This work offers an approach to obtain and interpret quantitative data on silicon by innovating the field of micro-spectroscopy in the theoretical, methodical and technical regime. By introducing the time domain into micro-spectroscopy on silicon, a conceptual advance was achieved: the immediacy of approaching the charge carrier lifetime within a t...
Der globale Wettbewerb fordert von schweißtechnischen Fertigungsverfahren und Verfahrensentwicklungen eine starke Konzentration auf die Leistungsfähigkeit und die Wirtschaftlichkeit. Beim Metall-Schutzgasschweißen (MSG-Schweißen) kommen deshalb zunehmend MSG-Hochleistungsverfahren zum Einsatz. Parallel zu dem wirtschaftlichen Druck steigt das Bewus...
In this thesis a method and a suitable IT-support for on-demand delivery in Make-to-Order (MTO) construction supply chains (SCs) is presented. The methodology is applied and validated in three industrial case studies. A compendium of 10 guidelines is presented for a wider practical application. In the last part, the requirement analysis and specifi...
As early as three years ago, even before coworking was a buzz word, our study »The Fascination of Coworking - Potentials for Companies and their Employees« was published. The book was met with great interest in equal measure from freelancers and startups, coworking spaces and businesses. The next step is taken with this study: we address the questi...
The implantation of stents is a common treatment of arteriosclerotic vessel diseases. However, a re-occlusion, a so-called restenosis, often occurs within a few months after the intervention. Despite the development of drug-eluting stents this problem has not been solved. There are no simple and robust diagnostic methods. A sensor system for the de...
This work covers the development of an efficient optical simulation formalism for silicon solar cells with structured interfaces that can operate in different optical regimes; the comparison of photonic structures with regard to the optical solar cell performance; the structure fabrication via nanoimprint lithography and the demonstration of enhanc...
Nicht nur die Effizienz von Silicium-Solarzellen verzeichnet stetig Gewinne; auch die Komplexität der Solarzellen nimmt zu. Dieser Umstand verlangt nach Methoden, die den Zugang zum Verständnis der Physik dieser Solarzellen erleichtern. Inhalt dieser Arbeit ist daher die umfassende numerische Simulation zum Zwecke der Charakterisierung und Optimier...
Überwachung und Anpassung ist die Voraussetzung für die kontinuierliche Verbesserung von Geschäftsprozessen. Gewachsene Systemarchitekturen, Verteilung und Ressourcenknappheit erschweren aber die Einführung bestehender Softwarelösungen. Diese Arbeit beschreibt einen modellbasierten Ansatz, mittels dem sich aus einem grafischen Modell mit geringem A...
The focus of this work is the investigation of stimulated emission depletion (STED) and lateral charge carrier motion within InGaN/GaN quantum wells of Indium Gallium Nitride (InGaN) based LEDs. In the first part, the properties of the STED effect in blue InGaN quantum wells are studied and compared to those of dye systems usually used in STED micr...
Increasing the solar cell efficiency by applying advanced cell architectures is one route for crystalline silicon wafer based PV to achieve significant cost reduction. An elegant strategy to overcome the limiting losses of the currently dominating solar cell designs based on diffused homojunctions is the application of passivating and carrier selec...
