Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 46 for “"high electric field"”.
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Metal-Aluminum Oxide Interactions: Effects of Surface Hydroxylation and High Electric Field
… by the presence of interfacial impurities and/or high electric fields that may change the thermodynamic and kinetic behaviors of the metal/oxide interfaces. This research includes: (1) the surface hydroxylation effects on the aluminum oxide interactions with copper adlayers, and (2) effects of …
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DC, RF, and Thermal Characterization of High Electric Field Induced Degradation Mechanisms in GaN-on-Si High Electron Mobility Transistors
<p>Gallium Nitride (GaN) high electron mobility transistors (HEMTs) are becoming increasingly popular in power amplifier systems as an alternative to bulkier vacuum tube technologies. GaN offers advantages over other III-V semiconductor heterostructures such as a large bandgap energy, a low …
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On the relationship between carrier mobility and velocity in sub-50 mm MOSFETs via calibrated Monte Carlo simulation
… The relationship between electron mobility and high-electric-field velocity at the source-channel potential energy barrier was investigated. The results show a strong correlation, as was demonstrated previously experimentally. Moreover, further proof is provided that the velocity at which …
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Nano- and Micro-Second Electrical Pulsing of B16-F10 Mouse Melanoma Cells: Plasma Membrane and Sub-Cellular Organelle Changes
<p>High electric field-treated cells are permeable to molecular dye through either opening of pores in the plasma membrane or other unknown processes which can disturb the membrane in an organized way. However, direct morphological evidence is lacking and responses of intracellular organelles are …
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Technology for Planar Power Semiconductor Devices Package with Improved Voltage Rating
The high-voltage SiC power semiconductor devices have been developed in recent years. They cause an urgent in the need for the power semiconductor packaging to have not only low interconnect resistance, less noise, less parasitic oscillations, improved reliability, and better thermal management, …
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Nonlinear Electrokinetic Flow near Permselective Membrane
… It was demonstrated that, under a significantly high electric field, an electroconvective instability occurs near the membrane surface. In quiescent electrolyte, the instability induces strong paired vortices. These vortices transport more ions to the membrane to promote an overlimiting current. …
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Modulation-Doped Field-Effect Transistors for High-Power Microwave Applications
… and sequential wet and dry selective etching. A high linearity of device characteristics is important to minimize intermodulation of high frequency signals under high-power operation. The linearity of device performance is investigated through the comparison of InGaAs/GaAs PHEMTs and doped …
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Time dependent dielectric breakdown in novel GaN metal-insulator-semiconductor high electron mobility transistors
… our households and step into mainstream electric vehicles. Recently, GaN metal-insulator-semiconductor high electron mobility transistors (MIS-HEMTs) have been increasing in popularity for high voltage power electronics applications because they combine high electron mobility with low …
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ENHANCEMENT OF CONVECTIVE HEAT TRANSFER IN INTERNAL FLOWS USING AN ELECTRICALLY-INDUCED CORONA JET
… by corona discharge and ion-driven flows. When a high electric potential is applied to a conductor, a high electric field will be generated. The high electric field may exceed the partial break-down of the neutral molecules of surrounding gas (air) and generate a low-temperature plasma in the …
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Counter-flow Ion Mobility Analysis: Design, Instrumentation, and Characterization
The quest to achieve high resolution in ion mobility spectrometry (IMS) has continued to challenge scientist and engineers in the field of separation science. The low resolution presently attainable in IMS has continued to negatively impact its utility and acceptance. Until now, efforts to improve …
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Bayesian Optimization of PCB-Embedded Electric-Field Grading Geometries for a 10 kV SiC MOSFET Power Module
… optimization technique is used to design electric field grading structures in a PCB-integrated bus bar for a 10 kV bondwire-less silicon-carbide (SiC) MOSFET power module. Due to the ultra-high-density of the power module, careful design of field-grading structures inside the bus bar is …
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Double-Side Cooled 3.3 kV, 100 A SiC MOSFET Phase-Leg Modules for Traction Applications
… W/cm² under a typical water-cooling condition. Electric field simulations identified high electric field stress at the module's outer surface edges exposed to air, posing a risk for partial discharge. To mitigate this risk, a solution that involves covering the critical point in an epoxy was …
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Focal waveform of a prolate-spheroidal impulse radiating antenna (IRA)
… pulses in a narrow beam with low dispersion and high field amplitude. For this reason they have been used in a variety of applications. IRAs have been developed for the transient far-field region using paraboloidal reflectors. However, in this dissertation we focus on the near field region and …
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Development of Small-Pitch, Thin 3D Sensors for Pixel Detector Upgrades at HL-LHC
… depletion voltage requirement, inter-columnar high electric field distribution, lower trapping probability, faster charge collection capability, lower power dissipation, and lower inter-pitch charge sharing. Since several years, FBK has developed 3D sensors with a double-sided technology, that …
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Fabrication and applications of zinc indiffused waveguides in periodically poled lithium niobate
A comprehensive investigation of high conversion efficiency second harmonic generation (SHG) devices based on zinc indiffused channel waveguides in periodically poled lithium niobate (PPLN) is reported in this thesis. The thesis covers all stages from the production of PPLN by domain inversion on a …
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Characterization of a piezoelectric transformer plasma source
The piezoelectric transformer plasma source (PTPS) is a compact RF driven plasma source developed for near-space and microspacecraft propulsion. The PTPS uses the mass transfer of emitted charged particles from the plasma to produce thrust. The PTPS utilizes the piezoelectric transformer effect to …
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Impulse electrical breakdown of high-purity water
Experiments have been conducted on the electrical breakdown of high-purity water and water mixtures. The electrical regime of interest has been carefully defined and documented to consist of electrical impulses with approximately microsecond rise time and fall time greater than 65 microseconds, on …
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Model Validation and Inversion of Active Implantable Medical Devices
… the tangential components of the incident fields along validation pathways should be orthogonal to each other or at least has low correlations between each other. These guidelines can be implemented for future AIMD model validations in ISO 10974. Based on the transmission line model, the …
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Alternative gate dielectrics and application in nanocrystal memory
… (Ge) nanocrystal memory structures, employing high dielectric constant (high-k) materials to replace the tunnel oxide and capping oxide (control oxide) layers, was investigated. It was found that faster charging rate and better charge retention performance could be obtained with a high-k tunnel …
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Kerr electro-optic measurements for electric field and space charge distributions using similar and dissimilar electrode pairs
The electrical breakdown strength of insulating materials is a major limiting factor of reliability in electric power, medical devices, and other high electric field applications. Electrical breakdown strength increase results in increased reliability and energy storage in high voltage capacitors …
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