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Laser pulse tuning for optimized photodetector performance in CsPbI3/Si heterojunctions

Optical and Quantum Electronics 2025年第1期57卷 1-25页

作者： Hussein, Sahar I. Ismail, Raid A. Almashhadani, Nahida J. Addie, Ali J. Applied Science Department University of Technology Baghdad Iraq Center of Industrial Applications and Materials Technology Scientific Research Commission Baghdad Iraq

Cesium lead iodide (CsPbI3) is a promising material for optoelectronic applications due to its high absorption coefficients, long carrier diffusion lengths and tunable energy gap. This study investigates the influence of the number of laser pulses on the structural, optical and electrical properties of CsPbI3 films deposited on silicon substrates by pulsed laser deposition (PLD). X-ray diffraction and scanning electron microscopy analysis shows that increasing the laser pulses from 40 to 130 leads to an improvement in the crystallinity of the films, transforming isolated crystallites into a dense interconnected network. Optical characterization shows that films deposited with 100 pulses have an ideal band gap of 2.4 eV. Hall effect measurements show that films with 70 pulses have the highest carrier mobility of 25 cm2/Vs, while films with 100 pulses achieve a balance between a high carrier concentration of 1.2 × 1018 cm− 3 and a low resistivity of 5 × 10− 5 Ω.cm, indicating optimal electrical properties. The CsPbI3/Si photodetectors fabricated with 100 pulses show excellent performance with responsivity of 6.7 A/W, a detectivity of 1 × 1012 Jones and a quantum efficiency of 12 × 102% at 600 nm. This work demonstrates the importance of optimizing the PLD laser pulses to control the film properties for high performance photodetectors. © The Author(s), under exclusive licence to Springer science+Business Media, LLC, part of Springer Nature 2024.

关键词： Perovskite

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Low-temperature synthesis of Sm-Fe binary compounds by reduction-diffusion process using an eutectic salt solvent

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Rare Metals 2023年第5期42卷 1724-1731页

作者： Jungryang Kim Shusuke Okada Kenta Takagi Magnetic Powder Metallurgy Research Center National Institute of Advanced Industrial Science and Technology(AIST)NagoyaAichi463-8560Japan

In this study,the temperature of the low-temperature reduction-diffusion(LTRD)process was successfully decreased to below 600℃by introducing LiClKCl eutectic molten salt with a low eutectic point(352℃)as a solvent for Ca ***,the Sm-Fe binary compounds,which were synthesizable at previously-unexplored low temperatures by the LTRD process using LiCl-KCl eutectic molten salt,were investigated,including whether a new metastable or ThMn_(12)-type Sm-Fe binary phase was *** Sm-Fe phase transitions of the SmFe binary compounds at a low temperature were identified,and it was found that MgCu_(2)-type Sm-Fe,PuNi_(3)-type SmFe and TbCu_(7)-type Sm-Fe phases were synthesized and stable at 400,500 and 550℃*** no new metastable Sm-Fe and ThMn_(12)-type Sm-Fe compounds were discovered in this study,this work can demonstrate that it is possible to synthesize the Sm-Fe phase at very low temperatures by the LTRD process for the first time.

关键词： Low-temperature synthesis Reductiondiffusion process Molten salts Hard magnet Sm-Fe compounds

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Near-field radiative heat transfer between nanoporous GaN films

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Chinese Physics B 2024年第4期33卷 109-120页

作者：韩晓政张纪红刘皓佗吴小虎冷惠文 School of Electromechanical and Automotive Engineering Yantai UniversityYantai 264005China Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of EducationHarbin University of Science and TechnologyHarbin 150080China Thermal Science Research Center Shandong Institute of Advanced TechnologyJinan 250100China

Photon tunneling effects give rise to surface waves,amplifying radiative heat transfer in the near-field *** research has highlighted that the introduction of nanopores into materials creates additional pathways for heat transfer,leading to a substantial enhancement of near-field radiative heat transfer(NFRHT).Being a direct bandgap semiconductor,GaN has high thermal conductivity and stable resistance at high temperatures,and holds significant potential for applications in optoelectronic ***,study of NFRHT between nanoporous GaN films is currently lacking,hence the physical mechanism for adding nanopores to GaN films remains to be discussed in the field of *** this work,we delve into the NFRHT of GaN nanoporous films in terms of gap distance,GaN film thickness and the vacuum filling *** results demonstrate a 27.2%increase in heat flux for a 10 nm gap when the nanoporous filling ratio is ***,the spectral heat flux exhibits redshift with increase in the vacuum filling *** be more precise,the peak of spectral heat flux moves fromω=1.31×10^(14)rad·s^(-1)toω=1.23×10^(14)rad·s^(-1)when the vacuum filling ratio changes from f=0.1 to f=0.5;this can be attributed to the excitation of surface phonon *** introduction of graphene into these configurations can highly enhance the NFRHT,and the spectral heat flux exhibits a blueshift with increase in the vacuum filling ratio,which can be explained by the excitation of surface plasmon *** findings offer theoretical insights that can guide the extensive utilization of porous structures in thermal control,management and thermal modulation.

关键词： near-field radiative heat transfer nanoporous GaN film surface phonon polaritons surface plasmon polaritons

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The Kirkendall effect on erosion resistance of chrome-coated 25Cr3Mo2WNiV and 30SiMn2MoV gun barrel steels

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Journal of Materials science & technology 2024年第10期177卷 246-255页

作者： C.H.Dou P.F.Jin C.Z.Wang J.J.Li C.Zhang J.F.Huang C.Zhang Key Laboratory for Advanced Materials Processing State State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials School of Materials Science and EngineeringHenan University of Science and TechnologyLuoyang 471003China

This study aimed to investigate the erosion behavior and mechanism of a newly developed 25Cr3Mo2WNiV steel with a chrome coating using promoted ignition combustion *** erosion threshold pressure and temperature of the chrome-coated 25Cr3Mo2WNiV steel were determined to be 0.2 MPa and 254.3 K higher than those of traditional chrome-coated 30SiMn2MoV ***,Kirkendall voids and inter-diffusion between the Cr coating and matrix were first observed before *** improved erosion resistance of the chrome-coated 25Cr3Mo2WNiV steel was attributed to the suppression of the Kirkendall effect,which minimized heat generation at the Cr/matrix interface by pre-venting oxygen diffusion and reducing oxygen affinity.

关键词： Erosion resistance Kirkendall effect Cr coating Gun steel

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Side Chain Crosslinked Anion Exchange Membrane for Acid Concentration by Electrodialysis

Chem and Bio Engineering

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Chem and Bio Engineering 2024年第7期1卷 647-657页

作者： He, Haoyang Chen, Qian Fu, Rongqiang Liu, Zhaoming Ge, Liang Xu, Tongwen Key Laboratory of Precision and Intelligent Chemistry School of Chemistry and Materials Science University of Science and Technology of China Hefei230026 China Applied Engineering Technology Research Center for Functional Membranes Institute of Advanced Technology University of Science and Technology of China Hefei230088 China Shandong Tianwei Membrane Technology Co. LTD Weifang262737 China

Electrodialysis (ED) technology for waste acid treatment has high economic efficiency and environmentally friendly advantages. The primary limitation of ED in the retrieval of low-concentration spent acids lies in the leakage of hydrogen ions through anion exchange membranes (AEMs) due to its extremely small size and high mobility. To address this issue, a series of AEMs named QPAB-x (x = 3, 5, 7, 10) were designed for acid concentration in ED process by increasing the membrane densities through in situ crosslinking in this study. The successful synthesis of polymers was confirmed through 1H nuclear magnetic resonance hydrogen (1H NMR) spectroscopy and Attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy. Furthermore, ATR-FTIR spectroscopy showed that the higher the side chain content, the higher the crosslinking degree of the membranes. X-ray photoelectron spectroscopy (XPS) was employed to characterize the effects of aqueous and acidic environments on QPAB membranes. The performance disparities between QPAB-x membranes in acidic and aqueous environments were examined separately. Subsequently, the influence of crosslinking degree on the acid-blocking capability of the membranes was thoroughly investigated by conducting ED acid-concentration experiments to monitor the hydrogen ions concentration process and determine the current efficiency and energy consumption of the QPAB-x membranes. Our experimental results demonstrated that QPAB-x membranes with higher cross-linking degrees have lower water content, especially the QPAB-10 membrane with an IEC of approximately 1.5 mmol g-1 and a remarkably low water content of around 10%. This leads to a reduced H+ transfer number and excellent acid-blocking properties. Additionally, compared to commercial membrane A2, using the QPAB-10 membrane in the ED process resulted in a higher final H+ concentration in the concentrated chamber. Consequently, these synthesized membranes exhibit considerable promis

关键词： Fourier transform infrared spectroscopy

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Copper Precipitation Behavior and Mechanical Properties of Cu‑Bearing Ferritic Stainless Steel with Diferent Cr Addition

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Acta Metallurgica Sinica(English Letters) 2025年第3期38卷 383-395页

作者： Yifan Li Shengyao Ma Xinrui Zhang Tong Xi Chunguang Yang Hanyu Zhao Ke Yang Henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou 450001China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

The microstructure evolution and mechanical properties of Cu-bearing ferritic stainless steel with diferent Cr addition(Cr=12,15 and 17 wt%)were *** phase transformation behavior under diferent cooling rate,Cu-rich precipitation behavior and its infuence on the mechanical properties under diferent aging treatment are systematically characterized using dilatometry,diferential scanning calorimeter(DSC)and transmission electron microscopy(TEM).The results indicated that the increase in Cr content narrowed the austenite phase region at high temperatures,afecting its microstructure under diferent cooling *** 12Cr-1.5Cu steel exhibited a fully austenitic phase region at high temperature and occurred apparent martensitic transformation after air *** rate signifcantly infuenced the phase transition of the steels,and subsequently afected its mechanical *** three investigated steels showed higher strength and lower plasticity in air cooling condition compared to furnace cooling condition,due to the presence of *** aging treatment,high number densities of Cu-rich precipitates were formed in steel matrix and the size of Cu-rich precipitates increased obviously with increasing aging temperature,while the tendency for number density was *** and dispersed Cu-rich precipitates formed during low-temperature aging enhanced strength of the steels,while larger Cu-rich phases developed during high-temperature aging endowed greater ductility to the ***,the Cr content had no signifcant efect on the precipitation behavior of Cu-rich *** comprehensive results and analyses could provide a solid foundation for broader applications of Cu-bearing ferritic stainless steels.

关键词： Cu-bearing stainless steel Mechanical property Cu-rich precipitate Microstructure

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Activating sulfur oxidation reaction via six-electron redox mesocrystal NiS2 for sulfur-based aqueous batteries

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National science Review 2023年第6期10卷 64-74页

作者： Zhoudong Yang Boya Wang Yongjin Chen Wanhai Zhou Hongpeng Li Ruizheng Zhao Xinran Li Tengsheng Zhang Fanxing Bu Zaiwang Zhao Wei Li Dongliang Chao Dongyuan Zhao Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials College of Chemistry and Materials Fudan University Center for High Pressure Science and Technology Advanced Research

Sulfur-based aqueous batteries（SABs） are deemed promising candidates for safe,low-cost,and high-capacity energy ***,despite their high theoretical capacity,achieving high reversible value remains a great challenge due to the thermodynamic and kinetics problems of elemental ***,the reversible six-electron redox electrochemistry is constructed by activating the sulfur oxidation reaction（SOR） process of the elaborate mesocrystal NiS2（M-NiS2）.Through the unique 6e-solid-to-solid conversion mechanism,SOR efficiency can reach an unprecedented degree of ca.96.0%.The SOR efficiency is further reve aled to be closely associated with the kinetics feasibility and thermodynamic stability of the M-NiS2intermedium in the formation of elemental *** from the boosted SOR,compared with the bulk electrode, the M-NiS2electrode exhibits a high reversible capacity(1258 mAh g-1),ultrafast reaction kinetics(932 mAh g-1at 12 A g-1),and long-term cyclability(2000 cycles at 20 A g-1).As a proof of concept,a new M-NiS2‖ Zn hybrid aqueous battery exhibits an output voltage of 1.60 V and an energy density of 722.4 Wh kgcath-1,which opens a new opportunity for the development of high-energy aqueous batteries.

关键词： sulfur-based aqueous battery mesocrystal material sulfur oxidation reaction high-energy aqueous battery six-electron redox

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Phase-field simulations of the effect of temperature and interface for zirconiumδ-hydrides

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Chinese Physics B 2024年第4期33卷 701-710页

作者：陈子航盛杰刘瑜施小明黄厚兵许可王越超武帅孙博刘海风宋海峰 School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China Department of Physics University of Science and Technology BeijingBeijing 100083China

Hydride precipitation in zirconium cladding materials can damage their integrity and *** temperature and material defects have a significant effect on the dynamic growth of *** this study,we have developed a phasefield model based on the assumption of elastic behaviour within a specific temperature range(613 K-653 K).This model allows us to study the influence of temperature and interfacial effects on the morphology,stress,and average growth rate of zirconium *** results suggest that changes in temperature and interfacial energy influence the length-to-thickness ratio and average growth rate of the hydride *** ultimate determinant of hydride orientation is the loss of interfacial coherency,primarily induced by interfacial dislocation defects and quantifiable by the mismatch degree *** escalation in interfacial coherency loss leads to a transition of hydride growth from horizontal to vertical,accompanied by the onset of redirection ***,redirection occurs at a critical mismatch level,denoted as qc,and remains unaffected by variations in temperature and interfacial ***,this redirection leads to an increase in the maximum stress,which may influence the direction of hydride crack *** research highlights the importance of interfacial coherency and provides valuable insights into the morphology and growth kinetics of hydrides in zirconium alloys.

关键词： zirconium hydride phase-field method temperature effect mismatch degree

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Development of 3-Channel Inspection Analysis Technique for Defects of SiC Epitaxial Wafers Using Optical Inspection, Photoluminescence and X-Ray Topography

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Defect and Diffusion Forum 2024年 434卷 143-147页

作者： Senzaki, Junji Nishino, Junichi Osanai, Tsutomu Advanced Power Electronics Research Center National Institute of Science and Technology 16-1 Onogawa Ibaraki Tsukuba Japan

3-channel analysis technique consisting of optical inspection, photoluminescence and Xray topography methods for defect inspection of SiC epitaxial wafers has been investigated. The effectiveness of SiC wafer inspection image correction to enable automatic defect analysis is verified. Next, it is shown that the 3-channel analysis technique improves SiC defect inspection accuracy compared to conventional 2-channel analysis one. © 2024 The Author(s).

关键词： Silicon wafers

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Cyclic quenching treatment doubles the Charpy V-notch impact energy of a 2.3 GPa maraging steel

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材料科学技术（英文版） 2025年第6期209卷 311-328页

作者： Xinlei Zhou Chunni Jia Peng Mi Honglin Zhang Wei Yan Wei Wang Mingyue Sun Sybrand van der Zwaag Lijian Rong School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016PR China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016PR China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016PR China China Aerodynamics Research and Development Center Mianyang 621000PR China Faculty of Aerospace Engineering Delft University of TechnologyDelftNetherlands

A cyclic quenching treatment(CQT)succeeded in turning a 2.3 GPa maraging steel with a Charpy impact energy of 9 J into a new grade with the same strength but a Charpy impact energy of 20 J upon 4 cyclic *** improvement of mechanical properties is attributed to the refinement and increased chemical heterogeneity of the martensitic substructure,rather than the refinement of prior austenite grain(PAG),as well as the Transformation-Induced Plasticity(TRIP)effect facilitated by small austenite *** role of local segregation of Ni during CQT in the formation of Ni-rich austenite grains,Ni-rich martensite laths and Ni-poor martensite laths,was investigated and verified by DICTRA *** study highlights the important influence of Ni partitioning behavior during CQT,providing insights into microstructural evolution and mechanical properties.

关键词： Maraging steel Cyclic quenching treatment Ni partitioning Ultrafine lath Austenite Toughness

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