Coal, petroleum, and natural gas are energy supplies, which are the main resources for human needs of energy, materials, and chemicals. In recent years, a significant change in the research activities occured, which brought conversion of biomass into useful liquid fuels in an attempt for total or partial substitution of dependency on fossil fuel co...
This thesis investigates and presents the structural and optoelectronic properties of indium nitride (InN) and indium gallium nitride (InGaN) alloys. Furthermore, this work describes the synthesis of group III-nitride alloys using a novel growth technique named migration-enhanced plasma-assisted metalorganic chemical vapor deposition (MEPA-MOCVD). ...
The rapid rise of perovskite solar cells (PSCs) is increasingly limited by the available charge-selective contacts. This work introduces two new hole-selective contacts for p–i–n PSCs that outperform all typical p-contacts in versatility, scalability and PSC power-conversion efficiency (PCE). The molecules are based on carbazole bodies with phospho...
Published in Tenside Surfactants Detergents
Lauryl phosphate monoester was synthesized from the starting materials lauryl alcohol and phosphoric acid without catalysts. Subsequently, the crude product was purified by recrystallization and characterized by Fourier transform infrared (FT-IR) and nuclear magnetic resonance (31P-NMR). From the results, it was apparent that the synthesized materi...
To improve the lifetime of lithium-ion batteries, a detailed understanding of degradation mechanisms is indispensable. Nuclear magnetic resonance (NMR) is able to unravel reversible as well as irreversible transient shape change mechanisms occurring in a battery cell, such as lithium microstructure growth and the formation of metallic lithium upon ...
The study aims to bring more knowledge about risk assessments of paint aerosol exposure to the human body. Raw manufactured nanomaterials (MNMs), either titanium dioxide or carbon black, were introduced into water-based paint formations. The evaluation of the acute and subacute potential toxicity of these samples in a whole-body (mice) exposure mod...
Der Poliervorgang stellt vielfach den letzten Veredelungsschritt für Oberflächen dar. Sehr oft müssen gerade lackierte Oberflächen zum Erzielen der Endqualität mit möglichst wenig Abtrag zumindest teilweise nachpoliert werden. Davon zu unterscheiden ist der Reparaturbereich, bei dem ein stärkerer Abtrag gefordert wird. Das Polierergebnis ist dabei ...
In this contribution, we present our recent results for high efficiency multicrystalline silicon solar cells. Based on n-type high-performance multicrystalline silicon substrates in combination with the TOPCon solar cell concept featuring a full area passivating back contact and a boron-diffused emitter as well as a plasma-etched black-silicon text...
Recombination-active defects e.g. dislocations in multicrystalline silicon (mc-Si) wafers impact the quality of solar cells. These defects can be quantified during the incoming control of silicon wafers with Photoluminescence (PL) imaging and used to rate the solar cell quality. In this work, we analyze the relevance of defect patterns in PL images...
