A5067275603- Metal and Thin Film Mechanics
- Microstructure and mechanical properties
- Aluminum Alloys Composites Properties
- Semiconductor materials and devices
- Additive Manufacturing Materials and Processes
- Magnesium Alloys: Properties and Applications
- Force Microscopy Techniques and Applications
- High Entropy Alloys Studies
- Advanced ceramic materials synthesis
- Diamond and Carbon-based Materials Research
- High-Temperature Coating Behaviors
- Additive Manufacturing and 3D Printing Technologies
- High-Velocity Impact and Material Behavior
- Titanium Alloys Microstructure and Properties
- Advanced materials and composites
- Semiconductor materials and interfaces
- Advanced Surface Polishing Techniques
- Nanowire Synthesis and Applications
- Nuclear Materials and Properties
- Metallurgy and Material Forming
- Ion-surface interactions and analysis
- nanoparticles nucleation surface interactions
- Fusion materials and technologies
- Advanced Thermoelectric Materials and Devices
- Silicon Nanostructures and Photoluminescence
Swiss Federal Laboratories for Materials Science and Technology
2016-2025
University of St. Gallen
2021-2022
Imperial College London
2019
Karlsruhe Institute of Technology
2015
Swiss Center for Electronics and Microtechnology (Switzerland)
2013-2014
Johannes Gutenberg University Mainz
2006-2014
University of Lausanne
2012
We report on the synthesis of organized arrays gold (Au) nanoparticles thermally oxidized Si wafers using sputtering as a metal deposition method in combination with sphere lithography. This simple process leads to formation honeycomb mask Au at room temperature (RT). study transformation mechanism this hexagonal array by annealing different temperatures and atmospheres. The underlying mechanisms pattern during are coalescence particles Ostwald ripening depend atmosphere. crystallinity...
The strain rate (ε˙) and temperature (T) dependent mechanical response of single crystal magnesium (Mg) micropillars compressed along the [2¯110] direction (a-axis) is investigated from room to 573 K 10-3 100 s-1. loading was chosen disfavour basal slip activation by a low Schmid factor, allowing investigation rate-sensitivities extension twinning prismatic slip. For T ≤ 423 K, plasticity governed for entire range applied rates. At > ε˙ 10 s-1, did not occur continuous plastic flow induced...
Laser powder bed fusion (L-PBF) allows for the fabrication of samples with complex geometries based on thin struts or walls. However, only few studies have focused effect these properties material fabricated using this technology. In work, we studied impact wall thicknesses below 1 mm microstructure formation and mechanical in 316L parts by L-PBF. The size geometry melt pools varied significantly between different due to denudation local preheating, resulting non-symmetrical thicker samples....
Silicon nanowires (SiNWs) were produced by nanosphere lithography and metal assisted chemical etching. The combination of these methods allows the morphology organization control Si NWs on a large area. From investigation major parameters affecting etching such as doping type, concentration substrate, we demonstrate formation new architectures consisting organized NW arrays formed micro/mesoporous silicon layer with different thickness. These investigations will allow us to better understand...
Diffusion is one of the most important phenomena studied in science ranging from physics to biology and, abstract form, even social sciences. In field materials science, diffusion crystalline solids particular interest as it plays a pivotal role synthesis, processing and applications. While this subject has been extensively for long time there are still some fundamental knowledge gaps be filled. particular, atomic scale observations thermally stimulated volume its mechanisms lacking....
Here, we present a Ge based reconfigurable transistor, capable of dynamic run-time switching between n-and p-type operation with enhanced performance compared to state-of-the-art Si devices. Thereto, have monolithically integrated an ultra-thin epitaxial and defect-free layer on insulator platform. To evade the commonly observed process variability Ni-germanides, Al-Si-Ge multi-heterojunction contacts been employed, providing stability required equal injection capabilities for electrons...
Reconfigurable field-effect transistors (RFETs), combining n-and p-type operation in a single device, have already shown promising simulation results for enhancing performance and functionality conventional devices further enabling novel adaptive computing concepts. With recent advances the formation of high-quality monolithic single-crystalline Al-Si Schottky contacts providing reproducible way to fabricate RFETs with highly symmetric operation, we are now able demonstrate their integration...
Abstract Atomic layer deposition (ALD) is one of the premier methods to synthesize ultra‐thin materials on complex surfaces. The technique allows for precise control thickness down single atomic layers, while at same time providing uniform coverage even structures with extreme aspect ratios such as deep trenches or wires. While many can be readily deposited using ALD there still a lot research going make other more accessible. When establishing new process adapting an existing reactor,...
Residual stresses and stress gradients are of great importance in all thin film systems, as they critically influence the structural stability functionality, thus lifetime, concerned devices. In this study, an improved ion beam layer removal method is developed to determine distribution copper- tungsten-based systems. Cantilevers were prepared from single, bi- tri-layer systems with individual thickness 500 nm using focused machining. Subsequently, residual profiles determined a depth...
High angular resolution electron backscatter diffraction (HR-EBSD) was coupled with focused ion beam (FIB) slicing to characterize the shape of plastic zone in terms geometrically necessary dislocations (GNDs) W single crystal 3 dimensions. Cantilevers similar size a notch were fabricated by FIB and deformed inside scanning microscope at different temperatures (21$^{\circ}$C, 100$^{\circ}$C 200$^{\circ}$C) just above micro-scale brittle-to-ductile transition (BDT). J-integral testing...
Abstract Reconfigurable field‐effect transistors, capable of being dynamically programmed during run‐time, overcome the static nature conventional complementary metal‐oxide semiconductors by reducing transistor count and circuit path delay. Thereby, SiGe Ge are predicted to boost drive currents, switching speed reduce power consumption. Nevertheless, Ge‐based reconfigurable prototypes have so far fallen short in reaching both promised performance due interface instability their contacts gate...
Abstract At the interface of thin film development and powder metallurgy technologies, this study aims to characterise mechanical properties, lattice constants phase formation Ti-Nb alloys (8–30 at.%) produced by different manufacturing methods, including conventional (PM), alloying (MA) high power impulse magnetron sputtering (HiPIMS). A central aspect research was investigate energy states achievable each synthesis method. The findings revealed that as Nb content increased, both hardness...
Additive manufactured Sc‐modified aluminum alloys hold great promise for aerospace components under high and/or complex loads. While the thermal patterns formed in melt pool during selective laser melting (SLM) of powdered material result a microstructure featuring bimodal grain size distribution, such show an isotropic mechanical response mm‐scale testing. To understand role on response, nanoindentation is performed SLM‐processed Scalmalloy ® both untreated and precipitate‐hardened alloy,...