News HZB Synergy

Research Highlights

  • Laser light for writing and erasing information – a strong laser pulse disrupts the arrangement of atoms in an alloy and creates magnetic structures (left). A second, weaker, laser pulse allows the atoms to return to their original lattice sites (right). Image: Sander Münster / HZDR18.04.2018

    Writing and deleting magnets with lasers

    Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia in Charlottesville, USA have found a way to write and delete magnets in an alloy using a laser beam – a surprising effect. The reversibility of the process opens up new possibilities in the fields of material processing, optical technology, and data storage. [...].

  • The magnetosomes form a chain inside the bacteria's cell shows the electron cryotomography (ECT). Credit:10.1039/C7NR08493E16.04.2018

    BESSY II sheds light on how the internal compass is constructed in magnetotactic bacteria

    Bacteria exist in many shapes and with very different talents. Magnetotactic bacteria can even sense the earth’s magnetic field by making use of magnetic nanoparticles in their interior that act as an internal compass. Spanish teams and experts at Helmholtz-Zentrum Berlin have now examined the magnetic compass of Magnetospirillum gryphiswaldense at BESSY II. Their results may be helpful in designing actuation devices for nanorobots and nanosensors for biomedical applications. [...].

  • A synchrotron source point image of a bending magnet of the Twin Orbit modus. The second orbit closes after three revolution and is winding around the standard orbit at the center. Credit: HZB15.03.2018

    Twin Orbit operation successfully tested at BESSY II

    The first “Twin Orbit User Test week” at BESSY II in February 2018 was a big success and can be considered as an important step towards real user operation. Physicists at Helmholtz-Zentrum Berlin have been able to store two separate electron beams in one storage ring. The twin orbit operation mode can serve users with different needs of the time structure of the photon pulses simultaneously and offers elegant options regarding the future project BESSY VSR. [...].

  • Pencil, paper and co-polymer varnish are sufficient for a thermoelectrical device. Credit: HZB16.02.2018

    Hidden talents: Converting heat into electricity with pencil and paper

    Thermoelectric materials can use thermal differences to generate electricity. Now there is an inexpensive and environmentally friendly way of producing them with the simplest of components: a normal pencil, photocopy paper, and conductive paint are sufficient to convert a temperature difference into electricity via the thermoelectric effect. This has now been demonstrated by a team at the Helmholtz-Zentrum Berlin. [...].

  • The new building block (left, red outline) comprises two modified starting molecules connected to each other by a silver atom (blue). This leads to complex, semiregular tessellations (right, microscope image). Image: Klappenberger and Zhang / TUM23.01.2018

    User experiment at BESSY II: Complex tessellations, extraordinary materials

    Simple organic molecules form complex materials through self-organization

    An international team of researchers lead by the Technical University of Munich (TUM) has discovered a reaction path that produces exotic layers with semiregular structures. These kinds of materials are interesting because they frequently possess extraordinary properties. In the process, simple organic molecules are converted to larger units which form the complex, semiregular patterns. With experiments at BESSY II at Helmholtz-Zentrum Berlin this could be observed in detail. [...].

  • SEM-images of the different perovskite solar cell architectures, left with planar interface, right with mesoporous interface. Images are coloured: metal oxide (light blue), interface (red), perovskite (brown), hole conducting layer (dark blue), topped with contact (gold). Scale bar is 200 nm. Image: A. Gagliardi/TUM18.01.2018

    Perovskite solar cells: mesoporous interface mitigates the impact of defects

    The nominal cell operating life of perovskite solar cells is strongly influenced by their inner architecture.This was shown by two scientists at the Helmholtz-Zentrum Berlin and the Technical University of Munich. They combined experiments with numerical simulations in order to explain this observation. [...].

  • Simplified cross-section of a perovskite solar cell: the perovskite layer does not cover the entire surface, but instead exhibits holes. The scientists could show that a protective layer is being built up which prevents short circuits. Picture: HZB15.01.2018

    Perovskite solar cells: perfection not required!

    Experiments at BESSY II reveal why even inhomogeneous perovskite films are highly functional 

    Metal-organic perovskite layers for solar cells are frequently fabricated using the spin coating technique. If you follow the simplest synthesis pathway and use industry-relevant compact substrates, the perovskite layers laid down by spin coating generally exhibit numerous holes, yet attain astonishingly high levels of efficiency. The reason that these holes do not lead to significant short circuits between the front and back contact and thus high-rate charge carrier recombination has now been discovered by a HZB team headed by Dr.-Ing. Marcus Bär in cooperation with the group headed by Prof. Henry Snaith (Oxford Univ.) at BESSY II. [...].

Neutrons

    Photons

    • Laser light for writing and erasing information – a strong laser pulse disrupts the arrangement of atoms in an alloy and creates magnetic structures (left). A second, weaker, laser pulse allows the atoms to return to their original lattice sites (right). Image: Sander Münster / HZDR18.04.2018

      Writing and deleting magnets with lasers

      Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia in Charlottesville, USA have found a way to write and delete magnets in an alloy using a laser beam – a surprising effect. The reversibility of the process opens up new possibilities in the fields of material processing, optical technology, and data storage. [...].

    • The magnetosomes form a chain inside the bacteria's cell shows the electron cryotomography (ECT). Credit:10.1039/C7NR08493E16.04.2018

      BESSY II sheds light on how the internal compass is constructed in magnetotactic bacteria

      Bacteria exist in many shapes and with very different talents. Magnetotactic bacteria can even sense the earth’s magnetic field by making use of magnetic nanoparticles in their interior that act as an internal compass. Spanish teams and experts at Helmholtz-Zentrum Berlin have now examined the magnetic compass of Magnetospirillum gryphiswaldense at BESSY II. Their results may be helpful in designing actuation devices for nanorobots and nanosensors for biomedical applications. [...].

    • A synchrotron source point image of a bending magnet of the Twin Orbit modus. The second orbit closes after three revolution and is winding around the standard orbit at the center. Credit: HZB15.03.2018

      Twin Orbit operation successfully tested at BESSY II

      The first “Twin Orbit User Test week” at BESSY II in February 2018 was a big success and can be considered as an important step towards real user operation. Physicists at Helmholtz-Zentrum Berlin have been able to store two separate electron beams in one storage ring. The twin orbit operation mode can serve users with different needs of the time structure of the photon pulses simultaneously and offers elegant options regarding the future project BESSY VSR. [...].

    • BESSY II - New kitchen and break area. [Photo: HZB/P. Dera]24.01.2018

      BESSY II – New kitchen for users and employees

      At the start of 2018, we were all greeted with a new kitchen and break area on the first floor of BESSY II, in Adlershof. The final touches have now been put in place and the kitchen is in full use. [...].

    • The new building block (left, red outline) comprises two modified starting molecules connected to each other by a silver atom (blue). This leads to complex, semiregular tessellations (right, microscope image). Image: Klappenberger and Zhang / TUM23.01.2018

      User experiment at BESSY II: Complex tessellations, extraordinary materials

      Simple organic molecules form complex materials through self-organization

      An international team of researchers lead by the Technical University of Munich (TUM) has discovered a reaction path that produces exotic layers with semiregular structures. These kinds of materials are interesting because they frequently possess extraordinary properties. In the process, simple organic molecules are converted to larger units which form the complex, semiregular patterns. With experiments at BESSY II at Helmholtz-Zentrum Berlin this could be observed in detail. [...].

    • A look into the lab where the components of the electron source were tested.08.01.2018

      Milestone reached: electron source for bERLinPro produces its first beam

      On the HZB Adlershof campus, researchers are building a prototype of an energy-recovery linear accelerator (bERLinPro). Intensive research has been going on for years to develop the worldwide unique key components required for this accelerator. Now, the scientists and engineers have reached a very important milestone: from the interactions between cathode, laser pulse and electric field inside the cavity, the first electrons have been produced and accelerated. [...].

    Events and Dates

    • The HZB experiment EDDI at BESSY II (Credit: HZB).12.10.2017

      Announcement: EDDI (farewell) Workshop

      After 14 years of successful user operation, EDDI will shutdown in August 2018. We decided to take this as an occasion to organize an EDDI (farewell) workshop. [...].

    General

    • (Image: pixabay)27.04.2018

      New version of our user access tool GATE

      We are currently working on a new version of our central web-based user tool GATE, the general access tool to the experimental infrastructure of HZB. The changes are very extensive and the workload is comparable to a brand new development. [...].

    • The review panel of the research field "Matter" visited the HZB on 11th January 2018. Photo. HZB/J. Bierbaum19.04.2018

      Results of evaluation by international panel of experts: support for HZB’s future, calls for rapid planning of BESSY III

      The Helmholtz-Zentrum Berlin (HZB) has received an evaluation of “excellent” in a review of science programmes undertaken at all Helmholtz Research Centres. This provides the foundation for future financing of HZB.

      Two committees of leading international scientists visited the HZB for a week each at the beginning of this year. They evaluated the HZB's contributions to the Helmholtz programmes in the research areas of “Matter” and “Energy”. Now the written evaluations are available. The team spirit of all employees involved in the HZB was particularly emphasised. [...].

    • By using independent flexible module tables various solar module samples can be installed under different orientations at the same time.22.03.2018

      Investigation of solar modules under "real" conditions - The outdoor test bed

      At the outdoor test bed we investigate the characteristics of solar mini modules under operating conditions. During the course of the year the modules are exposed to snow and freeze as well as to hot temperatures and a varying spectral irradiance.

      [...].

    • A synchrotron source point image of a bending magnet of the Twin Orbit modus. The second orbit closes after three revolution and is winding around the standard orbit at the center. Credit: HZB15.03.2018

      Twin Orbit operation successfully tested at BESSY II

      The first “Twin Orbit User Test week” at BESSY II in February 2018 was a big success and can be considered as an important step towards real user operation. Physicists at Helmholtz-Zentrum Berlin have been able to store two separate electron beams in one storage ring. The twin orbit operation mode can serve users with different needs of the time structure of the photon pulses simultaneously and offers elegant options regarding the future project BESSY VSR. [...].

    • Benjamin Rotenberg is a guest researcher at the HZB-Institute for Solar Fuels in 2018. Photo:CNRS/Cyril Fresillon23.02.2018

      Guest researcher at HZB: Bessel Prize Winner Benjamin Rotenberg

      Prof. Benjamin Rotenberg has received a Friedrich Wilhelm Bessel Research Prize from the Alexander von Humboldt Foundation for 2018 and will be spending time regularly as a guest researcher at the Helmholtz-Zentrum Berlin. Rotenberg is a researcher of the Centre National de Recherche Scientifique (CNRS) and heads a research group in Sorbonne Université in Paris. He works in an interdisciplinary area spanning physics and chemistry for modelling transport processes in materials, at interfaces, and in electrolytes. [...].

    • The review panel of the research field "Matter" visited the HZB on 11th January 2018.05.02.2018

      HZB passed the scientific evaluations successfully

      In January 2018, Helmholtz-Zentrum Berlin was evaluated in the scope of the Helmholtz Association’s programme-oriented funding (POF) review in the two research fields of “Matter” and “Energy”. The members of the review panels were internationally experienced scientists. From what we have already heard back from the review panels, the research achievements of HZB in both research fields were presented very convincingly. [...].

    • BESSY II - New kitchen and break area. [Photo: HZB/P. Dera]24.01.2018

      BESSY II – New kitchen for users and employees

      At the start of 2018, we were all greeted with a new kitchen and break area on the first floor of BESSY II, in Adlershof. The final touches have now been put in place and the kitchen is in full use. [...].

    • Oxford PV – The Perovskite Company's industrial site in Brandenburg an der Havel, Germany where the company is working rapidly to transfer its advanced perovskite on silicon tandem solar cell technology to an industrial scale process. Credit: Oxford PV09.01.2018

      Oxford PV collaborates with HZB to move perovskite solar cells closer to commercialisation

      Perovskite solar technology leader Oxford PV collaborates with leading German research centre to support the accelerated transfer of its technology into silicon cell manufacturing lines. [...].

    • A look into the lab where the components of the electron source were tested.08.01.2018

      Milestone reached: electron source for bERLinPro produces its first beam

      On the HZB Adlershof campus, researchers are building a prototype of an energy-recovery linear accelerator (bERLinPro). Intensive research has been going on for years to develop the worldwide unique key components required for this accelerator. Now, the scientists and engineers have reached a very important milestone: from the interactions between cathode, laser pulse and electric field inside the cavity, the first electrons have been produced and accelerated. [...].