A5046527257- Electron and X-Ray Spectroscopy Techniques
- Advanced Electron Microscopy Techniques and Applications
- Electrostatics and Colloid Interactions
- Ga2O3 and related materials
- GaN-based semiconductor devices and materials
- ZnO doping and properties
- Spectroscopy and Chemometric Analyses
- Water Quality Monitoring and Analysis
- Semiconductor Quantum Structures and Devices
- Material Dynamics and Properties
- Iron oxide chemistry and applications
- Catalytic Processes in Materials Science
- Advanced Photocatalysis Techniques
- Force Microscopy Techniques and Applications
- Quantum Dots Synthesis And Properties
- Surface and Thin Film Phenomena
- Semiconductor Lasers and Optical Devices
- Copper-based nanomaterials and applications
- Nanowire Synthesis and Applications
- Acoustic Wave Resonator Technologies
- Enhanced Oil Recovery Techniques
- Electronic and Structural Properties of Oxides
- Coagulation and Flocculation Studies
- Photonic and Optical Devices
- Magnesium Oxide Properties and Applications
University of Bremen
2016-2024
Staats- und Universitätsbibliothek Bremen
2023
Metastable $ϵ$-gallium oxide is expected to have very good properties for high-power electronics, combining the large band gap and high breakdown field of $\ensuremath{\beta}$-Ga${}_{2}$O${}_{3}$ with a spontaneous polarization. Unfortunately, synthesizing $ϵ$-Ga${}_{2}$O${}_{3}$ quite tricky, yet authors managed it. Introducing tin avoids formation volatile suboxides, which leadsto widened growth window in can beformed. Furthermore, mechanism that revealcould be relevant any binary oxide.
We present a combined experimental and theoretical study of InAs/InGaAs/GaAs quantum dots capable single photon emission in the technologically important telecom C-band for temperatures up to $77\phantom{\rule{0.28em}{0ex}}\mathrm{K}$. The structure morphology is investigated by means atomic force microscopy transmission electron microscopy. Based on these results, single-particle transition energies are modeled utilizing an atomistic tight-binding method. These compared data, thereby...
Abstract Formation of hetero‐contacts between particles different materials in nanoparticle hetero‐aggregates can lead to new functional properties. Improvement the behavior requires a detailed characterization mixing two types particles, order correlate with performance material. Scanning transmission electron microscopy (STEM) is an option for this task. To obtain statistically relevant results, STEM‐images many have be acquired and evaluated. This time‐consuming if it done manually. In...
Summary Atomic electric fields in a thin GaN sample are measured with the centre‐of‐mass approach 4D‐scanning transmission electron microscopy (4D‐STEM) using 12‐segmented STEM detector Spectra 300 microscope. The fields, charge density and potential compared to simulations an experimental measurement pixelated 4D‐STEM detector. segmented benefits from high recording speed, which enables measurements at low radiation doses. However, there is uncertainty due limited number of segments...
Abstract Hetero‐contacts are interfaces between different materials at the nanoscale leading to novel functional properties. In hetero‐aggregates, primary particles of least two mixed particle or cluster level. Double flame spray pyrolysis (DFSP) is a versatile technique for controlled synthesis such materials. Characterization hetero‐aggregates by scanning transmission electron microscopy (STEM) requires acquisition and evaluation many aggregate images in order derive statistically...
The molecular beam epitaxy grown structures are investigated, comprising of InGaAs quantum wells (QW) separated by a thin InGaAlAs barrier from InAs dots (QDs), emitting at 1.55 μm, on an InP substrate. To control the coupling between QW and QD parts thickness is changed, which commands wave function overlap. tuning that parameter allows for study influence potential energy structure states their functions in QDs, changing uncoupled system, where optical response just sum responses two...
Structural and chemical characterization of nanomaterials provides important information for understanding their functional properties. Nanomaterials with characteristic structure sizes in the nanometer range can be characterized by scanning transmission electron microscopy (STEM). In conventional STEM, two-dimensional (2D) projection images samples are acquired, about third dimension is lost. This drawback overcome STEM tomography, where three-dimensional (3D) reconstructed from a series...