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 16 of 16 for “"high permittivity"”.
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Experimental investigation of carrier mobility degradation in metal oxide semiconductor field effect transistors of high permittivity gate dielectrics
… aggressive scaling gives rise, among others, to high gate tunnelling currents in contemporary silicon dioxide (SiO2) based Metal-Oxide- Field Effect Transistors (MOSFETs). SiO2 is therefore expected to be replaced in future technologies with alternative dielectrics. Several dielectrics with high …
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Low filler volume concentration composite dielectrics
"One avenue for synthesizing a high energy density capacitor while circumventing the manufacturing problems and low breakdown strength associated with dense, sintered ceramics, is to incorporate low volume concentrations of well dispersed high permittivity filler, such as barium titanate, in …
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Modeling and simulations of diphasic composites for development of high energy density dielectrics
… is focused on diphasic dielectric composites for high energy density storage applications in pulsed power and power distribution systems. Composite materials are particularly attractive because they can synergistically combine high permittivity with high breakdown strength of the individual …
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Thin-film trench capacitors for silicon and organic packages
The continuous trend towards mega-functional, high-performance and ultra-miniaturized system has been driving the need for advances in novel materials with superior properties leading to thin components, high-density interconnect substrates and interconnections. Power supply and management is …
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3D PRINTING OF ELASTOMERS AND APPLICATIONS
… demand for the soft functional polymers is very high in our nowadays soft electronics applications. These applications are like flexible touch screens, electronic skins, and energy storage, just to name few. To manufacture these functional polymers by traditional ways to fit in these …
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Directed Colloidal Assembly and Characterization of PZT -Polymer Composites
… (∼1 mm). Lattice rod intersections formed high permittivity, low compliance PZT pillars that concentrated stress and electric flux, leading to improved hydrostatic figures of merit.
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Soft nanocomposites with enhanced electromechanical response for dielectric elastomer actuators
… field induced electrostatic pressure. The high operating voltage of such devices is currently a large drawback, hindering their use in applications such as biomedical devices and biomimetic robots, however, they could be improved with a careful design of their material properties. The main …
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Dielectric elastomer composites: analytical and numerical non-convex homogenization methods and applications
… examine dielectric elastomers filled with stiff high-permittivity particles, high-permittivity particles that are liquid-like in mechanical behavior, and vacuous pores. In addition to generalizing the fundamental purely elastic and purely dielectric solutions of Eshelby and Maxwell to the coupled …
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Non-invasive electromagnetic wave sensor for flow measurement and biphase application
… occur inside a cavity and the differences in the permittivity of the measures phases. By measuring this response over the range of discrete frequencies the sample can be characterised. Polar material like water has relatively high permittivity (ε_r= 81), while non-polar material such as oil and …
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Instability of Dielectric Elastomer Actuators
… design and realization of electrically-driven, highly deformable actuators and devices, which find application in several fields of technology and engineering, including aerospace, biomedical and mechanical engineering. Subject to a voltage, a membrane of a soft dielectric elastomer coated by …
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Exploiting Near Field and Surface Wave Propagation for Implanted Devices
… modulation provides a low-power, high-bandwidth alternative to conventional low frequency inductive coupling. A prototype active implantable device presented in this thesis is capable of transmitting data at 30 Mbps over a 915 MHz link while immersed in saline, at a communication …
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Multi-scale modelling of atomic layer deposition
High-permittivity ("high-k") dielectric materials are used in the transistor gate stack in integrated circuits. As the thickness of silicon oxide dielectric reduces below 2 nm with continued downscaling, the leakage current because of tunnelling increases, leading to high power consumption and …
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Critical analysis of a practical fourth order finite-difference time-domain algorithm for the solution of Maxwell's equations
… finite-difference time-domain (FDTD) method is a highly effective numerical method of solvingMaxwell's equations in the time domain. Traditionally the approximation of the derivatives in Maxwell's equations is based on a central differencing scheme which is second order accurate (second order). …
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MEMS Hybrid Electronic Integration: From Micro-Robotic Actuation to Control and Monitoring of MEMS Sensor
… systems. The first investigated the use of high-permittivity (high-k) dielectrics to strengthen electrode fields and potentially reduce operating voltages for FP MicroStressBots. The second explored the fabrication of electrostatic devices by sputter-coating 2PP 3D-printed structures with …
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Dielectric materials by Atomic Layer Deposition for microelectronic applications
… and manufacturing techniques in order to achieve high performance and reliability. According to the miniaturization at the nanometric scale, the need of deposition methods with atomic level accuracy has become an important issue. In this perspective, the ALD is the most promising deposition …