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Significantly improved high k dielectric performance:Rare earth oxide as a passivation layer laminated with TiO_(2) film

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Journal of Rare Earths 2023年第9期41卷 1376-1384,I0004页

作者： Shuan Li weipeng wang Youyu Lin Linlin wang Xingguo Li Beijing National Laboratory of Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing National Laboratory of Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

In order to achieve a super gate dielectric performance,rare earth oxides featuring for large band gap,good thermodynamic stability and relatively high k value were selected to be laminated with TiO_(2)film to prepare bilayer dielectric *** an example,the microstructure,morphology,band gap structure and electrical performance of TiO_(2)-Y_(2)O_(3)bilayer films were systematically *** show that stacking sequence of TiO_(2)and Y_(2)O_(3)sublayers has a significant impact on the dielectric performance and Y_(2)O_(3)film as a passivation layer can effectively improve electrical ***,the electrical behaviors analysis of TiO_(2)-Y_(2)O_(3),Y_(2)O_(3)-TiO_(2),Y_(2)O_(3)and TiO_(2)samples was carried out by impedance spectra and equivale nt *** result shows that TiO_(2)-Y_(2)O_(3)/Si sample holds the largest internal re sistance of 74665Ωamong four ***,the most outstanding properties of Pt/TiO_(2)-Y_(2)O_(3)/Si capacitor are achieved by varying the thickness of sublayers and annealing temperature.500℃-annealed bilayer film with 17 nm-TiO_(2)and 3-nm Y_(2)O_(3)displays a k value of 28.24,which is more than 1.4 times that of current commercial HfO_(2).Further,Schottky emission was determined to be leakage current transport mechanism for TiO_(2)-Y_(2)O_(3)bilayer *** by this result,the electrical performance of more general Pt/TiO_(2)-REOs/Si MOS capacitors(RE=Sc,La,Ce,Gd and Pr)was *** combination of TiO_(2)film and REOs passivation layer with the satisfying performance provides promising candidates for future Si-based integrated circuit(IC).

关键词： Rare earth oxides Gate dielectric Thin film Sputtering Passivation layer

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Study on response of metal wire in thermoacoustic imaging

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Journal of Innovative Optical Health Sciences 2022年第3期15卷 45-53页

作者： Zheng Liang weipeng wang Shuaiqi Qiao Lin Huang School of Electronic Science and Engineering(National Exemplary School of Microelectronics)University of Electronic Science and Technology of China Chengdu 611731 P.R.China Center for Information in Medicine University of Electronic and Technology of China Chengdu 611731 P.R.China

Thermoacoustic imaging(TAI)is an emerging high-resolution and high-contrast imaging *** recent years,metal wires have been used in TAI experiments to quantitatively evaluate the spatial resolution of different ***,there is still a lack of analysis of the response characteristics and principles of metal wires in *** theoretical and simulation analyses,this paper proposes that the response of metal(copper)wires during TAI is equivalent to the response of *** critically,the response of the copper wire is equivalent to the response of a half-wave dipole *** its length is close to half the wavelength of the incident electromagnetic wave,it obtains the best *** simulation,when the microwave excitation frequencies are 1.3 GHz,3.0 GHz,and 5.3 GHz,and the lengths of copper wires are separately set to 11 cm,5 cm,and 2.5 cm,the maximum SAR distribution and energy coupling effciency are *** result is connected with the best response of half-wave dipole antennas with lengths of 11 cm,4.77 cm,and 2.7 cm under the theoretical design,*** the further application,TAI can be used to conduct guided minimally invasive surgery on surgical instrument ***,this paper indicated that results can also guide the design of metal surgical instruments utilized in different microwave frequencies.

关键词： Thermoacoustic imaging simulation metal wire antenna

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A Hybrid Handover Forecasting Mechanism Based on Fuzzy Forecasting Model in Cellular Networks

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China Communications 2018年第6期15卷 84-97页

作者： Hua Qu Yanpeng Zhang Jihong Zhao Gongye Ren weipeng wang School of Software Engineering Xi'an Jiaotong Univ.Xi'an 710049China School of Electronics and Information Engineering Xi'an Jiaotong Univ.Xi'an 710049China School of Communication and Information Engineering Xi'an Univ.of Posts&TelecommunicationXi'an 710061China Suzhou Caiyun Networking Technologies Co. Ltd.Suzhou 215000China

As the increasing demand for mobile communications and the shrinking of the coverage of cells, handover mechanism will play an important role in future wireless networks to provide users with seamless mobile communication services. In order to guarantee the user experience, the handover decision should be made timely and reasonably. To achieve this goal, this paper presents a hybrid handover forecasting mechanism, which contains long-term and short-term forecasting models. The proposed mechanism could cooperate with the standard mechanisms, and improve the performance of standard handover decision mechanisms. Since most of the parameters involved are imprecise, fuzzy forecasting model is applied for dealing with predictions of them. The numerical results indicate that the mechanism could significantly decrease the rate of ping-pong handover and the rate of handover failure.

关键词： handover forecasting mechanism fuzzy forecasting model long-term forecasting model short-term forecasting model

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Defects-Driven Ferromagnetism in Undoped Dilute Magnetic Oxides:A Review

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Journal of Materials Science & Technology 2015年第10期31卷 969-978页

作者： Shuai Ning Peng Zhan Qian Xie weipeng wang Zhengjun Zhang State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua University Key Laboratory of Advanced Materials (MOE) School of Materials Science and EngineeringTsinghua University

In the past several decades, dilute magnetic semiconductors, particularly the dilute magnetic oxides have evolved into an important branch of materials science due to their potential application in spintronic devices combining of properties of semiconductors and ferromagnets. In spite of a major effort devoted to the mechanism of ferromagnetism with a high Curie temperature in these materials, it still remains the most controversial research topic, especially given the unexpected d0 ferromagnetism in a series of undoped wide-band-gap oxides films or nanostructures. Recently, an abundance of research has shown the critical role of various defects in the origin and control of spontaneous magnetic ordering, but contradicting views from intertwined theoretical calculations and experiments require more in-depth systematic research. In our previous work, considerable efforts have been focused on two major oxides, i.e. ZnO and ZrO 2. This review will present a summary of current experimental status of this defect-driven ferromagnetism in dilute magnetic oxides(DMOs).

关键词： Dilute magnetic oxides Defects ZnO ZrO2

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Essential training steps to achieving competency in the basic intraoperative transesophageal echocardiography examination for Chinese anesthesiologists

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Frontiers of Medicine 2015年第1期9卷 123-128页

作者： Yong G. Peng Haibo Song E. wang weipeng wang Jin Liu Department of Anesthesiology College of Medicine University of Florida Shands Hospital Gainesville FL 32610 USA Department of Anesthesiology West China Hospital of Sichuan University Chengdu 610041 China Department of Anesthesiology Xiangya Hospital of Central South University Changsha 410008 China Department of Anesthesiology Fuwai Hospital and Cardiovascular Institute Chinese Academy of Medical Sciences & Peking Union Medical College Beijing 100037 China

Guidelines for the intraoperative transesophageal echocardiography （TEE） examination have defined a detailed standard for medical professionals, particularly anesthesiologists, on how a TEE exam should proceed. Over the years, TEE has gained substantial popularity and emerged as a preferred monitoring modality to aid in perioperative management and decision making during hemodynamic instability situations or critical care settings. TEE training pathways and practice guidelines have been well established in western countries and many regions of the world. However, TEE training and practice information for anesthesiologists are lacking in China. As innovative technologies develop, other educational models have emerged to aid in obtaining competency in basic TEE exam. Hence, establishing a consensus on the ideal TEE training approach for anesthesiologists in China is urgently needed. Developing an effective curriculum that can be incorporated into an anesthesiology resident＇s overall training is also necessary to provide knowledge and skills toward competency in basic TEE exam. With evolving medical system reforms and increasing demands for intraoperative hemodynamic monitoring to accommodate surgical innovations, anesthesiology professionals are increasingly obliged to perform intraoperative TEE exams in their current and future practices. To overcome obstacles and achieve significant progress in using the TEE modality to help in intraoperative management and surgical decision making, publishing basic TEE training guidelines for China＇s anesthesiologists is an important endeavor.

关键词： transesophageal echocardiography guidelines training competency

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Wettability manipulation nanorod arrays of magnetic transition metal by X-ray irradiation

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Frontiers of Materials Science 2015年第3期9卷 311-316页

作者： Qian XIE weipeng wang Zheng XIE Shuang SHUANG Zhengcao LI Zhengjun ZHANG Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University Beijing 100084 China High-Tech Institute of Xi'an Xi'an 710025 China

Wettability manipulation of glancing angle deposited Fe/Co/Ni nanorod arrays was realized by X-ray irradiation in ultra-high vacuum chamber. Reversible transition was also purchased by alternating ethanol immersion and X-ray irradiation. Alkyl group adsorption-desorption mechanism and corresponding morphology depen- dence of wettability manipulation were revealed.

关键词： wettability nanorod array transition metal X-ray irradiation

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Thickness dependence of the crystallization and phase transition in ZrO_(2)thin films

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Journal of Advanced Ceramics 2023年第4期12卷 822-829页

作者： Yue Guan Jing Zhou Haodong Zhong weipeng wang Zhengjun Zhang Feng Luo Shuai Ning School of Materials Science and Engineering Smart Sensing Interdisciplinary Science CenterNankai UniversityTianjin 300350China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

Fluorite-structure binary oxides(e.g.,HfO_(2)and ZrO_(2))have attracted increasing interest for a broad range of applications including thermal barrier coatings,high-k dielectrics,and novel ferroelectrics.A crystalline structure plays a crucial role in determining physical and chemical *** evolution of ZrO_(2)thin films,particularly down to the nanometer scale,has not been thoroughly *** this work,we carried out systematic annealing analysis on the ZrO_(2)thin *** in-situ high-temperature X-ray diffraction(XRD)characterizations,a thickness dependence of crystallization and phase transition is *** of the thickness(10-300 nm),the as-prepared amorphous ZrO_(2)thin films are preferentially crystallized into a tetragonal(t)structure(high-temperature phase),which can be preserved down to room temperature(RT)upon anncaling at the corresponding crystallization temperaturc(T).When anncaling at temperaturcs higher than Tc,the transition from t to monoclinic(m;RT phase)will occur,and the quantity of the transition strongly depends on the film *** work expands the basic understanding of the phase transition in the ZrO_(2)thin films,and offers a path to the selective control over the phase structure for novel functionalities.

关键词： zirconia crystallization tetragonal(t) monoclinic(m) phase transition

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Large focal length planar focusing of Dyakonov polaritons in hyperbolic metamaterial

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Progress in Natural Science:Materials International 2024年第4期34卷 632-636页

作者： Xiaoyu Xiong Yihang Fan weipeng wang Yongzheng Wen Zhengjun Zhang Jingbo Sun Ji Zhou State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University

Achieving subwavelength optical focusing is of great importance in nanophotonics. However, achieving focusing with both a small focal spot size and a large focal length remains elusive so far. Here, a large focal length planar focusing device is presented, utilizing highly oriented Dyakonov polaritons in hyperbolic metamaterial with periodic silver rings as the excitation source. Experimental results show that by controlling the size of the excitation sources, the focal length can reach 6λ0（where λ0is the illumination wavelength）, and the focal spot size can be reduced to λ0/10. This method provides new prospects for planar polariton optical applications.

关键词： Subwavelength optical focusing Dyakonov polaritons In-plane hyperbolic metamaterials Near-field optics

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Microwave-induced thermoacoustic elastic imaging:A simulation study

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Journal of Innovative Optical Health Sciences 2024年第2期17卷 1-11页

作者： Lin Huang Zheng Liang Shuaiqi Qiao weipeng wang School of Electronic Science and Engineering(National Exemplary School of Microelectronics)University of Electronic Science and Technology of China ChengduP.R.China Zhangjiang Laboratory 100 Haike Road Shanghai 201204P.R.China

Microwave-induced thermoacoustic imaging(MTI)has the advantages of high resolution,high contrast,non-ionization,and ***,MTI was used in the¯eld of breast cancer *** this paper,based on the¯nite element method(FEM)and COMSOL Multiphysics software,a three-dimensional breast cancer model suitable for exploring the MTI process is proposed to investigate the in°uence of Young's modulus(YM)of breast cancer tissue on *** is found that the process of electromagnetic heating and initial pressure generation of the entire breast tissue is earlier in time than the thermal expansion ***,compared with normal breast tissue,tumor tissue has a greater temperature rise,displacement,and pressure *** particular,YM of the tumor is related to the speed of thermal *** particular,the larger the YM of the tumor is,the higher the heating and contraction frequency is,and the greater the maximum pressure ***®erent Young's moduli correspond to di®erent thermoacoustic signal *** MTI,this study can be used to judge di®erent degrees of breast cancer based on elastic *** addition,this study is helpful in exploring the possibility of microwave-induced thermoacoustic elastic imaging(MTAE).

关键词： Thermoacoustic imaging breast cancer multi-physics simulation elastic imaging

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Magnetic Anisotropy Induced by Orbital Occupation States in La_(0.67)Sr_(0.33)MnO_(3) Films

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Chinese Physics Letters 2021年第8期38卷 115-120页

作者： Huaixiang wang Jinghua Song weipeng wang Yuansha Chen Xi Shen Yuan Yao Junjie Li Jirong Sun Richeng Yu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physics Sciences University of Chinese Academy of SciencesBeijing 100049China

Interface engineering is an effective and feasible method to regulate the magnetic anisotropy of films by altering interfacial states between *** the technique of pulsed laser deposition,we prepared La_(0.67)Sr_(0.33)MnO_(3)(LSMO)and La_(0.67)Sr_(0.33)MnO_(3)/SrCoO_(2.5)(LSMO/SCO)films on(110)-oriented La_(0.3)Sr_(0.7)Al_(0.65)Ta_(0.35)O_(3) *** covering the SCO film above the LSMO film,we transformed the easy magnetization axis of LSMO from the[001]axis to the[110]axis in the film *** on statistical analyses,we find that the corresponding Mn-Mn ionic distances are different in the two types of LSMO films,causing different distortions of Mn-O octahedron in *** addition,it also induces diverse electronic occupation states in Mn^(3+)*** e_(g) electron of Mn^(3+)occupies 3z^(2)-r^(2) and x^(2)-y^(2) orbitals in the LSMO and LSMO/SCO,*** conclude that the electronic spin reorientation leads to the transformation of the easy magnetization axis in the LSMO films.

关键词： film magnetization occupation

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