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 “"current leakage."”.
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A Study on the Nature of Anomalous Current Conduction in Gallium Nitride
Current leakage in GaN thin films limits reliable device fabrication. A variety of Ga and N rich MBE GaN thin films grown by Rf, NH3, and Rf+ NH3, are examined with electrical measurements on NiIAu Schottky diodes and CAFM. Current-voltage (IV) mechanisms will identify conduction mechanisms on …
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CAFM Studies of Epitaxial Lateral Overgrowth GaN Films
… In particular, these defect sites demonstrate current leakage under reverse-bias conditions that are detrimental to device fabrication. Two growth techniques that were used to improve this leakage behavior for samples in this study included: epitaxial lateral overgrowth (ELO) and nano-ELO using …
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Reducing Off-State Current in P-Type Metal Oxide Thin Film Transistors
… be fabricated cheaply, in large areas, using the current electronics infrastructure. Some devices are already being produced in industry; however, they typically rely on an NMOS device architecture, which is inferior to CMOS. While NMOS is a type of digital circuit design which utilises only …
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Surface functionalization of graphene devices
… lack of a bandgap results in a high off-state current leakage and a nonsaturating drive current, both of which severely limit graphene's practical applications in electronic devices. Chemical functionalization on its surface promises a powerful tool to manipulate its electronic properties and …
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Artificial Intelligence-Aided Synthesis and Characterization of 2D Materials
… for Si, significant scattering in the channel, current leakage and performance degradation will prevent further device scaling down. To address this challenge, two-dimensional (2D) materials have emerged as promising candidates for next-generation transistors, to maintain the pace of Moore's …
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Can the phased array stimulation strategy be implemented using the advanced bionics cochlear implant?
… whether it provides better speech reception than currently available systems. This thesis investigates whether the phased array strategy can be implemented using the Advanced Bionics Clarion CH or HiRes90k cochlear implant. It is shown that for realistic cochlear implant electrode impedance …
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Mechanical design and analysis of implantable components for a retinal prosthesis
… polymers is a potential alternative. Our current prosthesis design requires both a polyimide electrode array and a return wire to penetrate the protective capsule. Therefore, a technique for evaluating the hermetic encapsulation of these components was designed and tested. Simple, …
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Redox-active materials for electrochemically-mediated separations
… able to reduce the extent of anode fouling and current leakage by preventing parasitic water reduction, offer optimizable separation energies based on solution conditions as well as the selected anode-cathode couple, allow for the enhanced and simultaneous recovery of transition and alkali metal …
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Theory and optimisation of metamorphic photonic devices
… the use of an InGaAs MBL, bringing a reduced current leakage from the active region. After performing a detailed analysis over a series of metamorphic lasers and LEDs, which include such nanostructures in the active region as quantum wells, dots and wires, we identify the trends in electronic …
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Mid-infrared antimonide based type II quantum dot lasers for use in gas sensing
… temperature range. To compensate the thermal leakage problem, the QDs integrated on InP substrates were grown between InGaAs barriers, which can provide a larger valence band offset compared with InAs. The QD PL peak moved to shorter wavelength (~2.7 μm) partly due to the stronger confinement, …
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First-Principles Study of Band Alignment and Electronic Structure at Metal/Oxide Interfaces: An Investigation of Dielectric Breakdown
… of the device size exponentially increases the leakage current density, which also raises the risk of dielectric breakdown. It has been proposed that point defects, current leakages, impurity diffusions, etc. all contribute to the change of oxide chemical composition and ultimately lead to the …
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Dopant Incorporation in InAs/GaAs Quantum Dot Infrared Photodetectors
… due to selection rules. However, excessive dark current density, which causes QDIPs to underperform theoretical predictions, is a limiting factor for the advancement of QDIP technologies. The purpose of this dissertation research is to achieve a better understanding of dopant incorporation into …
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Single channel studies on the modulation of connexin hemichannels by Cx43 targeting peptides and cytoplasmic Ca2+ in the context of heart disease
… allows unequivocal identification of hemichannel currents by their single channel conductance that is typically ~220 pS for Cx43. In HeLa cells stably transfected with Cx43 (HeLa-Cx43), Gap26/27 peptides inhibited Cx43 hemichannels unitary currents over minutes at concentrations in the 100-200 μM …
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On-line condition monitoring and detection of stator and rotor faults in induction motors.
… using three types of sensor signals (i.e. current, leakage flux, and vibration) under different loading conditions. The work is based on an extensive series of sensor measurements taken using a number of nominally identical healthy machines (2.2 kW) and custom-modified machines (2.2 kW) …
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Assessment and Analysis of Commercial Off the Shelf Devices for Space Applications
… mechanisms, such as over-voltage, over-current, and thermal safeguards, which ensure system resilience in extreme environments. Similarly, optocouplers are indispensable in space missions, providing electrical isolation between high-voltage and low-voltage circuits to protect sensitive …
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Induction motor fault recognition.
… machine parameters such as vibration, line current and leakage flux which alter during machine faults. Initially a survey was conducted to determine which machine failures were of concern to industrial operators. Faults analysed in this thesis include rotor bar faults, unbalanced supply, …