84 Works

Clustering and Precipitation in Al-Mg-Si Alloys

Zeqin Liang
PhD thesis

Cd-freie Heterokontakte in Chalkopyrit-basierten Dünnschichtsolarzellen

David Kieven
PhD thesis

Microscopic properties of grain boundaries in Cu(In,Ga)Se2 and CuInS2 thin-film solar cells studied by transmission electron microscopy

Sebastian Simon Schmidt
PhD thesis

Neutron Scattering Investigations on 3d and 4f Frustrated Magnetic Insulators

Diana Lucía Quintero Castro
PhD thesis

Strukturelle Charakterisierung von Wasserstoff trennenden Gasseparationsmembranen auf Lantanoid-Wolframat-Basis

Tobias Scherb
PhD thesis

Electrochemical and Photochemical Functionalization of Au and Si Surfaces by Grafting of Diazonium and Azide Compounds

Xin Zhang

Struktur und Gitterdynamik von Gruppe-V-Elementen in ZnO

Felice Friedrich

Structural trends in off stoichiometric chalcopyrite type compound semiconductors

Christiane Stephan
PhD thesis

Anomalous Small Angle X-ray Scattering (ASAXS) analysis of nanocrystals in glass ceramics: structure and composition

Vikram Singh Raghuwanshi
PhD thesis

Solid-supported lipid membranes and their response to varied environmental conditions

Martin Kreuzer
PhD thesis

Local Structure of Al-based Amorphous Alloys after Microalloying by Element Substitution and after Ball Milling

Yao Liu
PhD thesis

Design of electron beam evaporated Si thin films for solid phase crystallized solar cells on glass

Tobias Sontheimer
PhD thesis

E11 - Fast Acquisition Laue Camera for Neutrons (FALCON)

Neutron Laue diffraction is an important method of neutron scattering for measuring single crystals. Laue diffraction patterns are generated in a matter of seconds from very small crystals i.e. <1mm3. FALCON has two scintillating plate detectors coupled to four iCCD cameras each, to produce a 2D projection of a large volume of reciprocal space in a single Laue pattern. Such images can be used to index complex crystal structures, characterise features such as twinning or...

E4 - 2-Axis-Diffractometer

The instrument is primarily suited for magnetic structure determination under various conditions, which includes magnetic fields up to 17 T, temperatures down to 30 mK and pressures up to 10 kbar. The most common application is to reveal spatial arrangement ordered spin structures. Using the polarized neutrons option facilitates the separation of magnetic contributions from nuclear scattering. The measurement of flipping ratios allows registration of very weak magnetic scattering and the mapping of spin density...

V7 - Cold Neutron Tomography and Radiography (CONRAD)

The neutron tomography beam line V7 was designed with two measuring positions: the first one is located directly at the end of the neutron guide, where a very high neutron flux is available but the image resolution is limited due to the beam divergence. The second measuring position uses a pin-hole geometry followed by more than 5m of flight tube in order to gain a high collimation ratio and image resolution. The high-flux measuring position...

Supplement to: Machine learning classification for field distributions of photonic modes

Carlo Barth & Christiane Becker
Electromagnetic modes of photonic nanostructures can exhibit increased near-field energy densities which can be applied in many fields such as biosensing, quantum dot solar cells or photon upconversion. Optimizing such systems enforces to systematically analyze large amounts of numerically obtained three-dimensional field distribution data, as in the presented dataset. The simulated system is a silicon photonic crystal slab on glass (subspace) with a hexagonal lattice of cylindrical holes. The holes are filled with a medium...

Summary and Conclusions of the Two Orbit / TRIBs User Test Week

R. Ovsyannikov, M. Roessle, K. Medjanik, H. J. Elmers, G. Schönhense, K. Holldack, G. Schiwietz, F. Trinter, U. Hergenhahn, E. Rienks, P. Guttmann, F. Kronast, M. Weigand, E. Schierle, V. Soltwisch, F. Scholz, M. Krumrey, P. Hoenicke, C. Zech & P. Goslawski

Optimizing metal grating back reflectors for III-V-on-silicon multijunction solar cells

Peter Tillmann, Benedikt Bläsi, Sven Burger, Martin Hammerschmidt, Oliver Höhn, Christiane Becker & Klaus Jäger
Multi-junction solar cells allow to utilize sunlight more effectively than single junction solar cells. In our work, we present optical simulations of III-V-on-silicon solar cells with a metal grating at the back, which experimentally have reached more than 33% power conversion efficiency. First, we perform simulations with the finite element method and compare them with experimental data to validate our model. We find that accurately modeling the investigated geometrical structure is necessary for best agreement...

CPMU17_EMIL - Hard x-ray EMIL Beamline

The CPMU17_EMIL - Hard x-ray EMIL Beamline uses a planar cryogenic in-vacuum undulator to cover the photon energy range from 700-10000eV. A toroidal mirror M1 collimates (vertically) and focusses (horizontally) the U17 beam, which is then diffracted either by a double crystal monochromator (DCM, with crystal pairs Si 111, Si 311, Si 422 selectable) or passed to a plane grating monochromator (PGM) equipped with two blazed gratings (400 and 800 l/mm). A switching mirror unit...

OAESE - Operando Absorption and Emission Spectroscopy at EMIL

In the Energy Materials In-situ Laboratory Berlin (EMIL) at the BESSY II synchrotron facility, we have set up an infrastructure that allows x-ray absorption spectroscopic (NEXAFS) studies of energy materials under operating conditions. This setup is based on a three-electrode electrochemical liquid flow-cell attached to an ultra-high vacuum chamber (UHV) dedicated for in-situ/operando studies. To isolate the cell environment containing liquid electrolyte from the UHV of the analysis chamber, a very thin (about 100 nm)...

PanDDA-analyzed data of a crystallographic fragment screening of F2X-Universal Library vs. AR

Tatjana Barthel, Jan Wollenhaupt, Gustavo M. A. Lima, Markus C. Wahl & Manfred S. Weiss
A crystallographic fragment screening (CFS) has been performed on a spliceosomal yeast protein-protein complex of Aar2 and the RNaseH-like domain of Prp8 (AR). The F2X-Universal Library is a fragment library representing the commercially available chemical space of fragments. 917 fragments have been individually screened via crystal soaking. The datasets that could be successfully auto-processed and auto-refined had been subjected to a Pan-Dataset Density Analysis (PanDDA) (Pearce et al., 2017). This analysis allows to find low...

The Surface Charge of Soft and Hard Sphere Colloidal Particles – Experimental Investigation and Comparison to Theory

Christian Schneider
PhD thesis

Hydrogen Passivation of Polycrystalline Si Thin Film Solar Cells

Benjamin Gorka

V6 - Reflectometer

The reflectometer V6 allows measuring the neutron optical reflectivities on flat surfaces at grazing angles. The reflectivity is related to the variation of the refractive index within a depth of about 200 nm, thus structural depth profiles can be studied at solid-air, solid-liquid and free liquid surfaces.

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Affiliations

  • Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany
    2
  • Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
    2
  • Optics for Solar Energy, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 16, 12489 Berlin
    2
  • Computational Nano Optics, Zuse Institute Berlin, Takustraße 7, 14195 Berlin
    2
  • Xavier University, Department of Physics, 3800 Victory Parkway, Cincinnati, OH 45207, USA
    1
  • Dept. of Physics, Princeton University, Washington Road, Princeton, NJ 08544, USA
    1
  • Berliner Hochschule für Technik, 13353 Berlin
    1
  • Google Inc., Brandschenkestrasse 110, 8002 Zürich, Switzerland
    1
  • Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, 01187 Dresden, Germany
    1
  • Institut de Systématique, Évolution, Biodiversité (UMR 7205), Muséum national d'Histoire naturelle, CNRS, Sorbonne Université, EPHE, 75005 Paris, France
    1