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Improving interfacial and electrical properties of HfO_(2)/SiO_(2)/p-Si stacks with N_(2)-plasma-treated SiO_(2) interfacial layer

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Rare Metals 2023年第6期42卷 2081-2086页

作者： Xiao-Qiang Chen Yu-Hua Xiong Jun Du Feng Wei Hong-Bin Zhao Qing-Zhu Zhang Wen-Qiang Zhang Xiao-Ping Liang Advanced Electronic Materials Institute General Research Institute for Nonferrous MetalsBeijing100088China State Key Laboratory of Advanced Materials for Smart Sensing General Research Institute for Nonferrous MetalsBeijing100088China Key Laboratory of Microelectronics Devices and Integrated Technology Institute of MicroelectronicsChinese Academy of SciencesBeijing100029China

The effect of N_(2)-plasma-treated SiO_(2) interfacial layer on the interfacial and electrical characteristics of HfO_(2)/SiO_(2)/p-Si stacks grown by atomic layer deposition(ALD) was *** microstructure and interfacial chemical bonding configuration of the HfO_(2)/SiO_(2)/Si stacks were also examined by high-resolution transmission electron microscopy(HRTEM) and X-ray photoelectron spectroscopy(XPS).Compared with the samples without N2-plasma treatment,it is found that the samples with N2-plasma treatment have less oxygen vacancy density for SiO_(2) interfacial layer and better HfO_(2)/SiO_(2) *** agreement with XPS analyses,electrical measurements of the samples with N2-plasma treatment show better interfacial quality,including lower interface-state density(Dit,9.3 × 1011 cm^(-2)·eV^(-1) near midgap) and lower oxidecharge density(Q_(ox),2.5 × 1012 cm^(-2)),than those of the samples without N_(2)-plasma ***,the samples with N_(2)-plasma treatment have better electrical performances,including higher saturation capacitance density(1.49 μF·cm^(-2)) and lower leakage current density(3.2 × 10^(-6) A·cm^(-2) at V_(g)=V_(fb)-1 V).Furthermore,constant voltage stress was applied on the gate electrode to investigate the reliability of these *** shows that the samples with N_(2)-plasma treatment have better electrical stability than the samples without N_(2)-plasma treatment.

关键词： Metal-oxide-semiconductor High-k Atomic layer deposited N_(2)-plasma treatment interfacial characteristic Reliability

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Mesoscopic Modeling Approach and Application for Steel Fiber Reinforced Concrete under Dynamic Loading:A Review

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Engineering 2022年第9期16卷 220-238页

作者： Jinhua Zhang Zhangyu Wu Hongfa Yu Haiyan Ma Bo Da School of Civil Engineering Southeast UniversityNanjing 210096China Department of Civil and Airport Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Science and Technology on Near-Surface Detection Laboratory Wuxi 214035China College of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing 210098China

Steel fiber reinforced concrete(SFRC)has drawn extensive attention in recent years for its superior mechanical response to dynamic and impact *** on the existing test results,the highstrength steel fibers embedded in a concrete matrix usually play a strong bridging effect to enhance the bonding force between fiber and the matrix,and directly contribute to the improvement of the post-cracking behavior and residual strength of *** gain a better understanding of the action behavior of steel fibers in matrix and further capture the failure mechanism of SFRC under dynamic loads,the mesoscopic modeling approach that assumes SFRC to be composed of different mesoscale phases(i.e.,steel fibers,coarse aggregates,mortar matrix,and interfacial transition zone(ITZ))has been widely employed to simulate the dynamic responses of SFRC material and structural *** paper presents a comprehensive review of the state-of-the-art mesoscopic models and simulations for SFRC under dynamic *** approaches for the SFRC mesoscale model in the simulation works,including steel fiber,coarse aggregate,and the ITZ between them,are reviewed and compared *** material models for different phases and the interaction relationship between fiber and concrete matrix are summarized ***,some example applications for SFRC under dynamic loads(i.e.,compression,tension,and contact blast)simulated using the general mesoscale models are ***,some critical analysis on the current shortcomings of the mesoscale modeling of SFRC is highlighted,which is of great significance for the future investigation and development of SFRC.

关键词： Steel fiber reinforced concrete Mesoscale modeling Dynamic loading Materials model interfacial characteristic

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高导热碳复合材料

高导热碳复合材料

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2015年第十四届全国应用化学年会

作者：冯奕钰秦盟盟封伟天津市材料复合与功能化重点实验室天津大学材料科学与工程学院

＜正＞航空航天、卫星通讯、高速计算机等领域的快速发展对热管理材料提出了更高的要求。碳材料因具有低密度、高强度、高导热系数、耐化学腐蚀等优异性能,有望取代传统的金属材料而成为下一代的界面高导热材料。[1-3]然而由于碳原子特... 详细信息

＜正＞航空航天、卫星通讯、高速计算机等领域的快速发展对热管理材料提出了更高的要求。碳材料因具有低密度、高强度、高导热系数、耐化学腐蚀等优异性能,有望取代传统的金属材料而成为下一代的界面高导热材料。[1-3]然而由于碳原子特殊的排列方式,碳纤维、石墨烯、碳纳米管等碳材料存在巨大的结构和导热性能各向异性,即在石墨晶面方向具有高的导热系数,而在晶面之间导热系数很小,材料制备过程中的择优取向限制了其在厚度方向上的导热能

关键词： carbon materials order structures thermal conductivity interfacial characteristic

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