84 Works

Composites of Spherical Polyelectrolyte Brushes and Nanoparticles - Synthesis, Characterization and Their Use in Catalysis

Frank Polzer
PhD thesis

Electronic grain boundary properties in polycrystalline Cu(In,Ga)Se2 semiconductors for thin film solar cells

Robert Baier
PhD thesis

E9 - Fine Resolution Powder Diffractometer (FIREPOD)

The Fine Resolution Powder Diffractometer E9 (FIREPOD) is an angle-dispersive powder diffractometer optimized for a flat resolution function with a minimum width of the reflections at the 2Θ-region with the highest density of reflections. The monochromator is placed at a distance of 11 m from the reactor core, which allows for a large take-off angle at the monochromator. An evacuated beam tube and a sapphire single crystal filter reduce air scattering and epithermal neutrons. Neutron...

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.

V18 - Reflectometer for biological applications (BioRef)

BioRef is a time-of-flight reflectometer which is intended to focus on soft matter applications, especially at solid–liquid interfaces, for the investigation of biological model systems under physiological conditions including kinetic studies. The instrument was built in a joint collaboration between HZB and the University of Heidelberg with financial support by the BMBF Verbundforschung. Unique features of BioRef are the chopper system, which allows for focusing on a certain Q-range in order to support fast kinetic...

Zweiter Jahresbericht

Using the photo-induced L_3 resonance shift in Fe and Ni as time reference for ultrafast experiments at low flux soft X-ray sources

Somnath Jana, Shreyas Muralidhar, Johan Åkerman, Christian Schüßler-Langeheine & Niko Pontius
We study the optical-pump induced ultrafast transient change of the X-ray absorption at the L_3 absorption resonances of the transition metals Ni and Fe in Fe_{0.5}Ni_{0.5} alloy. We find the effect for both elements to occur simultaneously on a femtosecond timescale. This effect may hence be used as a handy cross-correlation scheme providing a time-zero reference for ultrafast optical-pump soft X-ray-probe measurement. The method benefits from a relatively simple experimental setup as the sample itself...

Optical simulations of nanotextured perovskite/silicon tandem solar cell

Klaus Jäger, Johannes Sutter, Philipp-Immanuel Schneider, Martin Hammerschmidt & Christiane Becker
Perovskite/silicon tandem solar cells (PSTSC) are amongst the most promising routes to increase the power conversion efficiency (PCE) of silicon-based solar cells. Many of the highly efficiency PSTSC use planar perovskite top cell layer stacks because of the compatibility with solution processing, which is the preferred fabrication process for perovskite solar cells. However, light management can further improve the optical performance of PSTSC. For example, smooth nanotextures can help to reduce reflective losses and increase...

PEAXIS - Combined RIXS and XPS

The station PEAXIS (PhotoElectron Analysis and X-ray Inelastic Spectroscopy) is a fixed station installed at the U41-PEAXIS beamline. It is dedicated to studies of angle-resolved RIXS (Resonant Inelastic X-ray Scattering) and PES (PhotoElectron Spectroscopy) on solids. The station is equipped with an electron energy analyzer and a RIXS spectrometer. Various sample manipulators can be installed in the sample chamber. The RIXS arm is continuously rotatable on a supporting rail in a range of 106 degrees.

Supplement to: Nano-optical designs for high efficiency monolithic perovskite-silicon tandem solar cells

Philipp Tockhorn, Johannes Sutter, Alexandros Cruz, Philipp Wagner, Klaus Jäger, Danbi Yoo, Felix Lang, Max Grischek, Bor Li, Jinzhao Li, Oleksandra Shargaieva, Eva Unger, Amran Al-Ashouri, Eike Köhnen, Martin Stolterfoht, Dieter Neher, Rutger Schlatmann, Bernd Rech, Bernd Stannowski, Steve Albrecht & Christiane Becker
Perovskite-silicon tandem solar cells allow to overcome the power conversion efficiency limit of conventional silicon solar cells. So far, various textured tandem devices have been presented aiming at improved optical performance, but optimal film growth on surface textured wafers remains challenging. Here we present perovskite-silicon tandem solar cells with periodic nanotextures that offer various advantages without compromising the material quality of solution-processed perovskite layers. We show the reduction of reflection losses in comparison to planar...

BESSY III - The Materials Discovery Facility

, K. Holldack, Z. Hüskes, A. Jankowiak, K. Kiefer, A. Meseck, R. Müller, M. Sauerborn, O. Schwarzkopf & J. Viefhaus

Einfluss von Strontium auf die Mikrostruktur von Aluminium-Silizium Legierungen

Melanie Timpel
PhD thesis

In situ Spannungs- und Strukturanalyse von Molybdän- und CuInS2-Dünnschichten mittels Röntgendiffraktion

Diana Thomas
PhD thesis

Elektronische Struktur epitaktischer Chalkopyrite und deren Heterokontakte für die Phorovoltaik

Andreas Hofmann
PhD thesis

Synthese und Charakterisierung neuartiger Dünnschicht-Photokathoden aus C3N4 und TaON für die Wasserstoffgewinnung

Steven Orthmann
diploma thesis

The Role of Cd and Ga in the Cu(In,Ga)S2/CdS Heterojunction Studied with X-Ray Spectroscopic Methods

Benjamin E. Johnson

BER II Experimental Reports 2009

Andreas Rödig, Astrid Brandt & H.A. Graf

Herstellung und thermo-physikalische Charakterisierung von superionischen Gläsern basierend auf dem AgPO3-System

Sana Qayyum
diploma thesis

Transparente und leitfähige Oxide für Chalkopyrit-basierte Dünnschichtsolarzellen

Johanna Krammer

Structural, electronic and transport properties of amorphous/crystalline silicon heterojunctions

Tim Ferdinand Schulze
PhD thesis

Plasmonische Metallcluster für organische Solarzellen

Gina Peschel
master thesis

Conceptual Design Report for a multi-turn Energy Recovery Linac-bases Synchrotron Light Facility (Femto-Science Factory)

T. Atkinson, A. Bondarenko, A. Matveenko & Y. Petenev
technical report

Neutron study of the topological flux model of hydrogen ions in water ice

J.-U. Hoffmann, K. Siemensmeyer, S. Isakov, D. J. P. Morris, B. Klemke, I. Glavatskyi, K. Seiffert, D. A. Tennant, S. Sondhi & R. Moessner
The familiarity of water ice means we often overlook its non-trivial character illustrated, for example, by the many snowflake morphologies resulting from disordered combinations of covalent and hydrogen bonds between hydrogen and oxygen atoms in water ice’s most common phase (Ih) that keep the H_2 O molecular character. Using neutron diffraction on the flat-cone diffractometer E2 at BER-II, Helmholtz-Zentrum Berlin, we probe the atomic scale configuration in the Ih phase of water ice to test...

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