Browsing Fakultät für Physik (inkl. GAUSS) by Advisor & Referee "Seibt, Michael Prof. Dr."
Now showing items 1-20 of 41
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Development of in-situ transmission electron microscopy techniques for electrochemistry
(2025-02-18)In this doctoral thesis, two newly developed in-situ transmission electron microscopy (TEM) methods are introduced, and their applications are demonstrated. The first one allows the insitu characterization and analysis ... -
Non-equilibrium Phases in Jahn-Teller-distorted Perovskite Manganites
(2023-12-04)Optical control of condensed matter, being inherently fast and energy efficient, sparks hope for potential technical applications. However, these require a fundamental understanding of the physical mechanisms behind. In ... -
Elektronenmikroskopische Untersuchung des Einflusses elektrischer Felder auf das Sinterverhalten von Oxidkeramiken
(2023-11-09)Despite the wide application potential of flash sintering for processing ceramic materials, the physical origins of the effect remain unclear. Therefore, the primary objective of this work is to gain a deeper understanding ... -
Electronic and Structural Properties of Heterojunctions in Solar Cells studied by In-situ and Analytical Transmission Electron Microscopy
(2023-11-03)The overarching goal of this dissertation is to investigate new principals to increase photovoltaic efficiency. In this context, three topics are presented, one concerning the application of carrier selective contacts ... -
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 ... -
Phase-Dependent Energy Dissipation Processes in La0.7Sr0.3MnO3 and (La0.6Pr0.4)0.7Ca0.3MnO3 after an Ultrashort Optical Excitation
(2023-08-31)La0.7Sr0.3MnO3 (LSMO) and (La0.6Pr0.4)0.7Ca0.3MnO3 (LPCMO) are perovsikte manganites which both show a ferromagnetic-to-paramagnetic phase transition. Interestingly, the development of the new phase when crossing the ... -
Interlayer effect on the hydrogen uptake in Vanadium films: Stress development, surface topography and optical behavior changes
(2023-07-13)The purpose of this study is to investigate hydrogen absorption-related properties changes of nanocrystalline thin films by varying the elastic constraints condition. The elastic constraint condition is varied by using ... -
UV laser modification of transparent materials for photonic applications
(2023-04-28)Photonic applications have experienced strong growth in recent years. Due to increasing digitalization and automation in all areas of life, further growth of photonics is expected in the future. The broad range of photonic ... -
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 ... -
In-situ Environmental Transmission Electron Microscopy Investigation of Perovskite Oxide Thin Films During Electrochemical Oxygen Evolution Reaction.
(2022-07-21)Despite many theoretical and experimental efforts to find active catalysts in oxygen evolution reaction (OER), the mechanism for high activity and long-term OER stability remains elusive. Catalyst-electrolyte interface ... -
Kationordnung und Grenzflächeneffekte in stark korrelierten Elektronensystemen
(2021-10-05)The work is about cation ordering and interface mechanism in strongly correlated electron systems -
Hierarchical Mechanical Properties of Wood Cell Wall in Microscale and Nanoscale
(2021-09-21)As one of the remarkable hybrid materials in nature, wood chooses the smartest way to bear mechanical loads by using the least amount of base materials and creates outstanding functional mechanical properties comparable ... -
Structural and Electronic Investigation of Strongly Correlated Transition Metal Oxide Perovskite Thin Films and Interfaces using In-situ Transmission Electron Microscopy
(2021-09-09)Discussing the necessity as well as possible details of global strategies to reduce and eventually eliminate the anthropogenic climate change (ACC) is a delicate matter, which easily leads to statements based on ... -
Mikrostrukturänderungen durch hohe elektrische Stromdichten in Eisen-Kohlenstoff Dünnschichten
(2021-08-11)Processing of materials with high electric and magnetic fields is a growing topic in material science. Yet, the interactions of fields and currents are complex and not fully understood. Therefore, the impact of high direct ... -
In-Situ Environmental TEM Studies of Electro- and Photo-Electrochemical Systems for Water Splitting
(2021-02-22)This thesis presents studies on the structure and stability of materials for electrochemical water splitting and the changes in the active state. The stability of a TiO2 protection layer on a silicon multi-junction is ... -
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 ... -
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 ... -
Implementation and quantification of scanning transmission EBIC experiments for measuring nanometer diffusion lengths in manganite-titanite p-n heterojunctions
(2019-01-08)The scanning transmission electron beam induced current (STEBIC) approach to measure charge carrier diffusion lengths in the nanometer range in 3rd generation photovoltaics devices is presented, evaluated and applied to ... -
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 ... -
TEM in-situ Untersuchungen an Ti-Ni basierten Formgedächtnislegierungen
(2018-05-03)Shape memory alloys (SMAs) are named after their ability to recover plastic deformation upon heating and return to their original undeformed shape. The key mechanism responsible for this behavior is a reversible diffusionless ...