Browsing Department of Physics and Astronomy by Author "Knoesen, Dirk"
Now showing items 1-13 of 13
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Aluminium induced crystallization of hydrogenated amorphous silicon thin films
Kotsedi, Lebogang (University of the Western Cape, 2005)This study was carried out to crystallize hydrogenated amorphous silicon (a-Si:H) thin films using the aluminium induced crystallization (AIC) technique. This was done to investigate whether is there any lateral crystallization ... -
Determination of the gas-flow patterns inside the hot-wire chemical vapor deposition system, using computational fluids dynamics software (fluent)
Wittes, Thobeka (University of the Western Cape, 2009)Computational Fluid Dynamics is the analysis of a system involving fluid flow, heat transfer and associated phenomena such as chemical reactions by means of a computer-based simulation. The simulations in this study are ... -
The effects of reverse bias on the efficiency of dye solar cells
le Roux, Lukas Johannes (University of the Western Cape, 2009)Dye-sensitised solar cells (DSC) have attracted much attention during the last few years due to their high efficiencies and their potentially low production costs. The technology is based on a thin layer of nano sized, ... -
Fabrication and characterization of a solar cell using an aluminium p-doped layer in the hot-wire chemical vapour deposition process
Lebogang, Kotsedi (2010)When the amorphous silicon (a-Si) dangling bonds are bonded to hydrogen the concentration of the dangling bond is decreased. The resulting film is called hydrogenated amorphous silicon (a-Si:H). The reduction in the dangling ... -
Fabrication and characterization of a solar cell using an aluminium p-doped layer in the hot-wire chemical vapour deposition process
Kotsedi, Lebogang (University of the Western Cape, 2010)When the amorphous silicon (a-Si) dangling bonds are bonded to hydrogen the concentration of the dangling bond is decreased. The resulting film is called hydrogenated amorphous silicon (a-Si:H). The reduction in the dangling ... -
Filament carburization during the hot-wire chemical vapour deposition of carbon nanotubes
Oliphant, Clive Justin (University of the Western Cape, 2008)This study reports on the changes in the structural properties of a tungsten-filament when exposed to a methane / hydrogen ambient for different durations at various filament-temperatures. -
Manufacturing of synthetic soda ash
Madima, Takalani (University of the Western Cape, 2009)The aim of the project was to study the manufacturing of synthetic soda ash (sodium carbonate, Na2CO3) on an industrial scale. Currently all Soda ash that is used in South Africa for manufacturing glass is imported at a ... -
Optical emission spectroscopy of laser induced plasmas containing carbon and transitional metals
Motaung, David Edmond (University of the Western Cape, 2008)The spectroscopic, SEM and Raman measurements on carbon nanotubes under the exact conditions of which OES analysis were made showed that at a pressure of 400 Torr and a flow rate of 200 sccm, the quality and quantity of ... -
Optical modeling of amorphous and metal induced crystallized silicon with an effective medium approximation
Muller, Theophillus Frederic George (University of the Western Cape, 2009)In this thesis we report on the metal-mediated-thermally induced changes of the structural and optical properties of hydrogenated amorphous silicon deposited by hot-wire CVD, where aluminium and nickel were used to induce ... -
A study of hydrogenated nanocrystalline silicon thin films deposited by hot-wire chemical vapour deposition (HWCVD)
Halindintwali, Sylvain (University of the Western Cape, 2005)In this thesis, intrinsic hydrogenated nanocrystalline silicon thin films for solar cells application have been deposited by means of the hot – wire chemical vapour deposition (HWCVD) technique and have been characterised ... -
Three dimensional thermal modelling of high temperature proton exchange membrane fuel cells in a serpentine design
Maasdorp, Lynndle Caroline (University of the Western Cape, 2010)The aim of my work is to model a segment of a unit cell of a fuel cell stack using numerical methods which is classified as computational fluid dynamics and implementing the work in a commercial computational fluid dynamics ... -
Towards stimuli-responsive functional nanocomposites: smart tunable plasmonic nanostructures Au-VO2
Kana, Jean Bosco Kana (University of the Western Cape, 2010)The fascinating optical properties of metallic nanostructures, dominated by collective oscillations of free electrons known as plasmons, open new opportunities for the development of devices fabrication based on noble metal ... -
The use of FLUENT for heat flow studies of the hot-wire chemical vapor deposition system to determine the temperatures reached at the growing layer surface
Zhou, En (University of the Western Cape, 2009)The overall aim of this project is to study the heat transfer inside the reaction chamber of the Hot-Wire Chemical Vapor Deposition (HWCVD) system with a commercial software package FLUENT6.3; it is one of the most popular ...