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Modeling of high permittivity insulator structure with interface charge by charge compensation
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作者 Zhi-Gang Wang Yun-Feng Gong Zhuang Liu 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第2期646-654,共9页
An analytical model of the power metal–oxide–semiconductor field-effect transistor(MOSFET)with high permittivity insulator structure(HKMOS)with interface charge is established based on superposition and developed fo... An analytical model of the power metal–oxide–semiconductor field-effect transistor(MOSFET)with high permittivity insulator structure(HKMOS)with interface charge is established based on superposition and developed for optimization by charge compensation.In light of charge compensation,the disturbance aroused by interface charge is efficiently compromised by introducing extra charge for maximizing breakdown voltage(BV)and minimizing specific ON-resistance(R_(on,sp)).From this optimization method,it is very efficient to obtain the design parameters to overcome the difficulty in implementing the R_(on,sp)–BV trade-off for quick design.The analytical results prove that in the HKMOS with positive or negative interface charge at a given length of drift region,the extraction of the parameters is qualitatively and quantitatively optimized for trading off BV and Ron,sp with JFET effect taken into account. 展开更多
关键词 charge compensation breakdown voltage high permittivity interface charge super-junction
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A novel Na_(1−x)K_(x)TaO_(3)perovskite microwave dielectric ceramic with high permittivity and high positive temperature coefficient 被引量:1
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作者 Liu Tang Hongcheng Yang +1 位作者 Enzhu Li Chaowei Zhong 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2023年第11期2053-2061,共9页
A novel Na_(1−x)K_(x)TaO_(3)(x=0,0.025,0.05,0.075,0.1,and 0.15)ceramic with high permittivity and high positive temperature coefficient was synthesized via the conventional solid-state method.All samples were determin... A novel Na_(1−x)K_(x)TaO_(3)(x=0,0.025,0.05,0.075,0.1,and 0.15)ceramic with high permittivity and high positive temperature coefficient was synthesized via the conventional solid-state method.All samples were determined to be pure phase orthorhombic NaTaO3 structure of space group Pmcn,and larger grain and lower porosity were observed after adding an appropriate amount of K+ions.The Q×f value is majored by the packing fraction and grain size,while the value ofτf is influenced by Ta–O bond valence.The Na_(0.95)K_(0.05)TaO_(3) ceramic possesses excellent dielectric properties ofεr=164.29,Q×f=9091 GHz(f=3.15 GHz),tanδ=3.46×10^(–4),τf=+809.52 ppm/℃,sintered at 1550℃.Compared with NaTaO_(3) ceramics,the Na_(1−x)K_(x)TaO_(3)ceramics prepared in this study demonstrate higher dielectric constants and higher positive temperature coefficients,which are promising for device miniaturization andτf compensators. 展开更多
关键词 Na_(1−x)K_(x)TaO_(3)ceramics high permittivity high positive temperature coefficient PEROVSKITE
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Enhanced radiation characteristics for antipodal Vivaldi antenna using high permittivity dielectric director
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作者 Rabiaa Herzi Moufida Bouslama Ali Gharsallah 《Journal of Advanced Dielectrics》 CAS 2017年第3期24-28,共5页
In this paper,we investigate the influence of higher permittivity dielectric director on the radiation performances of an antipodal Vivaldi antenna.An elliptical dielectric director with high permittivity is inserted ... In this paper,we investigate the influence of higher permittivity dielectric director on the radiation performances of an antipodal Vivaldi antenna.An elliptical dielectric director with high permittivity is inserted in an antipodal Vivaldi antenna aperture in order to ameliorate the radiation characteristics of the antenna.Due to the capacity of elevated permittivity dielectric to confine and guide energy in the desired direction,an increment of 4 dB in the gain of the antenna is obtained.This antenna,which covers an ultra-wide frequency band of 146.8%from 2.3 GHz to 15 GHz,has approximately regular radiation patterns with reduced side lobe level and narrower beamwidth.In the interest to achieve radar application necessities,the proposed antenna is exploited to develop an antenna array which consists of four connected elements.Adding dielectric directors can significantly enhance the radiations characteristics of the antenna and reduce the mutual coupling inter-elements.So using four elements with dielectric director in the antenna array can achieve the same results obtained with eight elements without directors.This can decrease the used number of elements that form the antenna array. 展开更多
关键词 Dielectric director high permittivity antipodal Vivaldi antenna(AVA) ultra-wideband(UWB) antenna array
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Wide-Temperature-Range Dielectric Permittivity Measurement under High Pressure
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作者 Zhen Yuan Jin-Long Zhu +4 位作者 Shao-Min Feng Chang-Chun Wang Li-Juan Wang Qing-Qing Liu Chang-Qing Jin 《Chinese Physics Letters》 SCIE CAS CSCD 2017年第4期13-17,共5页
Two measurement systems are developed for in-situ dielectric property measurement under high pressure in a wide-temperature range from 77K to 1273 K. The high-temperature system ranging from room temperature up to 127... Two measurement systems are developed for in-situ dielectric property measurement under high pressure in a wide-temperature range from 77K to 1273 K. The high-temperature system ranging from room temperature up to 1273K is equipped with a hexahedron anvils press, while the low-temperature system ranging from liquid nitrogen temperature to normal condition is equipped using the piston cylinder setup with a specially designed sample chamber. Using these configurations, the dielectric property measurement of ferroelectrie BaTiO3 and multiferroie Tm0.5Gd0.5MnO3 compounds are demonstrated, which proves the validity of the systems through the tuning of the polarization and phase transition boundary by high pressure. These two systems will be equally applicable to a wide variety of electronic and transport property measurements of insulators, semiconductors, as well as battery materials. 展开更多
关键词 der Wide-Temperature-Range Dielectric permittivity Measurement under high Pressure BTO
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Ultra-low specific on-resistance vertical double-diffused metal-oxide semiconductor with a high-k dielectric-filled extended trench 被引量:1
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作者 王沛 罗小蓉 +11 位作者 蒋永恒 王琦 周坤 吴丽娟 王骁玮 蔡金勇 罗尹春 范叶 胡夏融 范远航 魏杰 张波 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第2期439-444,共6页
An ultra-low specific on-resistance trench gate vertical double-diffused metal-oxide semiconductor with a high-k dielectric-filled extended trench(HK TG VDMOS) is proposed in this paper.The HK TG VDMOS features a hi... An ultra-low specific on-resistance trench gate vertical double-diffused metal-oxide semiconductor with a high-k dielectric-filled extended trench(HK TG VDMOS) is proposed in this paper.The HK TG VDMOS features a high-k(HK) trench below the trench gate.Firstly,the extended HK trench not only causes an assistant depletion of the n-drift region,but also optimizes the electric field,which therefore reduces Ron,sp and increases the breakdown voltage(BV).Secondly,the extended HK trench weakens the sensitivity of BV to the n-drift doping concentration.Thirdly,compared with the superjunction(SJ) vertical double-diffused metal-oxide semiconductor(VDMOS),the new device is simplified in fabrication by etching and filling the extended trench.The HK TG VDMOS with BV = 172 V and Ron,sp = 0.85 mΩ·cm2 is obtained by simulation;its Ron,sp is reduced by 67% and 40% and its BV is increased by about 15% and 5%,in comparison with those of the conventional trench gate VDMOS(TG VDMOS) and conventional superjunction trench gate VDMOS(SJ TG CDMOS). 展开更多
关键词 high permittivity specific on-resistance breakdown voltage trench gate
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High Index SMES Device for Gravitomagnetic Field Generation
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作者 Gary V. Stephenson 《Journal of High Energy Physics, Gravitation and Cosmology》 2021年第2期367-376,共10页
A method is described for creating a measurable unbalanced gravitational acceleration using a gravitomagnetic field surrounding a superconducting toroid as described by Forward (1962). An experimental Superconducting ... A method is described for creating a measurable unbalanced gravitational acceleration using a gravitomagnetic field surrounding a superconducting toroid as described by Forward (1962). An experimental Superconducting Magnetic Energy Storage (SMES) toroid configuration of wound superconducting nanowire is proposed to create a measurable acceleration field along the axis of symmetry, providing experimental confirmation of the additive nature of a Lense-Thirring derived gravitomagnetic field. In the present paper, gravitational coupling enhancement of this effect is explored using a high index or high permittivity material, as predicted by Sarfatti (2020) using his modification to Einstein’s General Relativity Field Equations for gravitational coupling in matter. 展开更多
关键词 GRAVITATIONAL Gravitomagnetic Lense-Thirring Superconducting Magnetic Energy Storage SMES NANORODS NANOWIRES Super Dielectric Materials SDM Super Capacitors high permittivity Gravitomagnetic Permeability Gravitational Coupling
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High-permittivity Sb_(2)S_(3) single-crystal nanorods as a brand-new choice for electromagnetic wave absorption 被引量:2
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作者 Jing Qiao Xue Zhang +4 位作者 Chang Liu Zhou Wang Wei Liu Fenglong Wang Jiurong Liu 《Science China Materials》 SCIE EI CAS CSCD 2021年第7期1733-1741,共9页
The application of antimony sulfide(Sb_(2)S_(3))has been limited mainly to the energy storage and photoelectric conversion fields.However,in this work,the application of Sb_(2)S_(3) is extended to the field of electro... The application of antimony sulfide(Sb_(2)S_(3))has been limited mainly to the energy storage and photoelectric conversion fields.However,in this work,the application of Sb_(2)S_(3) is extended to the field of electromagnetic(EM)wave absorption for the first time.High-permittivity Sb_(2)S_(3) singlecrystal nanorods were prepared successfully and exhibited excellent performance,with a low reflection loss of -65.9 dB(13.0 GHz,3.8 mm)and an ultra-wide effective absorption bandwidth of 9.5 GHz(8.5-18.0 GHz,4.1 mm).After excluding the general absorption mechanisms,including conductive losses,interfacial polarization,and dipole polarization,the distinctive single-crystal volume polarization affected by shape anisotropy was proposed.This work not only meets the challenge of a single-component dielectric material design but also introduces a new concept for construction of efficient dielectric EM wave absorption material. 展开更多
关键词 antimony sulfide single-crystal nanorods high permittivity volume polarization electromagnetic wave absorption
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Greatly enhanced permittivity in BaTiO_(3)-epoxy dielectric composites with improved connectivity of ceramic phase 被引量:1
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作者 Meng Cao Lei Li +2 位作者 Wen Bin Hong Shu Ya Wu Xiang Ming Chen 《Journal of Materiomics》 SCIE EI 2021年第1期1-7,共7页
BaTiO_(3)-epoxy dielectric composites were prepared by curing the liquid epoxy monomer that infiltrated into the partially-sintered BaTiO_(3)porous ceramics.The BaTiO_(3)volume fraction of the composites maintained ar... BaTiO_(3)-epoxy dielectric composites were prepared by curing the liquid epoxy monomer that infiltrated into the partially-sintered BaTiO_(3)porous ceramics.The BaTiO_(3)volume fraction of the composites maintained around 58.6%with increasing the sintering temperature from 600℃to 1000°C,while the significant microstructure evolution,improved connectivity of BaTiO_(3)phase and dramatical increase in permittivity from 102 to 697 were observed.The permittivity and BaTiO_(3)volume fraction further increased to 2328 and 83.5%for the sintering temperature of 1250℃.The present composites had the permittivity 102 orders of magnitude higher than the 0-3 type ones,and the extraordinary results were mainly attributed to the improved connectivity of BaTiO_(3)phase that benefited from partial sintering.The connectivity also had a significant effect on the temperature dependence of permittivity,and good combination of temperature-stable high permittivity,low dielectric loss and relatively low ceramic fraction could be obtained by regulating the connectivity of BaTiO_(3)ceramic phase. 展开更多
关键词 Ceramic-polymer composite CONNECTIVITY high permittivity
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Microstructures and microwave dielectric properties of (Ba1-xSrx)4(Sm0.4Nd0.6)28/3Ti18O54 solid solutions 被引量:4
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作者 Xianpei HUANG Xinyu LIU +5 位作者 Fei LIU Changlai YUAN Jingjing QU Jiwen XU Changrong ZHOU Guohua CHEN 《Journal of Advanced Ceramics》 CSCD 2017年第1期50-58,共9页
(Bal-xSrx)4(Sm0.4Nd0.6)28/3Ti18O54 (x=0.02,0.04,0.06,0.08,0.1) solid solutions were prepared by the conventional solid-state reaction process.It was found that (Ba1-xSrx)4(Sm0.4Nd0.6)28/3 Ti18O54 ceramics are fully co... (Bal-xSrx)4(Sm0.4Nd0.6)28/3Ti18O54 (x=0.02,0.04,0.06,0.08,0.1) solid solutions were prepared by the conventional solid-state reaction process.It was found that (Ba1-xSrx)4(Sm0.4Nd0.6)28/3 Ti18O54 ceramics are fully composed of BaSm2Ti4O12 and BaNd2TisO14 phases for all the compositions.The increasing x value (0.02 ≤ x ≤ 0.1) in (Ba1-xSrx)4(Sm0.4Nd0.6)28/3Ti18O54 ceramics can not only obtain high Q ×f value but also effectively enhance the permittivity (εr).The (Ba1-xSrx)4(Sm0.4Nd0.6)28/3Ti18O54 ceramic with x=0.08,sintered at 1440 ℃ for 4 h,shows excellent microwave dielectric properties of permittivity (εr) ≈ 93.19,quality factor (Q × f) ≈ 9770.14 GHz (at 3.415 GHz),and almost near-zero temperature coefficient of resonant frequency (rf)≈ +4.56 ppm/℃. 展开更多
关键词 tungsten bronze type high permittivity microwave dielectric properties
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Effect of carbon-doping on structural and dielectric properties of zinc oxide
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作者 MD.Parvez Ahmad A.Venkateswara Rao +1 位作者 K.Suresh Babu G.Narsinga Rao 《Journal of Advanced Dielectrics》 CAS 2020年第4期61-67,共7页
In this paper,Carbon-doped Zinc Oxide(C-ZnO)samples were prepared using the solid-state reaction method.The influence of carbon-doping on the structural and dielectric properties of ZnO samples was studied.The shift i... In this paper,Carbon-doped Zinc Oxide(C-ZnO)samples were prepared using the solid-state reaction method.The influence of carbon-doping on the structural and dielectric properties of ZnO samples was studied.The shift in the highest peak position(101)in XRD patterns of carbon-doped samples was observed.The Raman peak at 581 cm^(-1) in undoped ZnO was shifted and broadened in carbon-doped ZnO samples.The ZnO samples doped with carbon show higher values of dielectric constant(~2400 at 1 kHz)compared to pure ZnO(~9 at 1 kHz)which was due to increase in native point defects in the samples.The ac conductivity(σ_(ac))value of the carbon-doped sample was enhanced by 103 times for((ZnO)_(0.9) C_(0.1))sample. 展开更多
关键词 Zinc oxide dielectric properties high dielectric permittivity AC conductivity
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