Materials Literature
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Polymer solar cells are a promising alternative to more traditional silicon solar cells. This is mainly due to the good solubility of organic semiconductors, which makes it possible to produce large-scale and mechanically flexible devices with roll-to-roll processes. To be able to fully utilise this promising techniqu…
Thin-film transistors (TFTs) with channel materials made out of hydrogenated amorphous silicon (a-Si:H) and polycrystalline silicon (poly-Si) have been extensively investigated. Amorphous silicon continues to dominate the large-format display technology; however newer technologies demand a higher performance TFT which…
The following dissertation addresses a novel low cost process developed to fabricate a Vertical Organic Field Effect Transistor (VOFET). The solution processable VOFET is designed, fabricated and tested in the context of bioengineering domains. The scope of distinct biomedical applications has also been explored.\nOrg…
In the present study mixed-conducting solid oxides with perovskite structure are investigated regarding their applicability as oxygen electrode (cathode) in solid oxide fuel cells based on proton-conducting electrolyte membranes. This type of high temperature fuel cells is a promising device as it may allow one to dec…
Liquid crystals (LCs), presently the basis of the dominant electronics display technology, also hold immense potential for the design of new self-assembling, self-healing, and "smart" responsive materials. Essential to many of these novel materials are liquid crystalline defects, places where the liquid crystalline or…
This thesis attempts to shed light on various spin-orbit driven transport phenomena in materials, as a crucial for the further development of the field of spintronics. In particular, we address the skew-scattering mechanism in dilute alloys, which gives rise to the anomalous and spin Hall effect, as well as spin-relax…
Der Einsatz von GJV in der automobilen Serienfertigung ist momentan aufgrund seiner schlechten Zerspanbarkeit hauptsachlich auf Fahrzeuge der Oberklasse und den Nutzfahrzeugsektor beschrankt. Zerspanende Operationen an Zylinderkurbelgehausen aus GJV, insbesondere kontinuierliche Prozesse wie das Zylinderbohren, sind d…
This thesis studied cadmium sulfide and cadmium selenide quantum dots and their performance as light absorbers in quantum dot-sensitised solar cells. This research has made contributions to the understanding of size dependent photodegradation, passivation and particle growth mechanism of cadmium sulfide quantum dots u…
Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.
The progress of our information society in this current era depends mostly on the improvement of the computing speed of microprocessors. Therefore semiconductor industries realize further developments in processor architecture but also in the patterning process which is utilized for the manufacturing of microprocessor…
Sedimenting suspensions exist in a varity of natural phenomena and industrial applications. It is already observed in experiments that the dilute fibre suspensions experience a concentration instability under gravity at low Reynolds numbers. Initially well-mixed suspensions become inhomogeneous and anisotropic due to…
The ageing mechanisms and long-term stability of different solar thermal absorber coatings were investigated at elevated temperatures of 200-500 °C. The absorbers were aged by means of thermal accelerated ageing studies and short-period heat treatments up to 500 °C for two hours.\n\nThe solar absorbers studied were va…
The irradiation of tetrahedral amorphous carbon (ta-C) with swift heavy ions leads to the formation of conductive microscopic ion tracks with diameters of about 10 nm. This phenomena depends on the sp² to sp³ hybridization-ratio of the amorphous carbon structure. The energy deposition of the impinging ion induces a ma…
In this work, the use of modified diamond as an electrode material with superlative physical and electrochemical properties was investigated in a number of electrochemical applications. The surface chemistry of three differing forms of diamond, namely boron-doped microcrystalline diamond, boron-doped diamond powder an…
During the past decade significant attention has been focused on study of organic solar cells, representing a promising technology for renewable environmental-friendly energy. In comparison to the inorganic counterparts, the organic photovoltaic devices posses a number of important advantages, however, their applicati…
Fuel cell technology has many promising characteristics which make it an attractive prospect for an environmentally friendly energy conversion device. Some of the benefits of using these devices include high efficiencies, diversity in applicability and scalability, high energy densities, and the ability to use a wide…
Ce travail de thèse a permis le développement de composites conducteurs d'électricité pour des applications aéronautiques. La matrice Poly (Ether Ether Ketone) PEEK non miscible dans les solvants organiques communs à température ambiante entraine une mise en œuvre à l'état fondue. La dispersion de nanotubes de carbone…
The second and fourth generations of hydroxylated dendritic polyesters (HBP2, HBP4) were combined with unmodified sodium montmorillonite clay (Na+MMT) in water to generate a broad range of polymer clay nanocomposites from 0 to 100% wt/wt Na+MMT. X-ray diffraction (XRD) and transmission electron microscopy (TEM) were u…
Ces travaux de these ont pour objectif l'elaboration de membranes thermostables conductrices de protons destinees aux piles a combustible. En effet, les performances de la membrane Nafion®, reference des PEMFCs (Proton Exchange Membrane Fuel Cell) sont limitees aux basses temperatures, ceci en raison d'une perte de co…
Fluid interfaces in contact with solid substrates play an important role in fields ranging from microfluidics, over oil recovery and inkjet printing to coating processes. Effective models for the static wetting of structured substrates exist, as models for the dynamics of a fluid interface moving over a molecularly un…