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Achieving high carrier mobility and low lattice thermal conductivity in GeTe-based alloys by cationic/anionic co-doping

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Rare Metals 2024年第6期43卷 2784-2795页

作者： Xiao-Qiang Wang Xiao-Quan Hu Jun-Yan Lin Chu-Bin Li Xiao-Tong Yu Qi-Yong Chen Li-Li Xi Qi-Shuo Yang Han Li Ji-Ye Zhang Shuan-Kui Li Kai Guo School of Physics and Materials Science Guangzhou UniversityGuangzhou 510006China Research Center for Advanced Information Materials(CAIM) Huangpu Research&Graduate School of Guangzhou UniversitySino-Singapore Guangzhou Knowledge CityGuangzhou510555China School of Materials Science and Engineering Shanghai UniversityShanghai 200444China Materials Genome Institute Shanghai UniversityShanghai 200444China School of Mechanical and Mining Engineering University of QueenslandBrisbaneQLD 4072Australia Key Laboratory of Si-Based Information Materials&Devices and Integrated Circuits Design Department of Education of Guangdong ProvinceGuangzhou 510006China

TheⅣ-Ⅵcompound GeTe is considered as a promising alternative to the toxic PbTe for high-efficiency mid-temperature thermoelectric ***,pristine GeTe suffers from a high concentration of Ge vacancies,resulting in an excessively high hole concentration(>1×10^(21)cm^(-3)),which greatly limits its thermoelectric *** address this issue,CuBiTe_(2)alloying is introduced to increase the formation energy of Ge vacancies in GeTe,thereby inhibiting the high carrier *** carrier scattering caused by the electronegativity difference between different elements is suppressed due to the similar electronegativity of Cu and Ge atoms.A relatively high hole mobility is obtained,which ultimately leads to a high power ***,by introducing Se as an alloying element at the anionic site in GeTe,dense point defects with mass/strainfield fluctuations are *** contributes to the strengthening of phonon scattering,thereby reducing the lattice thermal conductivity from 1.44 W·m^(-1)·K^(-1)for pristine GeTe to 0.28 W·m^(-1)·K^(-1)for Ge_(0.95)Cu_(0.05)Bi_(0.05)Te_(0.9)Se_(0.15)compound at 623 K.

关键词： GeTe Carrier mobility CuBiTe_(2)alloying Lattice thermal conductivity Thermoelectric properties

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Metal-to-insulator transition in oxide semimetals by anion doping

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Interdisciplinary materials 2024年第3期3卷 358-368页

作者： Haitao Hong Huimin Zhang Shan Lin Jeffrey A.Dhas Binod Paudel Shuai Xu Shengru Chen Ting Cui Yiyan Fan Dongke Rong Qiao Jin Zihua Zhu Yingge Du Scott A.Chambers Chen Ge Can Wang Qinghua Zhang Le Wang Kui-juan Jin Shuai Dong Er-Jia Guo Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijingChina Department of Physics&Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Key Laboratory of Quantum Materials and Devices of Ministry of Education School of PhysicsSoutheast UniversityNanjingChina Materials Science and Technology Division Oak Ridge National LaboratoryOak RidgeTennesseeUSA Physical and Computational Sciences Directorate Pacific Northwest National LaboratoryRichlandWashingtonUSA School of Chemical Biological and Environmental EngineeringOregon State UniversityCorvallisOregonUSA Beijing Advanced Innovation Center for Materials Genome Engineering Department of Physical ChemistryUniversity of Science and Technology BeijingBeijingChina Environmental Molecular Sciences Laboratory Pacific Northwest National LaboratoryRichlandWashingtonUSA Songshan Lake Materials Laboratory DongguanGuangdongChina

Oxide semimetals exhibiting both nontrivial topological characteristics stand as exemplary parent compounds and multiple degrees of freedom,offering a promise for the realization of novel electronic *** this work,we report the structural and transport phase transition in an oxide semimetal,SrNbO_(3),achieved through effective anion ***,the resistivity increased by more than three orders of magnitude at room temperature upon *** extent of electronic modulation in SrNbO_(3)is strongly correlated with misfit strain,underscoring its phase instability to both chemical doping and crystallographic symmetry *** first-principles calculations,we discern that elevating the level of nitrogen doping induces an upward shift in the conductive bands of SrNbO_(3−δ)N_(δ).Consequently,a transition from a metallic state to an insulating state becomes apparent as the nitrogen concentration reaches a threshold of 1/*** investigation shows effective anion engineering in oxide semimetals,offering pathways for manipulating their physical properties.

关键词： anion doping metal-to-insulator transition oxide semimetal phase transition

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Composing atomic transition metal sites for high-performance bifunctional oxygen electrocatalysis in rechargeable zinc-air batteries

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Particuology 2023年第6期77卷 146-152页

作者： Juan Wang Chang-Xin Zhao Jia-Ning Liu Ding Ren Xinzhi Ma Bo-Quan Li Jia-Qi Huang Qiang Zhan School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing100081China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing100084China Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin150025China

Rechargeable zinc-air batteries have attracted extensive attention as clean,safe,and high-efficient en-ergy storage ***,the oxygen redox reactions at cathode are highly sluggish in kinetics and severely limit the actual battery *** transition metal sites demonstrate high electro-catalytic activity towards respective oxygen reduction and evolution,while high bifunctional electro-catalytic activity is seldomly *** a strategy of composing atomic transition metal sites is proposed to fabricate high active bifunctional oxygen electrocatalysts and high-performance recharge-able zinc-air ***,atomic Fe and Ni sites are composed based on their respective high electrocatalytic activity on oxygen reduction and *** composite electrocatalyst demonstrates high bifunctional electrocatalytic activity(ΔE=0.72 V)and exceeds noble-metal-based Pt/C+Ir/C(ΔE=0.79 V).Accordingly,rechargeable zinc-air batteries with the composite electrocatalyst realize over 100 stable cycles at 25 mA *** work affords an effective strategy to fabricate bifunctional oxygen electrocatalysts for high-performance rechargeable zinc-air batteries.

关键词： Rechargeable zinc-air batteries Bifunctional oxygen electrocatalysis Noble-metal-free electrocatalysts Oxygen reduction reaction Oxygen evolution reaction

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Simulation study of multi-layer titanium nitride nanodisk broadband solar absorber and thermal emitter

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Communications in Theoretical physics 2024年第11期76卷 151-160页

作者： Xi Huang Yingting Yi Qianju Song Zao Yi Can Ma Chaojun Tang Qingdong Zeng Shubo Cheng Rizwan Raza School of Mathematics and Science Joint Laboratory for Extreme Conditions Matter PropertiesThe State Key Laboratory of Environment-friendly Energy MaterialsTianfu Institute of Research and InnovationSouthwest University of Science and TechnologyMianyang 621010China College of Physics Central South UniversityChangsha 410083China Department of Oncology Sichuan Science City HospitalMianyangSichuan Province 621000China School of Chemistry and Chemical Engineering Jishou UniversityJishou 416000China College of Science Zhejiang University of TechnologyHangzhou 310023China School of Physics and Electronic-information Engineering Hubei Engineering UniversityXiaogan 432000China School of Physics and Optoelectronic Engineering Yangtze UniversityJingzhouHubei 434023China Department of Physics COMSATS Institute of Information Technology 54000 LahorePakistan

Solar energy has always been a kind of energy with large reserves and wide *** is well utilized through solar *** our study,the finite difference time domain method(FDTD)is used to simulate the absorber composed of refractory metal materials,and its absorption performance and thermal emission performance are *** ultra-wide band of 200 nm-3000 nm reaches 95.93%absorption efficiency,of which the bandwidth absorption efficiency of2533 nm(200 nm-2733 nm)is greater than 90%.The absorption efficiency in the whole spectrum range(200 nm-2733 nm)is 97.17%on *** multilayer nanodisk structure of the absorber allows it to undergo strong surface plasmon resonance and near-field coupling when irradiated by incident *** thermal emission performance of the absorber enables it to also be applied to the thermal *** thermal emission efficiency of 95.37%can be achieved at a high temperature of up to 1500 ***,the changes of polarization and incident angle do not cause significant changes in *** the gradual change of polarization angle(0°-90°),the absorption spectrum maintains a high degree of *** the incident angle increases from 0°to 60°,there is still 85%absorption *** high absorption efficiency and excellent thermal radiation intensity of ultra-wideband enable it to be deeply used in energy absorption and conversion applications.

关键词： surface plasmon resonance multi-layer nanodisk structure ultra-wideband efficient absorption rate high thermal radiation intensity

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Thermal-modulation spin-orbit torque for 180° Néel vector switching

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Physical Review materials 2024年第7期8卷 074406-074406页

作者： J. K. Dai L. Han W. Q. He Y. X. Zhu H. Bai W. X. Zhu S. X. Liang Y. C. Zhang Y. Z. Cao J. W. Liu F. Pan C. Song Key Laboratory of Advanced Materials School of Materials Science and Engineering Beijing National Laboratory for Condensed Matter Physics Department of Physics

The electrical 180° switching of the antiferromagnetic Néel vector is a long-term goal for building high-performance spintronic devices, such as the antiferromagnetic random-access memory that requires a single writing channel. For practical application, unavoidable thermal effects during the 180° Néel vector switching process should be taken into account, which still need a profound understanding. Here, we present an unconventional thermal-modulation spin-orbit torque (SOT) mechanism for the 180° Néel vector switching in the spin-splitting antiferromagnet Mn5Si3, in which the electrical SOT switching is highly modulated by Joule heating. Guided by this mechanism, we observed two distinct switching dynamical behaviors during the switching process, depending on whether heating effects raise the temperature above the Néel temperature of Mn5Si3 within the duration of electrical pulses. This unconventional switching mechanism is far beyond the scope of traditional SOT switching. Moreover, the thermal-modulation SOT mechanism showcases notably higher switching efficiency compared to the ferromagnetic and ferrimagnetic counterparts. Our findings not only deepen the understanding of the mechanism for electrical 180° switching of the Néel vector but also of spintronic devices based on spin-splitting antiferromagnets with low power consumption.

关键词： Magnetotransport Spin dynamics Spintronics

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The influence of post-aging treatment on the microstructure and micromechanical behaviors of additively manufactured maraging steel investigated by in situ high-energy X-ray diffraction

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Journal of materials science & Technology 2024年第33期200卷 1-12页

作者： Yang Li Jingyue Yu Shilei Li Shengjie Wang Yang Ren Ke Yang Yan-Dong Wang Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China Department of Physics City University of Hong KongHong Kong 999077China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China Institute for Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China

The microstructure evolution and micromechanical behaviors of additively manufactured 18Ni_(3)00 marag-ing steel for both as-printed and aged one were investigated using the in situ high-energy X-ray diffrac-tion(HE-XRD)technique with uniaxial tensile *** investigations revealed that the volume frac-tion of reversed austenite increased as the annealing temperature *** maraging steel was strength-ened byη-Ni_(3)Ti precipitates,where the aged maraging steel had a higher UTS value of∼1860 MPa than∼1135 MPa in the as-printed one,but sacrificed more than half of ductility(from∼8.6%to∼4.0%).The austenite in aged steel presents more stability induced by the aging process than that in as-printed counterpart,which has a higher critical martensitic transformation stress of∼1200 MPa than that of∼780 MPa in as-printed *** austenite grains orientated with[200]//LD yield before the macro-yielding and preferential martensite transformation *** study provides further insight into the intricated micromechanical responses of additively manufactured 18Ni_(3)00 maraging steel,enlarging the scope of its adaptation and application.

关键词： Additive manufacturing Maraging steel Aging treatment High-energy X-ray diffraction

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Optical study of the charge dynamics evolution in the topological insulators MnBi2Te4 and Mn(Bi0.74Sb0.26)2Te4 under high pressure

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Physical Review B 2024年第24期109卷 245124-245124页

作者： M. Köpf S. H. Lee Z. Q. Mao C. A. Kuntscher Experimentalphysik II Institute of Physics 2D Crystal Consortium Materials Research Institute Department of Physics Department of Materials Science and Engineering

The van der Waals material MnBi2Te4 and the related Sb-substituted compounds Mn(Bi1−xSbx)2Te4 are prominent members of the family of magnetic topological insulators, in which rare quantum mechanical states can be realized. In this work, we study the evolution of the charge dynamics in MnBi2Te4 and the Sb-substituted compound Mn(Bi1−xSbx)2Te4 with x=0.26 under hydrostatic pressure. For MnBi2Te4, the pressure dependence of the screened plasma frequency, the dc conductivity, and the reflectance at selected frequencies show weak anomalies at ∼2 and ∼4 GPa, which might be related to an electronic phase transition driven by the enhanced interlayer interaction. We observe a pressure-induced decrease in the optical gap, consistent with the decrease in and closing of the energy gap reported in the literature. Both studied materials show an unusual decrease in the low-energy optical conductivity under pressure, which we attribute to the decreasing spectral weight of the Drude terms describing the free charge carrier excitations. Our results suggest a localization of conduction electrons under pressure, possibly due to hybridization effects.

关键词： Phase transitions Topological insulators Fourier transform infrared spectroscopy

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Concentrated ternary ether electrolyte allows for stable cycling of a lithium metal battery with commercial mass loading high-nickel NMC and thin anodes

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Carbon Energy 2023年第3期5卷 2-18页

作者： Jun Yang Xing Li Ke Qu Yixian Wang Kangqi Shen Changhuan Jiang Bo Yu Pan Luo Zhuangzhi Li Mingyang Chen Bingshu Guo Mingshan Wang Junchen Chen Zhiyuan Ma Yun Huang Zhenzhong Yang Pengcheng Liu Rong Huang Xiaodi Ren David Mitlin School of New Energy and Materials Southwest Petroleum UniversityChengduChina Energy Storage Research Institute Southwest Petroleum UniversityChengduChina Shenzhen Key Laboratory of Nanobiomechanics Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhenChina China Key Laboratory of Polar Materials and Devices(MOE) Department of ElectronicsEast China Normal UniversityShanghaiChina Materials Science Program and Texas Materials Institute The University of Texas at AustinAustinTexasUSA Beijing Computational Science Research Center BeijingChina School of Materials Science and Engineering Center for Green Innovation University of Science and Technology BeijingBeijingChina Department of Materials Science and Engineering Hefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefeiAnhuiChina

A new concentrated ternary salt ether-based electrolyte enables stable cycling of lithium metal battery(LMB)cells with high-mass-loading(13.8 mg cm^(−2),2.5 mAh cm^(−2))NMC622(LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2))cathodes and 50μm Li ***“CETHER-3,”this electrolyte is based on LiTFSI,LiDFOB,and LiBF4 with 5 vol%fluorinated ethylene carbonate in 1,***-cial carbonate and state-of-the-art binary salt ether electrolytes were also tested as *** CETHER-3,the electrochemical performance of the full-cell battery is among the most favorably reported in terms of high-voltage cycling *** example,LiNi_(x)Mn_(y)Co_(1-x-y)O_(2)(NMC)-Li metal cells retain 80%capacity at 430 cycles with a 4.4 V cut-off and 83%capacity at 100 cycles with a 4.5 V cut-off(charge at C/5,discharge at C/2).According to simulation by density functional theory and molecular dynamics,this favorable performance is an outcome of enhanced coordination between Li^(+)and the solvent/salt *** advanced microscopy(high-resolution transmission electron microscopy,scanning electron microscopy)and surface science(X-ray photoelectron spectroscopy,time-of-fight secondary ion mass spectroscopy,Fourier-transform infrared spectroscopy,Raman spectroscopy),it is demonstrated that a thinner and more stable cathode electrolyte interphase(CEI)and solid electrolyte interphase(SEI)are *** CEI is rich in lithium sulfide(Li_(2)SO_(3)),while the SEI is rich in Li_(3)N and *** cycling,the CEI/SEI suppresses both the deleterious transformation of the cathode R-3m layered near-surface structure into disordered rock salt and the growth of lithium metal dendrites.

关键词： concentrated electrolyte density functional theory ether electrolyte high‐nickel cathode high‐voltage battery molecular dynamics

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Super retina TFT based full color microLED display via laser mass transfer

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science China(Information sciences) 2024年第11期67卷 5-19页

作者： Xu YANG Jinchai LI Xuhui PENG Chunfeng ZHAO Chao CHEN Xiaowei ZHANG Jinliang LIN Donghua LI Yuefen CHEN Zhaoxia BI Feng QIN Cheng LI Kai HUANG Junyong KANG Rong ZHANG Fujian Key Laboratory of Semiconductor Materials and Applications CI Center for OSEDEngineering Research Center of Micro-nano Optoelectronic Materials and Devices Ministry of EducationDepartment of Physics Xiamen University Future Display Institute of Xiamen Tianma Microelectronics Co. Ltd. School of Electronic Science and Engineering Xiamen University Tianma Advanced Display Technology Institute (Xiamen) Co. Ltd.

MicroLED display is considered one of the most promising technologies for next-generation displays. However, the high manufacturing cost has been a major obstacle to its accessibility to the general consumer market, and mass transfer, an essential process to achieve cost-effective manufacturing, has not yet reached commercial maturity. Critical issues, such as microLED chips, transfer equipments, and process materials, need to be addressed for the mass transfer technologies. In this work, we present a 1.63-inch full color microLED display module fabricated with laser mass transfer, which has a pixel density of 403 pixels per inch(PPI), the highest resolution ever achieved in the industry using mass transfer technologies. The laser mass transfer is realized with three process nodes: laser lift-off, laser induced forward transfer, and carrier bonding. Each node has been well explored to improve yields. Insights into the present progress and the future development of the laser mass transfer will be shared in this work.

关键词： microLED mass transfer LLO chip on wafer chip on carrier

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Surface density of states and tunneling spectroscopy of a spin-32 superconductor with Bogoliubov Fermi surfaces

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Physical Review B 2024年第10期110卷 104515页

作者： Ryoi Ohashi Shingo Kobayashi Shotaro Kanazawa Yukio Tanaka Yuki Kawaguchi Department of Materials Engineering Science Wako Saitama 351-0198 Japan Department of Applied Physics Research Center for Crystalline Materials Engineering

Bogoliubov Fermi surfaces (BFSs) of superconducting states arise from point or line nodes by breaking time-reversal symmetry. Because line and point nodes often accompany topologically protected zero-energy surface Andreev bound states (SABSs) and thereby lead to a characteristic zero-bias conductance peak (ZBCP) in tunneling spectroscopy, we investigate how these properties change when the line and point nodes deform into BFSs. In this paper, we consider spin-quintet Jpair=2 pairing states of spin-32 electrons with BFSs and calculate the surface density of states and the charge conductance. Comparing the obtained results with the cases of spin-singlet d-wave pairing states having the same symmetry, we find that the ZBCP associated with point and/or line nodes is blunted or split in accordance with the appearance of the BFSs. On the other hand, when the spin-singlet d-wave state has point nodes but does not have SABS on the surface, we obtain a nonzero small electron conductivity at zero bias through the zero-energy states on the BFSs.

关键词： Andreev bound states Topological superconductors Superconductors Bogoliubov-de Gennes equations Green's function methods

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