A5039155812- Nanowire Synthesis and Applications
- Thin-Film Transistor Technologies
- Semiconductor materials and devices
- Silicon and Solar Cell Technologies
- GaN-based semiconductor devices and materials
- Silicon Nanostructures and Photoluminescence
- Semiconductor materials and interfaces
- ZnO doping and properties
- Advancements in Semiconductor Devices and Circuit Design
- Semiconductor Quantum Structures and Devices
- Ga2O3 and related materials
- Photonic and Optical Devices
- Plasmonic and Surface Plasmon Research
- Metal and Thin Film Mechanics
- Gold and Silver Nanoparticles Synthesis and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Diamond and Carbon-based Materials Research
- Laser Material Processing Techniques
- Quantum Dots Synthesis And Properties
- Ion-surface interactions and analysis
- Advanced Surface Polishing Techniques
- Microplastics and Plastic Pollution
- 3D IC and TSV technologies
- Medical Imaging Techniques and Applications
- Recycling and Waste Management Techniques
Fraunhofer Institute for Ceramic Technologies and Systems
2020-2025
Freie Universität Berlin
2016-2025
Copenhagen University Hospital
2024
Mental Health Services
2024
University of Copenhagen
2024
Max Planck Institute for the Science of Light
2013-2023
Helmholtz-Zentrum Berlin für Materialien und Energie
2013-2023
University of Cyprus
2023
Austrian Institute of Technology
2023
IMEC
2023
Abstract Important structural characteristics (correlation lengths of columnar crystallites, dislocation densities, angles rotational disorder) hexagonal GaN grown by metallorganic chemical vapour deposition on c-plane sapphire are determined transmission electron microscopy and triple-axis X-ray diffractometry. films exhibit an edge density in the range 1011 cm−2, a tilt twist angle 0.1° 1.3° structure with lateral vertical correlation length 150 1000 nm respectively. The determination...
Silicon nanowire (SiNW)-based solar cells on glass substrates have been fabricated by wet electroless chemical etching (using silver nitrate and hydrofluoric acid) of 2.7 microm multicrystalline p(+)nn(+) doped silicon layers thereby creating the structure. Low reflectance (<10%, at 300-800 nm) a strong broadband optical absorption (>90% 500 measured. The highest open-circuit voltage (V(oc)) short-circuit current density (J(sc)) for AM1.5 illumination were 450 mV 40 mA/cm(2), respectively...
The fabrication of silicon nanowire-based solar cells on wafers and multicrystalline thin films glass is described. nanowires show a strong broadband optical absorption, which makes them an interesting candidate to serve as absorber in cells. operation cell demonstrated with n-doped grown p-doped wafer. From partially illuminated area 0.6 cm(2) open-circuit voltages the range 230-280 mV short-circuit current density 2 mA cm(-2) were obtained.
Microplastics are of major concerns for society and is currently in the focus legislators administrations. A small number measures to reduce or remove primary sources microplastics environment coming into effect. At moment, they have not yet tackled important topics such as food safety. However, recent developments 2018 bill California requesting analysis drinking water by standardized operational protocols. Administrations analytical labs facing an emerging field methods sampling,...
We report on an ultrasensitive, molecularly modified silicon nanowire field effect transistor that brings together the lock-and-key and cross-reactive sensing worlds for diagnosis of (gastric) cancer from exhaled volatolome. The sensor is able to selectively detect volatile organic compounds (VOCs) are linked with gastric conditions in breath discriminate them environmental VOCs exist samples but do not relate per se. Using collected actual patients volunteers who have cancer, blind analysis...
Two of the biggest challenges in medicine today are need to detect diseases a noninvasive manner and differentiate between patients using single diagnostic tool. The current study targets these two by developing molecularly modified silicon nanowire field effect transistor (SiNW FET) showing its use detection classification many disease breathprints (lung cancer, gastric asthma, chronic obstructive pulmonary disease). fabricated SiNW FETs characterized optimized based on training set that...
Microplastic research is a rapidly developing field, with urgent needs for high throughput and automated analysis techniques. We conducted review covering image from optical microscopy, scanning electron fluorescence spectral Fourier transform infrared (FT-IR) spectroscopy, Raman pyrolysis gas–chromatography mass–spectrometry, energy dispersive X-ray spectroscopy. These techniques were commonly used to collect, process, interpret data microplastic samples. This outlined critiques current...
The fracture strength of silicon nanowires grown on a [111] substrate by the vapor−liquid−solid process was measured. nanowires, with diameters between 100 and 200 nm typical length 2 μm, were subjected to bending tests using an atomic force microscopy setup inside scanning electron microscope. average calculated from maximum nanowire deflection before around 12 GPa, which is 6% Young's modulus along direction. This value close theoretical strength, indicates that surface or volume defects,...
Silicon is a high refractive index material. Consequently, silicon nanowires (SiNWs) with diameters on the order of wavelengths visible light show strong resonant field enhancement incident light, so this type nanomaterial good candidate for all kinds photonic devices. Surprisingly enough, thorough experimental and theoretical analysis both polarization dependence absorption scattering behavior individual SiNWs under defined illumination has not been presented yet. Here, present paper will...
In this letter we present calculations by three-dimensional finite element method and measurements convergent beam electron diffraction of the displacement field resulting from misfitting Ge0.85Si0.25 islands on Si(001). A good agreement between results both methods indicates that is a reliable tool to calculate strain, thus stress field, in such nanostructures. As result show substrate substantially takes part elastic relaxation process heteroepitaxial systems.
Wafer direct bonding refers to the process of adhesion two flat mirror-polished wafers without using any intermediate gluing layers in ambient air or vacuum at room temperature. The occurs due attractive long range van der Waals hydrogen forces. At temperature energy interface is low and higher annealing bonded wafer pairs has be carried out enhance energy. In this paper, we describe prerequisites for wafer-bonding occur methods prepare suitable surfaces bonding. characterization techniques...
We investigated hybrid inorganic-organic solar cells combining monocrystalline n-type silicon (n-Si) and a highly conductive polymer poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) (PSS). The build-in potential, photo- dark saturation current at this interface are monitored for varying n-Si doping concentrations. corroborate that high potential forms the junction leading to strong inversion of surface. By extracting work function valence band edge from ultraviolet photoelectron...
Silicon nanowire field effect transistors (Si NW FETs) are emerging as powerful sensors for direct detection of biological and chemical species. However, the low sensitivity Si FET toward nonpolar volatile organic compounds (VOCs) is problematic many applications. In this study, we show that modifying FETs with a silane monolayer having fraction Si–O–Si bonds between adjacent molecules greatly enhances VOCs. This can be explained in terms an indirect sensor–VOC interaction, whereby VOC...
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...
Up to now, little effort has been made exploit large-area high-throughput patterning by block copolymer (BCP) lithography generate nanostructured substrates with periods well below 100 nm for surface-enhanced Raman scattering (SERS). We show that simple BCP-templated galvanic displacement reactions yield dense arrays of mushroom-shaped gold nanopillars a period 50 nm. The nanoporous BCP films used as templates were obtained swelling-induced reconstruction reverse micelle monolayers deposited...
Small area hybrid organometal halide perovskite based solar cells reached performances comparable to the multicrystalline silicon wafer cells. However, industrial applications require scaling-up of devices module-size. Here, we report first fully laser-processed large (14.5 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ) module with an aperture ratio 95% and a power conversion efficiency 9.3%. To obtain this result, carried out...
Various nanostructures are directly written by electron-beam-induced deposition using dimethyl-gold(III)-acetylacetonate as the precursor gas. After purification, their potential applications include plasmonic devices and metamaterials. Carbon contamination of as-written structures can be completely removed low-temperature ozone treatment, leaving polycrystalline pure gold (see figure). This treatment reduces size but does not substantially alter functional shape. Detailed facts importance...
Vertically aligned silicon nanowire (SiNW) arrays have been fabricated over a large area using silver-assisted single-step electroless wet chemical etching (EWCE) method, which involves the of wafers in aqueous hydrofluoric acid (HF) and silver nitrate (AgNO3) solution. A comprehensive systematic investigation on influence different parameters, such as time (up to 15 h), solution temperature (10–80 °C), AgNO3 (5–200 mM) HF (2–22 M) concentrations, properties multi-crystalline (mc-Si) wafers,...
Papillon-Lefèvre syndrome (PLS) is characterized by nonfunctional neutrophil serine proteases (NSPs) and fulminant periodontal inflammation of unknown cause. Here we investigated extracellular trap (NET)-associated aggregation cytokine/chemokine-release/degradation normal NSP-deficient human mouse granulocytes. Stimulated with solid or soluble NET inducers, neutrophils formed aggregates both released degraded cytokines/chemokines. With increasing cell density, proteolytic degradation...
The fracture strength of ZnO nanowires vertically grown on sapphire substrates was measured in tensile and bending experiments. Nanowires with diameters between 60 310 nm a typical length 2 um were manipulated an atomic force microscopy tip mounted nanomanipulator inside scanning electron microscope. strain (7.7 +- 0.8)% the test found close to theoretical limit 10% revealed about twice as high test. From experiments Young's modulus could be within 30% that bulk ZnO, contrary lower values literature.