouGuangdong 510632China Key Laboratory of SpinElectron and Nanomaterials of Anhui Higher Education Institutes Suzhou UniversitySuzhou 234000China

Recently,Coordination Polymers(CPs)have been widely utilized as energy storage materials for reversible Lithium-Ion Batteries(LIBs)benefiting from their tunable building blocks and adjusted electrochemical ***,the unsatisfied electrochemical behavior of CPs with poor conductivity and sluggish ion transport kinetics is still a bottle-neck for their large-scale energy storage applications in ***,we display the rational fabrication of a conductive Sn-based coordination polymer(Sn-DHTPA)via judiciously choosing suitable building *** Sn-DHTPA is employed as anode for LIBs,exhibiting superior reversible storage capacity of 1142.6 m A h g^(-1) at 0.1 A g^(-1) after 100 cycles and impressive rate storage capability of 287.7 m A h g^(-1)at 20 A g^(-1).More importantly,a robust cycling performance of 205.5 m A h g^(-1) at an extra-high current density of 20 A g^(-1) are observed without remarkable capacity-fading up to1000 *** behavior superiority of Sn-DHTPA is related to its advanced architecture with abundant lithium storage sites,high electrical conductivity and rapid lithium transport.A series of ex-situ characterizations reveal that the impressive lithium storage capacity is contributed by the redox active sites of both the aromatic linker and metal center related to in-situ generated metallic nanoparticles dispersed in the skeleton.

关键词： Sn-based coordination polymer High electrical conductivity Li-ion batteries Anode Lithium storage mechanism

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