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 48 for “"Kelvin probe"”.
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The application of the Kelvin probe in materials science.
This thesis reports on the application of the Kelvin probe in materials science and in particular on the study of metal and semiconductor surfaces in both ambient and UHV environments. The concept of the work function φ and its importance as a parameter in materials science is discussed in the …
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Study of semiconductor and metal surfaces using a novel scanning Kelvin probe.
… design and construction of a novel Scanning Kelvin probe (SKP) compatible with the Ultra-High-Vacuum (UHV) environment - the first automatic, high resolution, UHV-SKP in the UK. The Kelvin Probe is a capacitor device used to measure the work function phi between a vibrating reference …
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Development and application of the scanning Kelvin probe for solar cell defect analysis.
The Kelvin probe is a non-contact, non invasive capacitor device capable of detecting changes in local work function and surface state and has become a valuable tool for surface science research. This thesis presents three years of work centred on the development and novel applications of the …
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Kelvin Probe Force Microscopy on Graphene Thin Films for Solar Cell and Biosensing Applications
… of open circuit voltage was investigated using Kelvin Probe Force Microscopy (KPFM) in the dark and under light irradiation. In our study, we have also demonstrated the fabrication of photovoltaic devices from cost-effective, water-soluble, and bio-sensitive acridine orange molecules. We …
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Investigation of Surface States and Device Surface Charging in Nitride Materials Using Scanning Kelvin Probe Microscopy
In this work Scanning Kelvin Probe Microscopy (SKPM) was used to characterize surface states and device surface charging in nitride materials. Samples grown by Molecular Beam Epitaxy (MBE), Metal Organic Chemical Vapor Deposition (MOCVD) and Hydride Vapor Phase Epitaxy (HVPE) typically show a high …
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Application of scanning micro-tip and UHV Kelvin probes in surface and material characterisation.
… thesis we present work utilising the scanning Kelvin probe (SKP) for surface potential mapping and monitoring changes in work function due to environmental influences in ambient and UHV conditions. The SKP is a truly non-contact technique which determines local work function changes and surface …
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Probing charge motion in next-generation semiconductors with scanned probe microscopy
Scanned probe microscopy has allowed researchers to explore spatial variations in charge generation and transport in solar-cell films prepared on a conductive substrate with a best-case resolution of 2 nanometers. In this thesis, we introduce new scanned probe measurements to measure light- and …
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Vibrating CPD Chemical Degradation Oil Sensor
… for monitoring oil degradation with a vibrating Kelvin probe technique. The Vibrating Kelvin probe method for measuring the work function of metals has been used since 1932. Among the applications of this technique are adsorption, corrosion, friction and other studies. A novel application of this …
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Effect of iron content on electrodeposited Fe-MnOx catalysts for water oxidation
… Fe in the structure. The catalyst structure was probed using XPS for elemental analysis, FESEM to study the morphology, and a Kelvin probe for exploration of the work function, and observations are discussed.
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Kraftmikroskopische Untersuchungen dünner ferroelektrischer Filme
… microscopy - specifically Piezoresponse and Kelvin-Probe. The film thickness of the investigated samples ranged between 50nm and 800nm. This experimental work focussed on the following issues: native domain structures, creation of domains by short voltage pulses and area-switching with the …
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Terahertz imaging arrays for room temperature operation summary of doctoral thesis /
… created. Detailed electrical characterization by Kelvin probe force, scanning tunneling microscopy measurements, Synapsys TCAD and FDTD simulations were performed. These results let to supplement the principle of detection mechanism by field-effect caused by surface charge. InGaAs bow-tie detector …
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Local Charging Behavior on GaN Surfaces
… by measuring the surface potential with scanning Kelvin probe microscopy (SKPM). The charging and discharging behavior of the surface appears to be strongly influenced by surface preparation and the presence of a surface oxide layer. If a substantial oxide layer exists, then both positive and …
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Laser direct written silicon nanowires for electronic and sensing applications
… between dopant levels are measured using Kelvin probe force microscopy.</p>
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Study and analysis of surface charge collection and emission spectrum of plasma ashing process
… voltage (Vs) on wafer surface with contactless Kelvin Probe for changes in parameters during plasma ashing. In this report, it is covered on the plasma characteristics and performance using the optical emission spectroscopy (OES) measurement, the study on how processing condition change can …
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Two-Dimensional Titanium Carbide MXene for Lithium-ion Conductive Solid-state Electrolytes
… spectroscopy, atomic force microscopy (AFM), and Kelvin probe force microscopy (KPFM) to evaluate its structural and morphological properties. To explore the potential of 2D Ti3C2Tx MXene in SPEs, the MXene were integrated into three different polymer matrices and the resulting SPEs were evaluated …
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Probing complex ionic dynamics on the nanoscale via energy discovery platforms
… Multiple in-situ techniques, i.e. time-resolved Kelvin probe force microscopy and electrochemical impedance spectroscopy, were performed on the same sample to cover a full range of ionic response. Structural and compositional analysis were performed via a variety of techniques including atomic …
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Charged ferroelectric domain walls: the next generation in 2D functional materials
… potential mapping techniques in AFM such as Kelvin probe force microscopy (KPFM) to spatially map the Hall potential on the nanoscale. This allowed the behaviour of the wall to be established independently of the influence of the surrounding domain and the contact resistances at …
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Scanning probe microscopy study of thin film solar cells
… solar cells have been studied by using scanning probe microscopy based techniques. The scanning spreading resistance microscopy (SSRM) has been developed on the cross-section of CdTe solar cells to study the resistance and carrier concentration distribution in different layers of the device. The …
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