Dokumente Fakultät für Physik (inkl. GAUSS) nach Gutachter "Hofsäss, Hans Christian Prof. Dr."
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In situ studies on palladium/rutile titanium dioxide exposed to low pressure hydrogen gas environments
(2018-11-12)The interaction of hydrogen gas with the palladium/rutile titanium dioxide model system was investigated with strong focus on the interface and its vicinity. Palladium (Pd) films were deposited on pretreated rutile titanium ... -
Investigation of laser-induced structures on metal surfaces produced via two-beam and laser-plasmon interference
(2023-03-15)Periodic surface structures can change the properties of material surfaces. The obtained various functionalities strongly depend on the type of the specific structures. This work deals with the generation of periodic ... -
Investigation of the Influence of Correlations on Photovoltaic Energy Conversion in Hot Polaron Solar Cells
(2022-08-08)In semiconductor single junction solar cells fundamental limitations are given by the two major intrinsic loss mechanisms: a) inability to absorb photons with energies below the band and b) thermalization of photon energies ... -
Investigation of the segregation behaviour in nanocrystalline materials
(2010-03-04)The ability to chemically identify single atoms in combination with 3D reconstruction of these atoms is the unique characteristic of atom probe tomography (APT). Hence, it has been applied ... -
Ionenstrahlinduzierte selbst-organisierte Musterbildung auf einfachen Oberflächen Theorie und Experiment
(2018-05-30)In the thesis at hand, ripple pattern formation on amorphous carbon and Si surfaces has been investigated at room temperature during low energy Ne and Ar ion irradiation as a function of the ion incidence angle. Monte ... -
Ionenstrahlunterstütztes Wachstum von Zinn-dotierten Indiumoxid-Filmen
(2004-05-24)In this work the optical, electrical and microstructural properties of tin-doped indium oxide (ITO) thin films deposited by ion beam assisted deposition (IBAD) were investigated. One aim ... -
Korngrenzsegregation in Silber-Nickel und Kupfer-Wismut Legierungen
(2005-09-30)The objective of this study is the characterization of the grain boundary segregation in Ag-Ni and Cu-Bi alloys by means of tomographic atom probe (TAP) and other high resolution characterizing ... -
Lanthanide Doped Wide Band Gap Semiconductors: Intra-4f Luminescence and Lattice Location Studies
(2004-03-03)The doping of semiconductors with lanthanides is a promising way to realize light emitters, their luminescence arising from radiative electron transitions within the 4f shell of the triply ... -
Lichtinduzierte magnetische Defekte in ultradünnen Filmen
(2018-02-09)Topological defects such as domain walls, vortices or skyrmions in magnetic layers, exhibit promising properties which make them especially interesting for future applications in information technology. This work examines ... -
Löslichkeit und Diffusion von Wasserstoff in dünnen Schichten amorpher ZrTiNiCuBe- und ZrAlNiCu-Legierungen
(2003-02-12)In this work the solubility of hydrogen in amorphous alloys consisting of more than two elements is investigated theoretically as well as experimentaly. By modelling, the asumption is made ... -
Measurement of the stopping power of water for carbon ions in the energy range of 1 MeV - 6 MeV using the inverted Doppler–shift attenuation method
(2016-12-08)Cancer therapy using carbon ions has gained increasing interest in the last decade due to its advantageous dose distributions. For the dosimetry and treatment planning, the accurate knowledge of the stopping power of water ... -
Mechnismen der Stromunterdrückung in supraleitenden YBa2Cu3O7-d Kleinwinkelkorngrenzen
(2004-05-10)In highly textured thin films of the high-temperature superconductor YBa2Cu3O7-d (Y-123) intragranular critical current densities of some 1011 A/m2 at 4.2 Kelvin can be achieved. In contrast to this, in bicrystalline samples ... -
Microstructural Investigations of Epitaxial GaN Films Grown on MgF2 using Transmission Electron Microscopy
(2023-10-27)For the development of novel solar-blind UV multichannel plate detectors planned for applications in astronomy, it would be advantageous to grow GaN acting as the photocathode directly on a typical window material like ... -
Mikrostruktur und Wachstum bei der ionenstrahlunterstützten Deposition von Yttrium-stabilisierten Zirkonoxid-Filmen
(2003-02-26)In this work biaxially aligned yttria-stabilized zirconia (YSZ) films fabricated by ion-beam-assisted deposition (IBAD) at room temperature were studied by transmission electron microscopy ... -
Minimizing thermal conductivity in laser deposited multilayers
(2017-01-26)Heat, light and electricity are three foundation pillars not only of physics, but also of our daily lives. Therefore, these have been studied by scientists for centuries and an always better understanding of the underlying ... -
Modelling and simulation of surface morphology driven by ion bombardment
(2006-06-22)Non-equilibrum surfaces, at nanometer length scales, externally driven via bombardment with energetic particles are known to exhibit well ordered patterns with a variety of applications in ... -
Modification of monolayer-thick semiconductors by ultra-low energy ion implantation
(2022-03-08)In this thesis, ultra-low energy (ULE) ion implantation is used to modify 2D materials such as graphene and transition metal dichalcogenides (TMDs). The existing implantation system is improved in two respects. By ... -
Neuaufbau eines Pelletron-Beschleunigers und Untersuchungen zum Laserhydrieren von Silizium
(2003-03-17)Within the context of this thesis, a pelletron accelerator laboratory NEC 9SDH-2 was moved from the Max-Planck-Institut für Kernphysik Heidelberg to the II. Physikalisches Institut der ... -
Next-Generation Perturbed Angular Correlation Spectroscopy
(2014-06-12)Time differential perturbed angular correlation (TDPAC) spectroscopy is a nuclear solid-state physics method with unique advantages: Due to the penetrating power of gamma radiation used as information carrier, it allows ... -
Optische Eigenschaften von verdünnten magnetischen Halbleitern auf GaN-Basis
(2008-06-26)Various GaN-based diluted magnetic semiconductors (DMS) were characterized in the course of this work. The main topic was GaMnN and there especially the relation between growth conditions ...