A5012382109- ZnO doping and properties
- GaN-based semiconductor devices and materials
- Ga2O3 and related materials
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- Advanced X-ray Imaging Techniques
- Quantum Dots Synthesis And Properties
- Nanowire Synthesis and Applications
- Copper-based nanomaterials and applications
- Semiconductor Quantum Structures and Devices
- Electronic and Structural Properties of Oxides
- Advanced Electron Microscopy Techniques and Applications
- Chalcogenide Semiconductor Thin Films
- Semiconductor materials and interfaces
- Semiconductor materials and devices
- Silicon and Solar Cell Technologies
- X-ray Diffraction in Crystallography
- Metal and Thin Film Mechanics
- Ion-surface interactions and analysis
- Thin-Film Transistor Technologies
- Geochemistry and Geologic Mapping
- Advancements in Semiconductor Devices and Circuit Design
- Luminescence Properties of Advanced Materials
- Radioactive element chemistry and processing
- Metal Extraction and Bioleaching
European Synchrotron Radiation Facility
2016-2025
Instituto de Ciencia de Materiales de Madrid
2017-2023
Consejo Superior de Investigaciones Científicas
2017-2023
University of Turin
2018
European Science Foundation
2005-2016
Universitat de València
1997-2011
Fraunhofer Institute for Solar Energy Systems
2009
Schott (Germany)
2000-2004
Technical University of Munich
2000-2004
University of Bristol
2003
While the role of microorganisms as main drivers metal mobility and mineral formation under Earth surface conditions is now widely accepted, secondary gold (Au) commonly attributed to abiotic processes. Here we report that biomineralization Au nanoparticles in metallophillic bacterium Cupriavidus metallidurans CH34 result Au-regulated gene expression leading energy-dependent reductive precipitation toxic Au(III)-complexes. C. metallidurans, which forms biofilms on grains, rapidly accumulates...
Within the framework of ESRF Phase I Upgrade Programme, a new state-of-the-art synchrotron beamline ID16B has been recently developed for hard X-ray nano-analysis. The construction was driven by research areas with major scientific and societal impact such as nanotechnology, earth environmental sciences, bio-medical research. Based on canted undulator source, this long provides nanobeams optimized mainly spectroscopic applications, including combination fluorescence, diffraction, excited...
The Moore's law trajectory of hard x-ray spatial resolution extrapolates to a few nanometers within the next years, thereby promising critical space-resolved structural, electronic, and compositional nanoscale characterizations for wide variety materials. This review addresses capabilities advantages microbeam nanobeam techniques compared photon, electron, neutron, ion probes through selected applications including semiconductors, superconductors, metals, nanostructured devices.
The ESRF synchrotron beamline ID22, dedicated to hard X-ray microanalysis and consisting of the combination fluorescence, absorption spectroscopy, diffraction 2D/3D imaging techniques, is one most versatile instruments in microscopy science. This paper describes present characteristics, recent technical developments, as well a few scientific examples from years operation. upgrade plans adapt growing needs user community are briefly discussed.
We report on the local structure of single Co-implanted ZnO nanowires studied using a hard X-ray nanoprobe. fluorescence maps show uniform Zn and Co distributions along wire within length scale beam size. The data allow estimation content nanowire. Polarization dependent absorption near edge shows no structural disorder induced neither in radial nor axial directions implanted after subsequent annealing. Co2+ ions occupy sites into wurtzite lattice. Extended fine reveal high order host...
The local prebreakdown behavior of a damage etched multicrystalline silicon solar cell produced from virgin grade feedstock was characterized. At the position micrometer-scaled sites, which correlate with recombination active defects found along grain boundaries, micro-x-ray fluorescence mappings revealed presence Fe precipitate colonies. These measurements represent direct evidence that transition metal clusters lead to decreased breakdown voltage and cause soft diode breakdown.
Twenty sepiolites of known composition from different origins were analyzed to quantify the variability in structural parameters and its possible relationships with morphology. Morphology SEM analyses led classify into several groups, beyond two simple macroscopic or clay groups. X‑ray powder diffraction synchrotron light was used discuss a b cell nature cations occupancy octahedral shell. Rietveld refinement using ideal sepiolite model is performed on at temperatures: 225 °C (for...
In this work, we report on the composition, short- and long-range structural order of single molecular beam epitaxy grown InxGa1–xN nanowires using a hard X-ray synchrotron nanoprobe. Nano-X-ray fluorescence mapping reveals an axial radial heterogeneous elemental distribution in wires with Ga accumulation at their bottom outer regions. Polarization-dependent nano-X-ray absorption near edge structure demonstrates that despite modulation, tetrahedral around atoms remains along nanowires....
Unrivaled XANES imaging resolution of <100 nm, and XBIC conclusively identify the active area a nanowire device.
The bacterium Cupriavidus metallidurans can reduce toxic gold(I/III) complexes and biomineralize them into metallic gold (Au) nanoparticles, thereby mediating the (trans)formation of Au nuggets. In Au-rich soils, most transition metals do not interfere with resistance this to mobile be removed from cell by plasmid-encoded metal efflux systems. Copper is a noticeable exception: presence Cu ions results in synergistic toxicity, which accompanied an increased cytoplasmic content formation...
Lattice-matched GaN layers are grown by metalorganic chemical-vapor deposition on free-standing substrates, which were fabricated laser-induced liftoff of 300-μm-thick films hydride vapor-phase epitaxy. Pretreatment the before homoepitaxial growth involved mechanical polishing Ga-face surface and a final Cl-based plasma etch. By combination high-resolution x-ray diffraction, atomic-force microscopy, as well Raman photoluminescence spectroscopy, structural optical properties lattice-matched...
In this study, we report the application of synchrotron radiation microprobe to analysis Mn-rich clusters in GaN. From Mn and Ga fluorescence line intensity ratio, an average concentration 11% was deduced. A combination mapping with spectroscopic techniques enabled us examine not only cluster elemental nature but also their crystallographic orientation on submicron scale. The strong polarization-dependent x-ray absorption near-edge structure features showed preservation hexagonal symmetry...
Abstract Metallic impurities are detrimental to many silicon devices and limit the efficiency of multicrystalline solar cells. Therefore they a major subject ongoing research. Photoluminescence spectroscopy is promising technique for detecting precipitated metals in because its sensitivity minority carrier density specific types defects; however impact on defect luminescence could not be clarified yet. In this letter we examine role micron‐sized iron copper precipitates direct bonded wafers...
Crossed nanowire structures are the basis for high-density integration of a variety nanodevices. Owing to critical role nanowires intersections in creating hybrid architectures, it has become challenge investigate local structure crossing points metal oxide nanowires. Thus, if intentionally grown crossed well-patterned, an ideal model study junction is formed. By combining electron and synchrotron beam nanoprobes, we show here experimental evidence impurities coupling formation, structural...
Semiconductor nanowires offer new opportunities for optoelectronic and spintronic nanodevices. However, their full potential is ultimately dictated by our ability to control multiple property-function relationships taking place at the nanoscale in spatial time domains. Only a combination of high-resolution analytical techniques can provide comprehensive understanding complex functionalities. Here we describe how multimodal hard X-ray nanoprobe addresses fundamental questions nanowire...
In this work, an imaging tool to investigate optical inhomogeneities with site and chemical sensitivities has been integrated in a hard x-ray microprobe. Freestanding GaN epitaxially grown GaN:Mn on α-Al2O3 are used exploit the unprecedented scanning excited luminescence technique. Optical images of radiative recombination channels reported for several impurities defect centers sapphire compounds. Within experimental accuracy, visible nonuniformity characterizes Mn good correlation former...
Photovoltaic power generation capacity is increasing tremendously as a result of strong renewable energy policies and environmental concerns. In particular, the use solar modules to generate electricity has grown significantly in Cuba recently. Based on statistics published by European Commission, installed photovoltaic increased from 15 100 MW timeframe 2015–2019. this context, efficiency one most critical figures merit module. It describes ratio produced electrical received irradiance....
The ID22 beamline is dedicated to hard X-ray microanalysis allowing the combination of fluorescence, spectroscopy, diffraction and tomography techniques in a wide energy range from 6 70 keV. recent installation an in-vacuum undulator, new sample stage adaptation various focusing optics has contributed great improvement capabilities beamline, which now accessed by user community issued medical, earth environmental science, archaeology material science. Many applications requiring low...