Dokumente Fakultät für Physik (inkl. GAUSS) nach Gutachter "Hofsäss, Hans Christian Prof. Dr."
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A Dedicated Endstation for Waveguide-based X-Ray Imaging
(2012-08-30)X-ray microscopy has emerged as a powerful and versatile imaging technique in many fields of science over the last years, offering insights in opaque media at high spatial resolution. A major challenge remains the ... -
A novel approach of immittance-spectra analysis and how it resolves a decade-old deviation of the Frenkel-Poole model
(2017-02-23)Immittance (i.e. a generalisation of all quantities containing identical information as e.g. the impedance) spectroscopy is a well-established and versatile method with a broad range of applications in a wide variety of ... -
Advanced x-ray multilayer waveguide optics
(2017-09-12)The aim of this thesis is to demonstrate that x-ray waveguide optics can be gen- eralized from a single guiding film to an array of planar waveguides, enabling more complex and controllable phenomena of field propagation ... -
Analyse der Glättung rauer Oberflächen durch Dünnschichtdeposition
(2009-08-17)In this dissertation it is investigated if and to what extent it is possible to smooth a rough surface by deposition of a thin film. The theory of roughening and smoothing due to growth ... -
Characterization of the electronic properties of LaIrIn5: calculations, transport-, heat capacity- and de Haas-van Alphen-experiments
(2007-02-26)The system LaIrIn5 constitutes the reference model for the 115-class of rare-earth intermetallic compounds. Some of them are heavy-fermion systems showing, besides superconductivity and magnetism, anomalous conduction ... -
Concentrations and Reactions of Iron in Crystalline Silicon after Aluminum Gettering
(2012-03-06)The purity of silicon starting materials and its contamination by several metal impurities are considered to be the major concern in silicon photovoltaics. Minute concentrations of impurities ... -
Controlled delamination of metal films by hydrogen loading
(2009-01-28)In this work we quantitatively determine the adhesion energy between metal films and their substrates. Therefore a new controlled buckling technique is established, applying the strong ... -
Critical thicknesses in Nb-H thin films: coherent and incoherent phase transitions, change of precipitation and growth modes and ultrahigh mechanical stress
(2016-08-03)For nanoscale systems such as Me-H thin films, changes of physical properties have been suggested to appear below certain critical sizes. The probable existence of these critical sizes and the related changes of thermodynamical ... -
Defect reaction paths of nickel in float zone silicon controlled by non-equilibrium vacancies
(2020-02-06)This thesis investigates how defect reaction paths of nickel in float zone silicon can be controlled by non-equilibrium vacancy concentrations. Three different aspects have been studied in detail. The temperature-dependent ... -
Development of InGaN/GaN nanostructures
(2017-02-06)In this work, the mechanisms regulating the selective area growth (SAG) of GaN-based nanostructures have been investigated, under different growth conditions, with the aim of improving the control over the growth of InGaN/GaN ... -
Dünne Palladium-Wasserstoff-Schichten als Modellsystem: Thermodynamik struktureller Phasenübergänge unter elastischen und mikrostrukturellen Zwangsbedingungen
(2015-07-07)Using the formation of a hydride phase in palladium-hydrogen thin films with 5 nm to 2000 nm thickness as a model, this work investigates the impact of film thickness as well as microstructural and elastic constraints on ... -
Elastic and viscoelastic deformation of glass plates by excimer laser induced stresses and patterned silicon suboxide films
(2021-10-28)A mechanically stressed film can cause a bending of the underlying substrate. Usually, the substrate deforms elastically, but in special cases a plastic or viscous deformation can be observed. Such deformations are mostly ... -
Electronic and Magnetic Properties of the Fe/GaAs(110) Interface
(2016-02-29)Metal-semiconductor interfaces are present in every semiconductor device and are therefore of fundamental importance in modern technology. In this thesis we investigate the structural, electronic, and magnetic properties ... -
Experimental study of lipid membranes: lipid domain formation and peptide aggregation.
(2006-06-22)In the presented work we have attemptted to improve our understanding of the factors which lead to the formation of lipid membrane spatial heterogeneities, caused by mixtures of different lipids and/or transmembrane peptides. ... -
From Slow to Ultra-fast MAS: Structural Determination of Type-Three Secretion System Bacterial Needles and Inorganic Materials by Solid-State NMR
(2014-12-16)This work on solid-state NMR methodologies and applications is divided in three parts. In the first part, three methods for solid-state NMR at ultra-fast Magic-Angle Spinning (MAS) are introduced: completely low-power ... -
Graphen auf Siliziumcarbid: elektronische Eigenschaften und Ladungstransport
(2014-06-10)In this thesis the local electronic as well as charge transport properties down to atomic length scales of epitaxial graphene on the SiC(0001) surface are investigated. To achieve this, next to well known scanning probe ... -
Growth and Characterization of Carbon-Metal-Nanocomposite-Thin-Films and Self-Organized Layer Growth
(2009-06-09)The simultaneous deposition of carbon and metal ions by mass-selected ion beam deposition leads to the formation of carbon-metal-nanocomposites. The morphology of the resulting films depends ... -
Herstellung und Charakterisierung metallorganisch deponierter Pufferschichten für YBa2Cu3O7
(2004-01-09)In this work the growth of buffer layers for the high temperature superconductor YBa2Cu3O7 by metal-organic-deposition (MOD) is investigated. Texture formation in CeO2-, Gd-doped CeO2 (CGO)- ... -
Hydrogen diffusion and hydride formation in grain boundary rich magnesium
(2019-05-06)In the last decade Magnesium (Mg) has attracted much interest as a storage material for hydrogen in a future hydrogen energy based economy. The reasons are its high reversible hydrogen capacity of up to 7,6 wt% and its ... -
Hydrogen in V-Fe thin films and Fe/V-Fe multi-layered thin films
(2011-11-25)In this thesis, hydrogen induced biaxial stress and local distribution of hydrogen in V-Fe films and V-Fe/Fe multi-layered films were investigated. The stress development and stress relaxation ...