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Wafer‑Scale Ag_(2)S‑Based Memristive Crossbar Arrays with Ultra‑Low Switching‑Energies Reaching Biological Synapses

Nano-Micro Letters 2025年第3期17卷 328-339页

作者： Yuan Zhu Tomas Nyberg Leif Nyholm Daniel Primetzhofer xun shi Zhen Zhang Division of Solid‑State Electronics Department of Electrical EngineeringUppsala University75121 UppsalaSweden Department of Chemistry Uppsala UniversityUppsalaSweden Department of Physics and Astronomy Uppsala UniversityUppsalaSweden State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050People’s Republic of China

Memristive crossbar arrays(MCAs)offer parallel data storage and processing for energy-efficient neuromorphic ***,most wafer-scale MCAs that are compatible with complementary metal-oxide-semiconductor(CMOS)technology still suffer from substantially larger energy consumption than biological synapses,due to the slow kinetics of forming conductive paths inside the memristive *** we report wafer-scale Ag_(2)S-based MCAs realized using CMOS-compatible processes at temperatures below 160℃.Ag_(2)S electrolytes supply highly mobile Ag+ions,and provide the Ag/Ag_(2)S interface with low silver nucleation barrier to form silver filaments at low energy *** further enhancing Ag+migration in Ag_(2)S electrolytes via microstructure modulation,the integrated memristors exhibit a record low threshold of approximately−0.1 V,and demonstrate ultra-low switching-energies reaching femtojoule values as observed in biological *** low-temperature process also enables MCA integration on polyimide substrates for applications in flexible ***,the intrinsic nonidealities of the memristive units for deep learning can be compensated by employing an advanced training *** impressive accuracy of 92.6%in image recognition simulations is demonstrated with the MCAs after the *** demonstrated MCAs provide a promising device option for neuromorphic computing with ultra-high energy-efficiency.

关键词： Wafer-scale Ag_(2)S films Reactive sputter Silver nucleation Ag^(+)migration Energy-efficient neuromorphic computing

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Enhanced service stability and thermoelectric performance in Cu_(2)−δSebased composites

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Science China Materials 2024年第7期67卷 2369-2370页

作者： Pengfei Qiu xun shi State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China

Thermoelectric(TE)materials can directly convert the industrial waste heat into useful electricity based on the Seebeck effect,providing a promising way to tackle the environmental pollution and global energy crisis[1].In the past several decades,many new high-performance TE materials have been discovered to enrich the TE *** them,Cu_(2)−δSe-based TE materials,which are in line with the“phonon-liquid electron-crystal”concept,have sparked widespread interest due to the high TE figure-of-merit(ZT)and the combination of elements that are nontoxic and earth-abundant[2].In 2012,Liu et al.[3]reported a ZT of 1.5 at 1000 K in the stoichiometric Cu_(2)*** alloying S at the Se-site,the ZT was enhanced to around 2.0 at 1000 K[4].Via incorporating carbon nanotubes,the ZT was further enhanced to 2.4 at 1000 K[5].Moreover,Yang et al.[6]and Zhou et al.[7]reported that the ZT of Cu_(2)Se/BiCuSeO composites can reach 2.7–2.8 around 1000 K.

关键词： composites BiCuSeO performance

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Effects of bismuth on growth of intermetallic compounds in Sn-Ag-Cu Pb-free solder joints

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中国有色金属学会会刊：英文版 2006年第B2期16卷 739-743页

作者： LI Guo-yuan shi xun-qing School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Intel Technology Development Ltd Shanghai 200131 China

The effects of Bi addition on the growth of intermetallic compound (IMC) formation in Sn-3.8Ag-0.7Cu solder joints were investigated. The test samples were prepared by conventional surface mounting technology. To investigate the element diffusion and the growth kinetics of intermetallics formation in solder joint, isothermal aging test was performed at temperatures of 100, 150, and 190℃, respectively. The optical microscope (OM) and scanning electron microscope (SEM) were used to observe microstructure evolution of solder joint and to estimate the thickness and the grain size of the intermetallic layers. The IMC phases were identified by energy dispersive X-ray (EDX) and X-ray diffractometer (XRD). The results clearly show that adding about 1.0% Bi in Sn-Ag-Cu solder alloy system can refine the grain size of the IMC and inhibit the excessive IMC growth in solder joints, and therefore improve the reliability of the Pb-free solder joints. Through observation of the microstructural evolution of the solder joints, the mechanism of inhibition of IMC growth due to Bi addition was proposed.

关键词： Sn-Ag-Cu合金无铅焊料铋焊接接头金属间化合物

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Quantifying the impact of mountain precipitation on runoff in Hotan River, northwestern China

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Frontiers of Earth Science 2020年第3期14卷 568-577页

作者： Baofu Li Jili Zheng xun shi Yaning Chen School of Geography and Tourism Qufu Normal UniversityRizhao276826China Rizhao Key Laboratory of Territory Spatial Planning and Ecological Construction Rizhao276826China Department of Geography Dartmouth CollegeHanoverNH03755USA State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi830011China

It is of great significance to quantitatively assess the impact of mountain precipitation on inland river runoff in data scarce *** on the corrected TRMM precipitation and runoff data,a variety of statistical methods were used to identify which areas of precipitation have an important impact on runoff in the Hotan River Basin,and to evaluate the effects that precipitation changes have on runoff at low,mid,high,and extremely high altitudes of mountainous *** results showed that:1)From 1998 to 2015,the annual runoff showed a fluctuating upward trend with a rate of 11.21×10^8 m^3/10 a(P<0.05).Runoff in every season also had an increasing trend,with summer runoff the most significant at a rate of 6.09×10^8 m^3/10 a.2)The annual runoff and precipitation changes had certain synchronization,with a correlation coefficient of 0.45(P<0.05).Among them,the correlations between precipitation and runoff changes were highest at low and mid-altitudes,with coefficients of 0.62 and 0.55,respectively(P<0.05).3)65.95%of the regional precipitation at low altitudes and 48.34%at high altitudes were significantly correlated with runoff(P<0.05),while only 38.84%and 26.58%of regional precipitation levels at mid-and extremely high altitudes were significantly correlated with runoff.4)The annual precipitation change in the basin was 1%,which would cause the annual runoff to change by 0.24%.In 1998-2015,the change of annual runoff caused by precipitation change at high altitudes was largest at a rate of−6.01%;the change rates of annual runoff caused by precipitation change in the low,mid-,and extremely high altitudes were−3.66%,−3.62%,and−3.67%,*** results have significant scientific guidance for water resource management in arid basins.

关键词： precipitation mountainous areas runoff TRMM arid region of northwestern China

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Entanglement Evolution of Two-Coupled Spins in a Time-Dependent Rotating Magnetic Field

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Communications in Theoretical Physics 2008年第10期50卷 883-888页

作者： ZHANG shi-xun ZHU Qin-Sheng KUANG Xiao-Yu Institute of Atomic and Molecular Physics Sichuan University Chengdu 610065 China International Center for Materials Physics Chinese Academy of Sciences Shenyang 110016 China

We study the dynamics evolution of a two-qubit Heisenberg XXX spin chain under a time-dependent rotating magnetic field. Based on the algebraic structure of the non-autonomous system, the exact solution of the Schrodinger equation is obtained by using the method of algebraic dynamics. Based on the time-dependent analytical solution, we further study the entanglement evolution between the two coupled spins for different initial states, and find that the entanglement is determined by the coefficients of the initial state and the coupling constant J of the system.

关键词： entanglement evolution algebraic dynamics non-autonomous system

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Improved positioning algorithm based on two step least square in NLOS environments

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The Journal of China Universities of Posts and Telecommunications 2011年第5期18卷 58-63页

作者： WU shi-xun LI Ji-ping-yin LIU Shou Department of Electronics and Communication Engineering Central China Normal University Wuhan 430079 China

Non-line-of-sight （NLOS） propagation is a major source of error for accurate time-of-arrival （TOA） location estimation. The two-step least square （LS） method, which does not need any information about the distribution of the NLOS error, has been studied in related researches to provide efficient location estimation of the mobile terminal （MT）. By observing the estimation of the error covariance matrix in the two-step LS method, this paper finds that the measured distances are more suitable than the initial estimated distances by maximum likelihood （ML） algorithm in NLOS environments. Moreover, by making use of the geometry relations among fixed terminals （FTs）, some measured distances which are corrupted by big NLOS errors may be reduced. Further, an iteration method can be adopted to further improve the performance of the algorithm. Accordingly, an improved algorithm based on the two-step LS method is proposed. Simulation results demonstrate that the improved algorithm has better performance than the two-step LS method and converges more quickly. Meanwhile, it is robust in different NLOS environments.

关键词： NLOS propagation TOA least square position algorithm maximum likelihood

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Nano-scale compositional oscillation and phase intergrowth in Cu_(2)S_(0.5)Se_(0.5) and their role in thermal transport

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Journal of Materials Science & Technology 2021年第20期79卷 222-229页

作者： Yuyu Wei Ping Lu Chenxi Zhu Kunpeng Zhao xun shi Lidong Chen Fangfang Xu State Key Laboratory of High Performance Ceramics and Superfine Microstructures Shanghai Institute of CeramicsChinese Academy of Sciences(CAS)Shanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Solid solution alloying is a promising strategy to establish high performance *** alloying different elements,phase structures and phase compositions may vary accompanied by appearance of variety of interesting microstructures including mass fluctuation,lattice strain,nano-scale defects and spinodal decomposition,all of which may greatly influence the electrical and specifically the thermal transport of the *** the present study,atomic structures of Cu_(2)S_(0.5)Se_(0.5) solid solution have been examined by using atom-resolved electron microscopy in order to investigate the structure-correlated physical insights for the abnormal thermal transport in this solid *** the exceptional intergrowth nanostructures were *** solid solution consists of two high symmetrical phases,*** hexagonal and cubic phase,which alternately intergrow to form highly oriented ultra-thin lamellae of nano or even,unit cell *** compositional oscillation in Se/S atomic ratio during alloying is responsible for the phase stability and intergrowth *** unique binary phase intergrowth nanostructures make great contribution to the ultra-low lattice thermal conductivity comparable to glass and extremely short phonon mean free path of only 1.04Å,peculiar continuous hexagonal-to-cubic structural transformation without a critical transition temperature and its corresponding abnormal changes of thermal characters with *** present study further evokes the unlimited possibilities and potentials for tailoring nanostructures by alloying for improved thermoelectric performance.

关键词： Thermoelectric Solid solution Intergrowth nanostructures Compositional oscillation Structural transformation Thermal transport

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Mechanical and thermoelectric properties in Te-rich Ag_(2)(Te,S)metaphases

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Journal of Materiomics 2024年第3期10卷 543-551页

作者： Yumeng Wang Pengfei Qiu shiqi Yang Zhiqiang Gao Lidong Chen xun shi State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China

Ductile Ag_(2)(Te,S)pseudobinary compounds have attracted great attention in thermoelectric community since they can be fabricated into high-performance flexible and hetero-shaped thermoelectric ***,in spite of the numerous studies,the‘brittleeductile’transition boundary in Ag_(2)(Te,S)is still *** this work,a series of Te-rich Ag_(2)(Te,S)pseudobinary compounds have been *** structure characterizations confirm they belong to the new-concept of *** systematically investigation on the mechanical properties demonstrate that the‘brittl-eductile’transition boundary appears around x=*** good ductility is observed in the Te-rich Ag_(2)Te_(1-x)S_(x)crystalizing in the Ag_(2)Te room-temperature monoclinic structure and high-temperature cubic structure,which are thought to be brittle ***,Ag content is found to be a very critical parameter determining the ductility of Te-rich Ag_(2)Te_(1-x)S_(x).Very slight Ag-deficiency can greatly deteriorate the *** ther-moelectric properties of these ductile Te-rich Ag_(2)Te_(1-x)S_(x)pseudobinary compounds are investigated.A maximum thermoelectric figure-of-merit of 0.6 is obtained for Ag_(2)Te_(0.9)S_(0.1)at 600 *** work sheds light on the future investigation of Ag_(2)(Te,S)pseudobinary compounds.

关键词： Thermoelectric Ductility Ag_(2)S Mechanical property

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Preparation of Sulphur-containing Aromatic Amines by Reduction of the Corresponding Aromatic Nitro Compounds with Hydrazine Hydrate over Iron Oxide Hydroxide Catalyst

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Chinese Chemical Letters 2006年第8期17卷 1045-1047页

作者： Qi xun shi Rong Wen LU Zhu Xia ZHANG De Feng ZHAO State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116012

Sulphur-containing aromatic nitro compounds were rapidly reduced to the corresponding amines in high yields by employing hydrazine hydrate as a hydrogen donor in the presence of iron oxide hydroxide catalyst. It was worth noting that the catalyst exhibited extremely high activity. The reduction could be completed within 20-50 min and the yields were up to 97-99 %.

关键词： Iron oxide hydroxide catalyst hydrazine hydrate sulphur-containing aromatic nitro compounds reduction.

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Reduction of Sulphur-containing Aromatic Nitro Compounds with Hydrazine Hydrate over Iron(III) Oxide-MgO Catalyst

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Chinese Chemical Letters 2006年第4期17卷 441-443页

作者： Qi xun shi Rong Wen LU Zhu Xia ZHANG De Feng ZHAO State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116012

Sulphur-containing aromatic amines were prepared efficiently in good to excellent yields by reduction of the corresponding sulphur-containing aromatic nitro compounds with hydrazine hydrate in the presence of iron（Ⅲ） oxide-MgO catalyst. The catalyst exhibited high activity and stability for the reduction of sulphur-containing aromatic nitro compounds. The yields of sulphur-containing aromatic amines were up to 91-99 % at 355 K after reduction for 1-4 h over this catalyst.

关键词： Iron(Ⅲ) oxide-MgO catalyst hydrazine hydrate sulphur-containing aromatic nitro compounds reduction.

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