News and press releases 2014

  • <p>Crystal structures of HgBa<sub>2</sub>CuO<sub>4</sub>+ and YBa<sub>2</sub>Cu<sub>3</sub>O<sub>6</sub>+</p>22.12.2014

    Universality of charge order in cuprate superconductors

    Charge order has been established in another class of cuprate superconductors, highlighting the importance of the phenomenon as a general property of these high-Tc materials [...].

  • <p>Prof. Dr. Oguz Okay lehrt Physikalische Chemie an der Istanbul Technical University und gilt als einer der besten Polymerforscher der T&uuml;rkei. Nun kommt er als Gast ans HZB.</p>18.12.2014

    Georg-Forster-Forschungspreis an Oguz Okay

    (german)

    Die Alexander von Humboldt-Stiftung hat gestern acht mit jeweils 60.000 Euro dotierten Georg Forster-Forschungspreise vergeben. Unter den Ausgezeichneten ist  Prof. Dr. Oguz Okay (59), Istanbul Technical University, der nun für einen Gastaufenthalt an das HZB-Institut für Weiche Materie und Funktionale Materialien nach Berlin kommt. [...].

  • 18.12.2014

    Hochfeldmagnet sucht Neutronenleiter

    (german)

    Am Freitag, den 12. Dezember 2014 fand der Umzug des Hochfeldmagneten an seinen endgültigen Aufstellungsort in der Neutronenleiterhalle statt. Eine Spezialfirma für Maschinentransporte bugsierte den über 25 Tonnen schweren Stahlkoloss aus dem HFM-Technikum heraus und setzte ihn in Bewegung. [...].

  • <p>The Advanced Photon Source facility illuminated by lightning. (Credit: Argonne National Laboratory)</p>10.12.2014

    D-Lecture: A Light and a Beam

    Dr. Alexander Zholents from Argonne National Laboratory will present on Thursday 18th December 2014 his thoughts on "A Light and a Beam: a Theme with Variations". The presentation will be given at the lecture hall of the Wilhem-Conrad-Röntgen-Campus of HZB at 2 pm. After the presentation, we invite you to “Glühwein” and informal discussion.

    What: D-Lecture

    When: 14:00, 18. december 2014

    Where: BESSYII, Lecture Hall

    [...].

  • <p>Markus Ries (left) and Alex Manuel Frano Pereira (right) were awarded by Prof. Mathias Richter of "HZB Circle of Friends" the Ernst-Eckhard Koch-Prize for their outstanding PhD-projects. Credit: M. Setzpfand/HZB</p>08.12.2014

    Lively exchange at User Meeting

    From December 3 to 5, more than 500 users of HZB's BER II and BESSY II large-scale equipment met up to discuss the current state of technology and exchange their views on pressing scientific issues. [...].

  • 01.12.2014

    Sixth Joint BER II and BESSY II User Meeting

    The annual Joint HZB User Meetings will provide an overview of the many exciting and inspiring research results obtained at our facilities in the past year. The Sixth Joint BER II and BESSY II User Meeting will take place at Berlin-Adlershof from December 3rd to December 5th, 2014. The neutrons session will take place at Berlin-Wannsee on Wednesday, 3rd December, followed by Dinner at Café Jahn. [...].

  • <p>The new organic material is able to &ldquo;add up&rdquo; low-energy photons (red) to yield higher-energy light (blue), which can then be harvested by the solar cell. Credit: Y. Y. Cheng/UNSW</p>27.11.2014

    Organic layer adds light particles

    Solar cells can only use photons with energies above a specific threshold to generate electricity. A German-Australian research collaboration has now combined solar cells with an organic material which can “add up” low-energy photons to yield higher-energy light, which can then be harvested by the solar cell. In an invited review paper published in the prestigious journal Energy & Environmental Science the scientists give an overview on the fascinating phenomenon of photonic upconversion and report new results: The organic layers show less photo-degradation than suspected and may also be used for other optoelectronics applications. [...].

  • <p>Prof. Dr. Andreas Marx is this year&rsquo;s recipient of the Karl Heinz Beckurts Award.</p>26.11.2014

    Artificial evolution for medical application

    2014 Karl Heinz Beckurts Award goes to Prof. Dr. Andreas Marx

    Prof. Dr. Andreas Marx of the University of Konstanz is this year’s recipient of the Karl Heinz Beckurts Award. The 30,000 Euro award will be presented to Marx on Monday, December 1, 2014, at 5:30 pm in Max-Joseph-Saal at the Munich Residenz. With its nomination, the Beckurt Foundation is recognizing a scientist whose truly interdisciplinary way of thinking has inspired him to join together the scientific disciplines of chemistry, biology, and biotechnology. Marx’ approach has already resulted in important applications that have since found their way into medical diagnostics and cancer therapy, among others. [...].

  • <p>Patient im Behandlungsstuhl</p> <p>Bild: Boris Geilert</p>25.11.2014

    2500 Augentumor-Patienten von der Charité mit Protonen am Helmholtz-Zentrum Berlin bestrahlt

    (german)

    Am Freitag, dem 21. November 2014, wurde um 16:10 Uhr die Bestrahlungsserie der 2500.  Protonentherapiepatientin, am Helmholtz-Zentrum Berlin erfolgreich abgeschlossen. Seit 1998 behandelt die Augenklinik der Charité - Universitätsmedizin Berlin, Campus Benjamin Franklin, in Kooperation mit der dortigen Klinik für Radioonkologie und Strahlentherapie Augentumore, insbesondere Aderhautmelanome, mit dem Protonenstrahl des Helmholtz-Zentrums Berlin für Materialien und Energie am Campus Lise-Meitner in Berlin Wannsee. [...].

  • <p>Sch&uuml;lerlabore im HZB gibt es u.a.zu den Themen "Licht und Farbe" und "Solarenergie". Beim Helmholtz-Tag am 18. November erfahren die Sch&uuml;lerinnen und Sch&uuml;ler etwas &uuml;ber Magnetismus. (Foto: kmh)</p> <p></p>17.11.2014

    Helmholtz-Tag im Schülerlabor

    (german)

    Die Schülerlabore der Helmholtz-Gemeinschaft veranstalten am 18. November zum dritten Mal den Helmholtz-Tag. Mit dabei ist auch das Helmholtz-Zentrum Berlin. Schülerinnen und Schüler von der Grund- bis zur Berufsschule erhalten einen Einblick in die Forschungsarbeit von Hermann von Helmholtz und können zudem in den Laboren selbst experimentieren. Der Namenspatron der Helmholtz-Gemeinschaft gehörte zu den bedeutendsten Naturwissenschaftlern des 19. Jahrhunderts und war einer der letzten Universalgelehrten. [...].

  • <p>Both figures display experimental data on the &ldquo;Dirac cone".</p>14.11.2014

    Warping in topological insulators

    Topological insulators are promising to develop into a material for lossless electricity and information transport. Now, Jaime Sánchez-Barriga and colleagues from HZB investigated for the first time whether the direction of motion of electrons in topological insulators affects their behavior. In their work they identified directions along which electrons are much more prone to scattering losses and cannot conduct as well. To explain their results, they included the spin of the electron and questioned an established theory. The results could push topological insulator research, especially when a future BESSY-VSR will be available to provide much shorter light pulses to study the dynamics of the electrons. Their investigation into the "warping" of topological insulators is published by Physical Review B and has been selected as "Editor's Suggestion". Only six percent of the articles  published there receive this sort of acclaim. [...].

  • <p>Logo der Jahrestagung FVEE 2014</p>11.11.2014

    Jahrestagung des ForschungsVerbund Erneuerbare Energien

    (german)

    Unter dem Motto „Forschung für die Energiewende – Phasenübergänge aktiv gestalten“ fand am 7. und 8. November die Jahrestagung des ForschungsVerbund Erneuerbare Energien (FVEE) im Umweltforum Berlin statt. Vertreter aus Wissenschaft und Politik referierten über den proaktiven Umgang mit den technologischen, ökonomischen sowie politisch-gesellschaftlichen Herausforderungen der Energiewende. [...].

  • <p>Exploded view drawing of the electrochemical flow cell for soft x-ray absorption and emission spectroscopy. The membrane (yellow) is coated with a metal, serving as working electrode (WE) and that also serves as a support for the solid sample. Counter (CE) and reference electrode (RE) are placed in the liquid chamber. Tubes are attached to allow fast and easy liquid exchange and to prevent radiation damage. Credit: HZB<br /><br /></p>05.11.2014

    New in situ cell for investigating solid- and liquid-state samples and their interfaces under electrical voltage

    A team headed by Dr. Kathrin Aziz-Lange has developed a new in-situ cell for X-ray spectroscopy of fluid samples and their interfaces to solid bodies. What is special is the cell contains electrodes that can expose the sample to voltage during or between measurements. The resulting changes triggered in the electrical structure of the sample can be observed with the help of X-ray absorption and emission spectroscopy in real time. [...].

  • <p>Optical image of a filled root.<br />Credit: P. Zaslansky</p>30.10.2014

    Root canal treatment procedures investigated at BESSY II

    Two scientists have examined several dozen dental roots at BESSY II, both before and after treatment and found that the mechanical procedures during treatment are rather not contributing to micro fractures.

    Root canal treatment is sometimes necessary to resolve severe infection, and often saves teeth from being extracted. The procedure involves drilling an opening through the crown in order to reach the inflamed pulp (infected soft tissue containing blood vessels and nerves). The pulp is removed, the root canals are enlarged and disinfected and the cleaned root canals are hermetically sealed prior to tooth reconstruction. [...].

  • <p>Das HZB beteiligt sich am Aufbau zweier Studieng&auml;nge an derT&uuml;rkisch-Deutschen Universit&auml;t in Istanbul. Bild: <a href="http://www.tau.edu.tr" class="Extern">www.tau.edu.tr</a></p>28.10.2014

    Deutsch-Türkische Universität am HZB zu Gast

    (german)

    Vizerektor und Dekan der Naturwissenschaftlichen Fakultät besuchte mehrere Institute des HZB

    Seit 2014 beteiligt sich das HZB gemeinsam mit der Universität Potsdam an der Konzeption und Einrichtung zweier Bachelor-Studiengänge am Fachbereich Materialwissenschaften und -technologien und hilft mit seiner Expertise beim Lab Design und beim Instrumentenaufbau an der Türkisch–Deutschen Universität in Istanbul.

    Nun besuchte der Dekan der Naturwissenschaftlichen Fakultät und Vizerektor der TDU Herr Prof. Öksüzoglu im Oktober das HZB. [...].

  • <p>Fotostrecke von Kevin Fuchs "MY BEAMLINE"</p>23.10.2014

    Impressionen der Fotoausstellung #achtens

    (german)

    Die Abschlussklasse 2014 der OSTKREUZSCHULE hat die Fotoausstellung im SEZ am 17.10.2014 erfolgreich eröffnet, rund 4.500 Besucher kamen zur Vernissage.

    [...].

  • <p>In january 2014, the HFM was just delivered to HZB.&nbsp; Credit: P. Dera/HZB</p>22.10.2014

    26 tesla! High field magnet exceeds everyone’s expectations

    It’s done! The high field magnet is consistently producing magnetic fields of approx. 26 tesla and staying at this value over extended periods of time. And all this in spite of the fact that 26 tesla exceeds the original 25-tesla goal; in other words, the magnet turns out to be even stronger than anyone had hoped for. On Thursday afternoon, October 16, 2014, Dr. Peter Smeibidl who heads the HFM’s team of eight was able to report on their success and thank everyone involved with setting up the complex high field magnet with its own cooling systems and 4-megawatt power supply.

    [...].

  • <p>HZB Freigeist Fellow: Dr. Annika Bande<br />Foto: Mirko Krenzel for VolkswagenStiftung</p>17.10.2014

    HZB Freigeist Fellow Dr. Annika Bande

    As of early October, the HZB is home to one of the Volkswagen Foundation's Freigeist Fellows: Dr. Annika Bande recently joined Prof. Dr. Emad Aziz' institute "Methods for Material Development". There she will build up her own junior research group with initially three PhD students. [...].

  • <p>The Adlershof Science Forum is encouraging exchange among scientists in Adlershof.<span class="Extern"></span></p>16.10.2014

    SAVE THE DATE: Adlershofer Science Forum on 11.11.2014 with Poster Session

    Please save the date to participate on 11. November 2014 at  „Adlershof Science Forum“ (AFF) of Humboldt-Universität zu Berlin and IGAFA. The event is meant to encourage exchange and communication between scientists working at Adlershof.

    Registration and the call for posters is open until 30.10.2014 here. The best poster will be rewarded with 500 Euro. We really want young scientists and students to attend the event ! Please encourage them to participate.


    [...].

  • <p>RIXS-spectroscopy is a powerful method to gain insights into molecular and electronic structures in complex samples, liquid or solid. HZB scientists now know even a bit better how to interpret the RIXS-spectra. Photo: HZB</p>14.10.2014

    New light on the "Split Peak" in x-ray (RIXS) spectra of Alcohols

    New study from Helmholtz-Zentrum Berlin in the journal "Structural Dynamics" makes sense of mysterious spectra, paving way for RIXS spectroscopy probe dynamic electronic structure of complex liquids and materials [...].

  • 09.10.2014

    Tailored Disorder: Priority Programme starts with Kick-off-Meeting

    [...].

  • <p>Kevin Fuchs took pictures of "futuristic experiments."</p>08.10.2014

    A Photographer`s Views of Research Facilities

    For his final exam, photography student Kevin Fuchs has taken pictures of the reseach facilities BESSY II and BER II and the scientists working there. Swiss born Fuchs now invides for a preview of his pictures and of the photographs of his fellow students on Oct.17 at 7 p.m. at SEZ Berlin, Landsberger Allee 77. The exhibition will be open from Oct. 18 to Oct. 26. [...].

  • 06.10.2014

    Open Access: Webinar for Helmholtz Ph.D. students

    As part of the international Open Access Week 2014, a series of events around the World will help canvass and inform about open access to knowledge.

    On October 20 and 24, 2014, the Helmholtz Open Science coordination office will be offering a webinar on open access foundations entitled „Science is open: an introduction to open access“ [...].

  • <p>WDR-Moderator Andr&eacute; Gatzke erkl&auml;rt mit Schaumk&uuml;ssen, was ein Vakuum ist.&nbsp;</p>03.10.2014

    "Sendung mit der Maus" berichtet vom BESSY-"Türöffner"-Tag

    (german)

    Die "Sendung mit der Maus" hat am 3. Oktober eine Reportage vom BESSY-"Türöffner"-Tag gesendet.  Reporter André Gatzke erklärte dabei, was ein Vakuum ist. [...].

  • 29.09.2014

    Tage der Forschung in Adlershof

    (german)

    Am 25. und 26. September fanden in Adlershof die jährlichen Tage der Forschung statt. Das HZB bot rund 90 Schülerinnen und Schülern in drei unterschiedlichen Programmpunkten einen Einblick in die Welt der Forschung. [...].

  • <p>At first, the various parts are carefully unloaded so that they can be lifted quickly into the building through the roof of the NEAT building's newest addition.</p> <p>Photo: Stefanie Kodalle</p>26.09.2014

    NEAT: The chamber from Spain - HZB future log's latest addition

    Since the HZB future log (#HZBzlog) went live in March of this year, there have been a total of 15 episodes on building and developing our future projects. The focus has been on three projects in particular: high field magnet (for a total of seven episodes), EMIL (five episodes), and BESSY-VSR (three episodes). Next, the NEAT project team is taking the #HZBzlog stage. [...].

  • 26.09.2014

    “Multi-spectra glasses” for scanning electron microscopy

    Reflection zone plates produced by HZB enable lighter elements in material samples to be precisely detected using scanning electron microscopy (SEM) by providing high resolution in the range of 50-1120 eV. [...].

  • 25.09.2014

    German Society for Materials Science awards publication with HZB scientist as co-author


    At its annual conference on September 22, 2014, the German Society for Materials Science (DGM), presented the Werner Köster Award for best publication. The work, whose authors include HZB scientist Dr. Michael Tovar and which has been published in the International Journal of Materials Research, examines the catalytic effect of vanadium pentoxide in propene synthesis from propane using spectroscopic, microscopic, and radiographic methods. [...].

  • <p>Bernd Rech will focus on renewable energy issues<strong>.<br /></strong></p>23.09.2014

    Bernd Rech boardmember of the "work group of energy"

    Prof. Bernd Rech will speak on recent findings in thin film silicon photovoltaik research at the autumn meeting of the energy work group of the Deutsche Physikalische Gesellschaft (DPG). Rech had been elected to the board of the work group earlier this year.  [...].

  • <p>Im ehemaligen Plenarsaal der Bundesregierung in Bonn finden die Vort&auml;ge statt.</p>23.09.2014

    Deutsche Tagung für Forschung mit Synchrotronstrahlung, Neutronen und Ionenstrahlen an Großgeräten in Bonn

    (german)

    Das HZB ist mit eigenem Stand, Vortrag und Postern präsent auf der Deutschen Tagung für Forschung mit Synchrotronstrahlung, Neutronen und Ionenstrahlen an Großgeräten (SNI). Die dreitägige Veranstaltung findet vom 21. bis 23.09. im ehemaligen Plenarsaal der Bundesregierung im heutigen World Conference Centers in Bonn statt. [...].

  • <p>Summerstudents after their visit of BESSY II. Credit: Klaus-Martin H&ouml;fer</p>15.09.2014

    Final spurt of Summer students blog

    A new blog features the experiences of HZB’s summer students in 2014. In total 24 students have come from Japan, Denmark, India, Spain, Greece, Russia or other countries. For 8 weeks, during August and September, they are working on a project in a science team at the HZB. They are young and motivated students, willing to sacrifice their summer holidays and to spend them in a lab instead! [...].

  • <p>Das Forschungsmagazin Sichtbar erscheint zweimal j&auml;hrlich.</p>10.09.2014

    Sichtbar: Das Forschungsmagazin aus dem HZB

    (german)

    Die neue Sichtbar ist erschienen. Mit Interviews, Berichten und Meldungen zeigt das Magazin, an welchen Fragen HZB-Forscherinnen und -Forscher arbeiten: Von neuen Solarzellen bis hin zu Mikrogelen, aus denen sich komplexe funktionale Materialien für medizinische Anwendungen komponieren lassen, zum Beispiel für eine effizientere Dialyse. [...].

  • <p>Outstanding researchers took part in the &ldquo;New Trends in Topological Insulators 2014&rdquo; - workshop.</p>01.09.2014

    Leading scientists on topological insulators met in Berlin

    From July 7-10, 150 researchers met in Berlin to discuss recent findings in the field of topological insulators.

    Topological insulators are a rather new form of quantum matter with an insulating bulk and a metallic surface created by topologically protected and spin polarized electronic states. [...].

  • 22.08.2014

    Proteins: New class of materials discovered

    German-Chinese research team gleans seminal insights into protein crystalline frameworks at HZB's BESSY II

    Scientists at the Helmholtz Center Berlin (HZB) along with researchers at China’s Fudan University have characterized a new class of materials called protein crystalline frameworks (PCFs). [...].

  • 11.08.2014

    Neuer „lichtblick“ online

    (german)

    Ein Denkmal im Ehrenhof der Humboldt-Universität erinnert seit kurzem an Lise Meitner – das erste Denkmal für eine Wissenschaftlerin in Deutschland überhaupt. Über die außergewöhnliche Physikerin und die Entstehung der Bronze berichten wir in der aktuellen Ausgabe der HZB-Mitarbeiterzeitung „lichtblick“, die jetzt auch online ist.  [...].

  • <p>Cryogenic TEM micrograph of gold nanoparticles (Au-NP) in DES-solvent. Sputtering duration 300 s. Red circles show the different domains of self-assembled Au-NPs. The inset shows an enlarged image of one particular domain of self-assembled Au-NPs.<br />Image: HU Berlin/HZB</p>04.08.2014

    Self-assembly of gold nanoparticles into small clusters

    Researchers at HZB in co-operation with Humboldt-Universität zu Berlin (HU, Berlin) have made an astonishing observation: they were investigating the formation of gold nanoparticles in a solvent and observed that the nanoparticles had not distributed themselves uniformly, but instead were self-assembled into small clusters. [...].

  • <p>Reconstructed energy-selective neutron tomography: Visualization of austenite and martensite distribution in torsion (two images to left) and tensile (image to the right) loading.<br />Picture:&nbsp; HZB/Wiley VCH</p>31.07.2014

    Neutron Tomography technique reveals phase fractions of crystalline materials in 3-Dimensions

    Researchers at Helmholtz-Zentrum Berlin (HZB) and The University of Tennessee Knoxville (UTK) developed a novel method, based on energy-selective neutron imaging for visualization of crystalline phase distributions within the bulk of metallic samples. [...].

  • 29.07.2014

    DFG-Präsident besucht BESSY II

    (german)

    Am 18. Juli besichtigte Prof. Dr. Peter Strohschneider den Kontrollraum von BESSY II und informierte sich über die Bedeutung der Synchrotronstrahlung für die Material- und Energieforschung. [...].

  • 28.07.2014

    BMBF-Staatsekretär Stefan Müller bei BESSY II zu Gast

    (german)

    Seit Dezember 2013 ist Stefan Müller Parlamentarischer Staatssekretär bei der Bundesministerin für Bildung und Forschung Prof. Dr. Johanna Wanka. Nun informierte sich Stefan Müller über die Forschung am BESSY II. Der Besuch fand am Mittwoch, den 16. Juli 2014 statt.

    [...].

  • <p>Sebastian Seiffert forscht am HZB-Institut "Weiche Materie und funktionale Materialien" und leitet auch an der Freien Universit&auml;t Berlin eine Arbeitsgruppe.</p>28.07.2014

    GDCh zeichnet Sebastian Seiffert aus

    (german)

    Prof. Dr. Sebastian Seiffert erhält eine weitere Auszeichnung für seine Forschungsarbeit. Die Gesellschaft Deutscher Chemiker (GDCh) hat mitgeteilt, dass Seiffert den Preis für Nachwuchswissenschaftler auf dem Gebiet der Makromolekularen Chemie erhalten wird. Der Preis wird ihm im Rahmen der Konferenz "Polymers and Energy" überreicht, die vom 14. bis 16. September in Jena stattfindet. [...].

  • <p>Prof. Dr. Leone Spiccia will spent research time at HZB next spring.</p>01.07.2014

    Australian top-chemist gains Helmholtz International Fellowship to visit HZB and HZDR

    Prof. Dr. Leone Spiccia from the Monash University Melbourne was awarded the Helmholtz International Fellowship. In addition to the prize money of €20,000 each, he is invited to conduct research at HZB in Berlin and HZDR in Dresden. At HZB he is expected in spring 2015 in the group of Prof. Dr. Emad Aziz. The award honours excellent research and supports establishing new cooperation structures with international research institutions. [...].

  • <p>Ammonium tungstate/PSS film surface:&nbsp; (a) SEM picture before pyrolysis; (b &amp; c) SEM picture after pyrolysis. credit:EMPA</p>01.07.2014

    Collecting light with artificial moth eyes

    Scientists at EMPA in Zürich and University of Basel have developed a photoelectrochemical cell, recreating a moth’s eye to drastically increase its light collecting efficiency. The cell is made of cheap raw materials – iron and tungsten oxide. Analyses at BESSY II have revealed which chemical processes are useful to facilitate the absorption of light. [...].

  • <p>SEM image of the membrane. Credit: MPIKGF</p>01.07.2014

    “Muscled skin”: Simple formulas describe complex behaviors

    HZB researchers help chemists understand polymeric "biomimetic" materials' mechanical properties

    Sea cucumbers change the stiffness of their skin, Venus flytraps roll up their leaves and even pine cones are capable of closing up their scales. In the course of evolution, Nature has managed to give rise to complex materials capable of responding to external stimuli by way of mechanical movement. Which is exactly what chemists are now trying to do as well - and with considerable success! Dr. Jiayin Yuan's team at the MPI of Colloids and Interfaces in Golm, Germany, recently scored a particularly exciting breakthrough. The researchers managed to synthesize a membrane capable of rolling up extremely rapidly when exposed to fumes.
    Now, Prof. Dr. Joe Dzubiella, a theoretical physicist at the HZB, has managed to identify those factors that are responsible for the high speed. [...].

  • 26.06.2014

    Invitation: Reception Final Assembly of HFM

    Six years full of hard work with planning and constructing the High-Field Magnet (HFM) for Helmholtz-Zentrum Berlin we are proud to inform you that the final assembly is now complete.

    Before further test are going to start and the neutron beamline will be connected, we like to invite you to a reception at the lecture hall at the Helmholtz-Zentrum Berlin Wannsee on Thursday, July 10th at 11 am. [...].

  • <p>When inserting an ultrathin dielectric between metal electrode and organic semiconductor, charge carriers (shown here for a positively charged holes in red) are, counter intuitively, more efficiently extracted from their transport level (blue) in the organic to the Fermi level (black) in the metal than without the interlayer. Image: M Oehzelt/HZB</p>18.06.2014

    Electrostatics do the trick

    A simple model describes what happens between organic semiconductors and metals

    Organic semiconductors allow for flexible displays (OLEDs), solar cells (OPVCs), and other interesting applications. One common problem in these devices, however, is the interface between the metallic contacts and the organic semiconductor material, where undesirable losses occur. Now Dr. Martin Oehzelt has shown what these losses between the metal and the organic semiconductors depend upon and how to minimize them. In particular, his model also explains why a thin, electrically insulating layer between the two materials can even facilitate the transition of charge carriers. His results have recently been published in  Nature Communications. [...].

  • <p>These scanning electron micrographs show how accurately the three Fresnel zone plates were positioned above one another. 3D X-ray optics of this kind allow the resolutions and optical intensities to be considerably improved.<br />Image: S. Werner/HZB</p>18.06.2014

    Sharper imaging using X-rays

    HZB team develops three-dimensional volume diffraction optics for X-rays

    Physicists at HZB have developed a process to generate improved lenses for X-ray microscopy that provide both better resolution and higher throughput.  To accomplish this, they fabricate three-dimensional X-ray optics for volume diffraction that consist of on-chip stacked Fresnel zone plates. These three-dimensional nanostructures focus the incident X-rays much more efficiently and enable improved spatial resolution below ten nanometres. [...].

  • <p>The graduate students Jens V&ouml;ker and Christoph Kunert received a IPAC grant and presented their work on a student poster sesson.</p>16.06.2014

    1200 accelerator physicists from around the world meet in Dresden

    The world’s largest particle accelerator conference is being held in Germany for the first time, with around 1200 scientists expected to visit the Saxon capital Dresden from 15 to 20 June. The 5th international conference IPAC is the place for experts to share the advancements they have made in developing particle accelerators and their components. [...].

  • 03.06.2014

    Matthias May receives the Poster Prize at the Wilhelm und Else-Heraeus Seminar

    Matthias May, PhD student at the HZB Institute for Solar Fuels, was awarded a Poster Prize at the 562nd WE Heraeus Seminar “From Sunlight to Fuels” for his scientific work. From 11 to 16 May 2014, the participants of the WE Heraeus seminar concentrated intensively on the topic of “converting sunlight to hydrogen” and discussed new materials and processes for photovoltaic and (photo)catalytic applications. [...].

  • <p>Some contemporary Synchroton Radiation methods need pulsed x-rays with a specific time structure. HZB-users at BESSY II can use them now on demand. Graphics: Highway at night, K. Holldack/HZB</p> <p></p>30.05.2014

    X-ray pulses on demand from Electron Storage Rings

    New pulse picking method enables time-of-flight electron spectroscopy in normal mode

    HZB physicists recently devised a new method to pick single x-ray pulses out of the pulse trains usually emitted from synchrotron radiation facilities. The technique is very useful to support studies of electronic properties of quantum materials and superconductors and paves the way for future synchrotron facilities with variable pulse lengths. [...].

  • <p>Prof. Dr. Emad Aziz is a professor at Freie Universit&auml;t Berlin and head of a research group at HZB. At the Bunsen-Tagung Dr. Peter Goelitz, Chief Editor of "Angewandte Chemie" congratulates him. Photo: E. Wille</p>30.05.2014

    Emad Aziz receives Nernst-Haber-Bodenstein-Award

    On 29. May 2014, the German Bunsen Society for Physical Chemistry has honored Prof. Dr. Emad Flear Aziz with the Nernst-Haber-Bodenstein-Award. Aziz is leading research teams at HZB and „Freie Universität Berlin“,  where he has built up the Joint Ultrafast Dynamics Lab in Solutions and at Interfaces. [...].

  • <p>Im Mittelpunkt der Ausstellung steht die Gipsfigur der Lise Meitner, die Grundlage f&uuml;r die Bronze-Skulptur des Denkmals ist. Die Skulptur wird auf einem &uuml;bergro&szlig;en, symboltr&auml;chtigen Sockel im Ehrenhof der Humboldt-Universit&auml;t zu Berlin stehen.</p>26.05.2014

    Modelle und mehr. Eine Ausstellung mit Werken von Anna Franziska Schwarzbach, Preisträgerin des Kunstwettbewerbes zum Lise-Meitner-Denkmal

    (german)

    Vom 19.05. bis 20.06.2014, im Lichthof der Humboldt-Universität Unter den Linden 6, Eintritt frei

    Am 10. Juli wird das Lise-Meitner-Denkmal, das erste Denkmal für eine Wissenschaftlerin in Deutschland, feierlich an der Humboldt-Universität eingeweiht. Im Vorfeld findet im Lichthof der HU eine Ausstellung mit Werken der Preisträgerin, der vielfach ausgezeichneten Berliner Künstlerin Anna Franziska Schwarzbach, statt. Ihr Entwurf hatte sich bei dem Kunstwettbewerb zum Lise-Meitner-Denkmal gegen mehrere hochrangige Beiträge durchgesetzt.  Neben verschiedenen Arbeitsmodellen zum Lise-Meitner-Denkmal geben Porträts, Büsten, Medaillen und Graphiken Einblick in das außergewöhnliche Wirken Anna Franziska Schwarzbachs. [...].

  • <p>Die drei Vertreterinnen des&nbsp;<a href="http://hzbzlog.com/" class="Extern"> #HZBzlog</a> Sibylle Grunze, Ina Helms und Antonia R&ouml;tger (v.l.)</p>22.05.2014

    #HZBzlog gewinnt Deutschen Preis für Onlinekommunikation als beste Microsite

    (german)

    Seit etwa vier Monaten ist das HZB-Zukunftslogbuch #HZBzlog mit seiner ungewöhnlichen Episodenstruktur online, und es findet immer mehr Fans. Die als Langzeitdokumentation angelegte Seite öffnet ein Fenster in die Forschung und gibt den Blick frei auf die Geschichten hinter den Kulissen. Täglich surfen zwischen 500 und 1.000 Menschen auf der Seite und warten gespannt auf neue lebendige Einträge rund um die großen Zukunftsprojekte am HZB. Vier Monate nach dem Start gewinnt das neue HZB-Portal nun den von der Deutschen Presseakademie herausgegebenen "Deutschen Preis für Onlinekommunikation" und ist auf dem besten Weg, ein Erfolg zu werden. [...].

  • <p><a href="/media/media/aktuell/print//lichtblick/76/hzb_lichtblick_mai-2014_extern_web.pdf" class="Extern"><span class="Intern">Lichtblick zum Download</span></a></p>20.05.2014

    Neuer Lichtblick erschienen

    (german)

    Am Campus Wannsee entstehen neue Labore für die Materialsynthese: In unserer Mitarbeiterzeitung "lichtblick" berichten wir erstmals über das neue Bauvorhaben, das Materialforscherinnen und -forscher anlocken soll. Die Labore werden benötigt, um erfolgreich neuartige Materialkonzepte für die Energieumwandlung und -speicherung zu charakterisieren. Um ein wichtiges Zukunftsthema dreht sich auch unsere Titelgeschichte. [...].

  • <p>In den Pausen tauschten sich die Teilnehmer angeregt &uuml;ber die Vortr&auml;ge und ihre eigenen Forschungsarbeiten aus. Foto: FAU&nbsp;</p>15.05.2014

    Das ganze Spektrum der Elektrokatalyse an einem Tag

    (german)

    Am 4. April 2014 lud das Helmholtz-Institut Erlangen-Nürnberg (HI ERN) zu seiner ersten wissenschaftlichen Veranstaltung ein. Beim internationalen Symposium „Recent Achievements and Future Trends in Electrocatalysis“ präsentierten zehn führende Wissenschaftler auf dem Gebiet der “Elektrokatalyse” von hochrangigen nationalen und internationalen Forschungsstätten den rund 90 Teilnehmern ihre Forschungsarbeiten. [...].

  • 14.05.2014

    Prof. Dr. Silke Christiansen receives a distinguished visiting professorship at South Korean Chonbuk National University

    The president of Chonbuk National University, Suh Geo-Suk, has appointed Prof. Dr. Silke Christiansen “Distinguished visiting Professor” for three years in recognition of her extraordinary services in the field of renewable energies. Christiansen received the certificate of appointment at a ceremony in May together with two other outstanding foreign scientists. As a “Distinguished visiting Professor” at the Faculty of Semiconductor Physics and Chemistry, Silke Christiansen will be promoting the scientific contact between Helmholtz-Zentrum Berlin (HZB), Freie Universität Berlin (FU) and the Korean university. [...].

  • <p>Der Hochfeldmagnet am Helmholtz-Zentrum Berlin. Mit 25 Tesla liefert er weltweit das st&auml;rkste Magnetfeld im Zusammenhang mit Neutronenstreuexperimenten.<br />Foto: HZB</p>13.05.2014

    Internationale Gutachter loben Helmholtz-Zentrum Berlin

    (german)

    Strategie des HZB für BER II und BESSY II und Planungen für die Restlaufzeit des Forschungsreaktors positiv bewertet  -  Betrieb ruht wegen aktueller Wartungsarbeiten

    Ein 16-köpfiges Team internationaler Experten unter Leitung von Prof. William Stirling, Direktor des renommierten Institut Laue Langevin (ILL) in Grenoble hat in einem mehrere Monate dauernden Begutachtungsprozess die Großforschungsanlagen am Helmholtz-Zentrum Berlin (HZB) unter die Lupe genommen. Für die HZB-Geschäftsführung gibt es ein erstes sehr positives Feedback.
    [...].

  • <p><strong>Was passiert mit Schokok&uuml;ssen im Vakuum?</strong> Die beiden Jungen haben es zur Langen Nacht ausprobiert und einiges &uuml;ber das "Nichts" gelernt.</p> <p></p>12.05.2014

    3.800 Menschen besuchten das HZB zur Langen Nacht der Wissenschaften

    (german)

    „Schau rein, schlau raus“ – das Motto der diesjährigen Langen Nacht der Wissenschaften dürfte sich für die Besucher am Helmholtz-Zentrum Berlin mehr als erfüllt haben. 2.200 Mal öffneten sich am Samstag, dem 10. Mai die Türen des Elektronenspeicherrings BESSY II, der in Adlershof zur Entdeckungsreise einlud. Am benachbarten Institut für Silizium-Photovoltaik des Helmholtz-Zentrum Berlin informierten sich etwa 1.600 Menschen über die Energie der Zukunft, hörten Vorträge und besichtigten die Labore der Forscherinnen und Forscher. [...].

  • <p>Picture: The sample consisted of one layer of WSe<sub>2</sub> (orange) on top of MoS<sub>2</sub> (blue). The SPEEM-microscopy reveals coupling between both layers and charge transfer. credit: F. Kronast/HZB</p>09.05.2014

    Energy efficient LEDs and lasers with Chalcogenide monolayers

    As reported by nanotechweb.org, monolayers of certain chalcogenides might be used to make energy-efficient nano-optoelectronics devices, such as LEDs, lasers, solar cells, and high-electron-mobility transistors. Scientists of the University of California at Berkeley, the Lawrence Berkeley National Lab and the Helmholtz-Zentrum Berlin für Materialien und Energie in Berlin investigated the electronic and optoelectronic properties of a so called heterojunction of WSe2/MoS2. [...].

  • <p>The optical properties of a material depend also on its nanostructure. Picture: Hans Bernhard/Wikipedia// CC</p>09.05.2014

    Tailored disorder for optical applications

    HZB’s Silke Christiansen coordinates new DFG priority program 

    Over the next six years, the German Research Foundation (DFG) is planning on setting up 16 new priority programs. One of these programs is the "Tailored Disorder" priority program, which will be coordinated by Prof. Dr. Ing. Silke Christiansen (HZB, FU Berlin, Max Planck Institute for the Science of Light). Starting in 2015, research groups that are part of the program will be investigating new kinds of optical technologies based on tailored disorder. Between 2015 and, foreseeably, 2021, the "Tailored Disorder" priority program will receive DFG funding in the amount of approx. 12 million Euros. [...].

  • <p>alle Fotos: (c) HZB</p>06.05.2014

    Lange Nacht der Wissenschaften - 10. Mai, 17 bis 0 Uhr: Besichtigen Sie den Elektronenspeicherring BESSY II und die Labore der Solarenergie

    (german)

    Der Countdown läuft. Nur noch wenige Tage sind es, bis wir die Türen für Sie zur Langen Nacht der Wissenschaften öffnen. Hinter den Kulissen ist schon viel los, bis es am Samstag, dem 10. Mai ab 17 Uhr richtig ernst wird: Unsere Forscherinnen und Forscher sind gerade dabei, spannende Mitmach-Experimente und informative Stationen vorzubereiten. Wir freuen uns, wenn Sie zur „klügsten Nacht des Jahres“ vorbeikommen und nicht nur neues Wissen, sondern auch einige „Aha-Erlebnisse“ mitnehmen. Ein Highlight ist auch in diesem Jahr der Rundgang durch die große Experimentierhalle von BESSY II in Berlin-Adlershof. [...].

  • <p>Intensity distribution of XUV light in the slit plane. Credit: HZB/FU</p>29.04.2014

    New tool for Joint Lab to investigate the chemistry of nature

    The Aziz’ team at the Joint Laboratory between Freie Universität Berlin and HZB has built a laser-based tabletop setup which generates ultrashort XUV light pulses and achieves their monochromatization by implementing special reflection zone plates, developed and produced by the team of Alexei Erko. [...].

  • <p>Crystal structure of human MTH1 in complex with a key inhibitor.<br />Source: Stockholm University, Prof. Pal Stenmark.</p>08.04.2014

    A new concept for the treatment of cancer

    A team of researchers from five Swedish universities has identified a new way to treat cancer. They present their concept in the journal „Nature“. It is based on inhibiting a specific enzyme called MTH1. Cancer cells, unlike normal cells, need MTH1 to survive. Without this enzyme, oxidized nucleotides are incorporated into DNA, resulting in lethal DNA double-strand breaks in the cancer cells. The research group at Stockholm University has determined the structure of MTH1 based on diffraction measurements at HZB´s MX-beamline at BESSY II. These detailed structural studies are important for the development of efficient inhibitors targeting MTH1.


    DOI: 10.1038/nature13181. http://dx.doi.org/10.1038/nature13181.

    Doi: 10.1038/nature13194. http://dx.doi.org/10.1038/nature13194 [...].

  • <p><span>Das HZB pr&auml;sentiert auf der Hannover Messe Themen aus dem Bereich Energieforschung auf dem Gemeinschaftsstand "</span><span><span>Energy Research".</span></span></p>07.04.2014

    Das HZB auf der Hannover Messe

    (german)

    Die Hannover Messe, die weltweit größte Industriemesse, wurde heute eröffnet. Das HZB ist als Aussteller auf dem Themenstand »Energy Research« in der Halle 2 Stand C.62 vertreten. Die Themenschwerpunkte in der Halle "Research & Technology" sind u.a. Energieeffizienz, Erneuerbare Energien, Energiespeicherung, Energieverteilung/Smart Grids, Ressourcenmanagement und Elektromobilität. [...].

  • <p>The topography of the sample surface can be seen here (white lines around the nano-particles) as well as the local optical excitations. The image displays several &ldquo;hot spots&rdquo; (yellow) that arise through interactions of the nanoparticles with the light and also with one another.<br />Image: HZB/CalTech</p>07.04.2014

    Even thinner solar cells through use of nanoparticles

    Nanostructures could enable more light to be directed into the active layer of solar cells, increasing their efficiency. Prof. Martina Schmid (HZB und Freie Univ. Berlin) has now measured how irregularly distributed silver particles influence the absorption of light. She demonstrated that nanoparticles interact with one another via their electromagnetic near-fields, so that local “hot spots” arise where light is concentrated especially strongly. [...].

  • <p>Advanced analytics for both thin film technologies with silicon as well as CIGS: Beside highly developed deposition tools, a comprehensive infrastructure was set up at PVcomB. Here, a glass substrate is loaded into a multi-chamber deposition tool where it will be deposited with only a few micrometers of silicon layers forming finally the active part a solar cell.</p> <p>Foto: Berlin Partner f&uuml;r Wirtschaft und Technologie / Monique W&uuml;stenhagen</p>02.04.2014

    New Thin Film Photovoltaic World Record announced on Conference in Berlin

    The 5th International Workshop on CIGS Solar Cell Technology organized bei Helmholtz-Zentrum Berlin (HZB) started with a bang. Katsumi Kushiya by the Japanese company Solar Frontier presented the approximately 100 participants a new world record conversion efficiency for thin-film-photovoltaic technologies. Their new thin-film CIGS cells can convert 20.9 percent of the incident sunlight into electrical energy beating the previous Solar Frontier- record of 19.7 percent conversion efficiency. The previous best value for all thin-film photovoltaic technologies was 20.8 percent. [...].

  • <p>Roel van de Krol, head of the HZB Institute for Solar Fuels, coordinates the global research project PECDEMO.Photo: P.Dera/HZB</p>31.03.2014

    PECDEMO: sunlight to hydrogen

    Within just three years, research partners of the EU project PECDEMO are planning on developing a practical system capable of converting over eight percent of solar energy into hydrogen. This could prove a real breakthrough in terms of practical applicability. Roel van de Krol, head of the HZB Institute for Solar Fuels, coordinates this global research project. [...].

  • <p></p> <p></p>28.03.2014

    Nearly 100 girls visited HZB for Girls' Day

    Nearly 100 girls visited HZB for Girls' Day. Dr. Michael Tovar and Dr. Ulrike Witte, both from the school lab of HZB had organised 16 workshops for the girls, where they could meet female scientists, engineers and technicians and do Hands On science experiments.

    [...].

  • <p>The picture shows the characteristic spin texture (arrows) in a topological insulator (bottom) and how it is either probed by circularly polarized light (top) or manipulated by it (middle). Picture: Rader/Sachez-Barriga/HZB</p>27.03.2014

    Controlling electron spins by light

    Researchers of HZB manipulate the electron spin at the surface of topological insulators systematically by light

    Topological insulators are considered a very promising material class for the development of future electronic devices. A research team at Helmholtz-Zentrum Berlin (HZB) has discovered, how light can be used to alter the physical properties of the electrons in these materials. Their results have just been published by the renowned journal "Physical Review X". [...].

  • <p>12 Kinder und Jugendliche besichtigen die Betriebsfeuerwehr des Helmholtz-Zentrum Berlin / Fotos: John Schneider</p>20.03.2014

    Ausgerückt: Jugendfeuerwehr Berlin-Zehlendorf besucht Wache 4508

    (german)

    Übungen gehören zum Pflichtprogramm der Jugendfeuerwehr Berlin-Zehlendorf. Doch am 17. März erwartete die Jugendlichen zunächst eine etwas längere Fahrt im Einsatzfahrzeug: Sie besuchten die Werksfeuerwehr am Helmholtz-Zentrum Berlin - oder wie es bei der Berliner Feuerwehr kurz heißt: die Wache 4508. Gegen 18.30 Uhr trafen 10 Jungen und 2 Mädchen an der Pforte ein, um die Besonderheiten der Betriebsfeuerwehr kennenzulernen. [...].

  • 19.03.2014

    The International Summer School Quantsol will inform on basics in photovoltaics and solar energy conversion

    Registration now open! For the seventh time already young solar energy researchers are invited to attend the International Summer School on Photovoltaics and New Concepts of Quantum Solar Energy Conversion (Quantsol). The school will be held from September 7th to 14th, 2014 in Hirschegg, Kleinwalsertal, Austria. The school is organized by the Helmholtz-Zentrum Berlin together with the Technical University of Ilmenau. Application can be submitted through the school’s homepage until June 1st, 2014. [...].

  • 17.03.2014

    Autumn School on Microstructural Characterization and Modelling of Thin Film Solar Cells

    From November 2 ‐ 7, 2014, an Autumn school is organised as part of the Helmholtz Virtual Institute Microstructure Control for Thin‐Film Solar Cells. The event addresses young scientists, who are interested in thin film photovoltaic research. The autumn school will take place at the Resort Hotel Schwielowsee near Potsdam, Germany. Deadline for applications: May 31, 2014

    [...].

  • <p>Kristalle in ihrer ganzen Sch&ouml;nheit, Form und Farbenvielfalt faszinieren die Gelehrten seit der Antike. Das Internationale Jahr der Kristallographie macht auf die erzielten Fortschritte in allen Lebensbereichen aufmerksam.</p>17.03.2014

    Kristalle in Wissenschaft und Technik: Ergebnisse auf der 22. Jahrestagung der Deutschen Gesellschaft für Kristallographie in Berlin

    (german)

    Die Kristallographie hat enorm zum Fortschritt des 20. und 21. Jahrhundert beigetragen und ein grundlegendes Verständnis von Prozessen in vielen Lebensbereichen ermöglicht. Die Vielfalt der interdisziplinären Wissenschaft zu Struktur und Eigenschaften von Kristallen, ihrer Synthese und Anwendungsmöglichkeiten wird vom 17. bis 20. März 2014 bei der 22. Jahrestagung der Deutschen Gesellschaft für Kristallographie (DGK) in Berlin präsentiert. [...].

  • <p>The original structure of the material has an ABCABC arrangement of oxygen layers (left) &ndash; Due to the Li+H+ exchange during the charging process it degrades to ABBCCA (right).</p>17.03.2014

    Why do Li-ion batteries age?

    Even the best Li-ion batteries degrade with time. A reason for this was now identified by researchers at HZB. They could directly observe at BESSY II and DORIS atomic rearrangements occurring in the cathode material of Li-ion batteries during charge and discharge processes. Such repetitive changes in atomic arrangements can lead to the breakdown of the crystal structure of a material and are the major causes of “ageing” of Li-ion batteries during cycling. [...].

  • <p>Foto: rbb/screenshot</p>13.03.2014

    Starfotograf Thomas Struth zeigt in seiner aktueller Ausstellung Fotos von BESSY II

    (german)

    Nicht nur die Queen und zahlreiche andere Prominente hat Thomas Struth abgelichtet. Der Fotograf, der heute selbst als Star gefeiert wird, hat auch Bilder von BESSY II inszeniert. Dabei hat ihn die Frage geleitet, wie Orte aussehen, wo Menschen an der Zukunft arbeiten. Die neuen Aufnahmen von Thomas Struth sind noch bis zum 19. April in der Galerie Max Hetzler Berlin ausgestellt, darunter auch zwei Aufnahmen vom Elektronenspeicherring BESSY II. [...].

  • <p>Top ranking tertiary graduates are in demand (f.e. for the <a href="/angebote/jobskarriere/promotion/index_en.html">MatSEC</a> graduate school.) Now graduates can apply for a grant to cover the &ldquo;pre-track&rdquo; period between their master&rsquo;s degree and acceptance into their doctoral programme.</p>10.03.2014

    Gaining the best graduates – HZB supports the pre-track phase up to commencement of the PhD programme

    Top ranking tertiary graduates are in demand. As incentive to continue on to a PhD programme at HZB, HZB has made its conditions more attractive than ever. As of now, graduates can apply for a grant to cover the “pre-track” period between their master’s degree and acceptance into their doctoral programme. That gives them greater freedom to organize the formalities before commencing their doctorate. [...].

  • <p><em>ISU<sup>energy</sup></em> participants experimenting during a practical.</p>06.03.2014

    International Summer University on Renewable Energies: Registration now open

    On behalf of the ISUenergy Scientific & Organising Committee it is a great pleasure to announce the 6th International Summer University on Renewable Energies and to invite your applications for this year's ISUenergy . It will take place from Aug. 24th - Sept. 5th in Falera, Switzerland. Registration for ISUenergy is open now. [...].

  • <p>Prof. Dr. Roland Winter and award winner Dr. Sebastian Seiffert. Photo: GDCh.</p>03.03.2014

    ADUC Prize for Sebastian Seiffert


    The Working Group of German University Chemistry Professors (ADUC/Arbeitsgemeinschaft Deutscher Universitätsprofessoren und –Professorinnen für Chemie) has awarded its 2013 prize for instructors completing their professorial credentials to Dr. habil. Sebastian Seiffert. Seiffert heads a group of junior scientists at the HZB Institute for Soft Matter and Functional Materials, as well as teaching at the Freie Universität Berlin as an adjunct professor. He will be assuming an associate professorship for supramolecular polymeric materials beginning in April that will be jointly financed by HZB and the Freie Universität Berlin. [...].

  • <p>The picture shows the characteristic spin texture (arrows) in a topological insulator and how it is manipulated by circularly polarized light.<em>Picture: Rader/Sachez-Barriga/HZB</em></p>25.02.2014

    How to use light to manipulate the spin in topological insulators

    Researchers at HZB investigated the topological insulator bismuth selenide (Bi2Se3) by spin-resolved photoelectron spectroscopy at BESSY II. They found an astonishing difference depending on whether it is illuminated by circularly polarized light in the vacuum ultraviolet (50 electron volts, eV) and in the ultraviolet spectral range (6 eV). This result could help explaining how spin currents can be generated in topological insulators. [...].

  • <p>A cluster tool for the research on new classes of materials and device structures for photovoltaic and photocatalysis applications. (Source: Altatech)</p>21.02.2014

    A new cluster tool for EMIL

    Helmholtz-Zentrum Berlin für Materialien und Energie (HZB) and Altatech, a subsidiary of Soitec, have launched a collaborative partnership to research and develop materials for the next generation of high-efficiency solar cells, including new classes of materials and innovative device structures for photovoltaic and photocatalysis applications. [...].

  • 21.02.2014

    Helmholtz-Zentrum Berlin funds three-month stay abroad during PhD

    Anyone looking at a career in science will hear soon enough: Spending time abroad is extremely useful for international networking with peers. It is not always easy to go abroad within the three-year doctorate period. And, until now, it has been even harder to finance the desired stay abroad. Now there is a new programme that supports young researchers on their projects and makes doing a PhD at HZB much more attractive: the PhD Student Research Abroad. Up to five PhD students can be funded each year. The pilot project starts in March 2014. [...].

  • <p></p> <p></p>20.02.2014

    HZB-Zeitung "Lichtblick" erschienen

    (german)

    Viele Menschen, die in einem Forschungszentrum arbeiten, bleiben unsichtbar. Sie sind Dienstleister für die Wissenschaftlerinnen und Wissenschaftler – oder machen, wie der Strahlenschutzexperte, Dr. Guido Buchert, das Forschen an den Großgeräten erst möglich. In dieser Ausgabe stellen wir seinen Berufsweg und sein höchst verantwortungsvolles Aufgabengebiet vor. [...].

  • 19.02.2014

    Graffiti im Hörsaal: Die Künstler Gerrit Peters und Heiko Zahlmann gestalten Vortragsraum neu

    (german)

    Ein leuchtendes Gelb, eine riesige Welle und starke Lichtpulse. Das Wandbild, das die Graffiti-Künstler von getting up, Gerrit Peters und Heiko Zahlmann, im Hörsaal am Standort Wannsee gemalt haben, ist eine Aufforderung zum Betrachten und Entdecken. In ihrem Entwurf haben die beiden Künstler Forschungsthemen aus dem HZB aufgegriffen und abstrahiert. [...].

  • <p>In the initial state (left), the voids' internal surfaces are saturated with hydrogen atoms so that no defects are observed. Light-induced charge carriers (h<sup>+</sup>) destabilize atomic bonds. The breaking of atomic bonds causes defects (indicated by the vertical arrows on the right hand side), which translates to reduced solar cell efficiency.</p>13.02.2014

    Light-induced degradation in amorphous silicon thin film solar cells

    Researchers at the Helmholtz Center Berlin (HZB) have taken a leap forward towards a deeper understanding of an undesired effect in thin film solar cells based on amorphous silicon – one that has puzzled the scientific community for the last 40 years. The researchers were able to demonstrate that tiny voids within the silicon network are partly responsible for reducing solar cell efficiency by some 10 to 15 percent as soon as you start using them. Their work has now been published in Physical Review Letters (DOI: 10.1103/PhysRevLett.112.066403). [...].

  • 07.02.2014

    Am 13. Februar 2014 treten drei Nachwuchsforscher beim Dissertationspreis Adlershof gegeneinander an

    (german)

    Auch in diesem Jahr ist für den Dissertationspreis Adlershof eine Nachwuchsforscherin nominiert, die am Helmholtz-Zentrum Berlin promoviert hat. Dr. Nicole Welsch untersuchte bei Prof. Dr. Matthias Ballauf (HZB), wie Proteine auf neutralen sowie geladenen, kolloidalen Mikrogelen adsorbiert werden. Seit 2002 wird der Dissertationspreis Adlershof jährlich von der Humboldt-Universität zu Berlin, der Initiativgemeinschaft Außeruniversitärer Forschungseinrichtungen in Adlershof e.V. (IGAFA) und der WISTA-MANAGEMENT GMBH verliehen. [...].

  • 30.01.2014

    #HZBzlog – the new series highlight – is now online. Don’t miss an episode!

    Television is not the only source for exciting stories told episode by episode. The Internet is suited more than ever. The first project of this kind is not a thriller or your daily soap opera, but comes instead from the world of science. Presented in HZB Future Logbook (#HZBzlog) that was broadcast today at 02:00 p.m. [...].

  • <p>Eine 30-k&ouml;pfige Delegation besuchte im Rahmen des Deutsch-T&uuml;rkischen Wissenschaftsjahres BESSY II und weitere Forschungseinrichtungen in Adlershof.</p>30.01.2014

    Türkischer Minister für Wissenschaft besuchte Adlershof und BESSY II

    (german)

    Der türkische Wissenschaftsminister Fikri Isik war in Berlin eingeflogen, um gemeinsam mit der Bundesforschungsministerin Johanna Wanka, am 23. Januar das deutsch-türkische Wissenschaftsjahr 2014 feierlich zu eröffnen. Im Rahmen seines Besuchs besichtigte eine 30-köpfige Delegation um Fikri Isik Forschungseinrichtungen in Adlershof und machte dabei auch an BESSY II Station.  [...].

  • 29.01.2014

    The HZB online presence got a new look

    The HZB’s online presence just got a new look. But it isn’t only the design that has been completely reworked – the new site also offers a host of exciting new features. For one, the site is now mobile-optimized. Also, we have made a real effort to improve site navigation: research sites have been broken down by topic to afford users a much improved quick look topics overview. Movies, images, and podcasts about our research can be accessed via the new media library. We hope you will enjoy surfing our new website as much as we’ve enjoyed creating it! [...].

  • 27.01.2014

    Magnetic switch gets closer to application

    Scientists from Paris, Newcastle and Helmholtz-Zentrum Berlin have been able to switch on and off robust ferromagnetism close to room temperature by using low electric fields. Their results are inspiring for future applications in low-power spintronics, for instance in fast, efficient and nonvolatile data storage technologies.

    The sample consisted of a ferroelectric BaTiO3 substrate covered with a thin film of magnetic FeRh.  Experiments at BESSY II combined with other measurement methods demonstrated how the magnetic order of the sample changes dramatically, when a moderate external electric field is applied: The electric field induces strain in the crystal structure of the ferroelectric substrate, which is transferred to the thin FeRh-film and switches its magnetic ordering from ferromagnetic (large magnetization) to antiferromagnetic (zero magnetization). The effect is ten times larger than previously observed in other magnetic structures and especially promising since it is found close to room temperature. The results have been published online on 26 January in Nature Materials, DOI: 10.1038/NMAT3870. [...].

  • <p><span><span>Despite the onset of winter, the High-Field Magnet arrived in Berlin without difficulty. The magnet will be connected to the cooling facility, power supply, and the neutron guide over the next months. Photo: </span><span>HZB/Phil Dera</span></span></p>23.01.2014

    High-Field Magnet crossed the finish line at Helmholtz-Zentrum Berlin

    The High-Field Magnet (HFM) for diffracting neutrons entered the gates of the Helmholtz-Zentrum Berlin in Wannsee on 23 January 2014 at 9am, where the project team headed by Dr. Peter Smeibidl enthusiastically accepted delivery. The journey for the roughly 20-tonne scientific device began in the Italian city of Chivasso near Turin two days prior on 21 January. It traversed its 1200 kilometre route without incident, which led through Milan, the Gotthard Tunnel, Zürich, and Stuttgart to Berlin. [...].

  • <p>The transformation from a layer of closely packed nanorods (top left) to a polycrystalline semiconductor thin film (top right) can be observed in by in-situ X-ray diffraction in real time. The intensities of the diffraction signals are color coded in the image at the bottom. A detailed analysis of the signals reveals that the transformation of the nanorods into kesterite crystals takes only 9 to 18 seconds.</p> <p>Picture: R. Mainz/A. Singh</p>22.01.2014

    From a carpet of nanorods to a thin film solar cell absorber within a few seconds

    Research teams at the HZB and at the University of Limerick, Ireland, have discovered a novel solid state reaction which lets kesterite grains grow within a few seconds and at relatively low temperatures. For this reaction they exploit a transition from a metastable wurtzite compound in the form of nanorods to the more stable kesterite compound. At the EDDI Beamline at BESSY II, the scientists could observe this process in real-time when heating the sample: in a few seconds Kesterite grains formed. The size of the grains was found to depend on the heating rate.  With fast heating they succeeded in producing a Kesterite thin film with near micrometer-sized crystal grains, which could be used in thin film solar cells. These findings have now been published in the journal “Nature Communications”. [...].

  • <p><span>Scanning electron microscopy of a Perovskite-solar cell: on a glass substrate (glass and FTO) highly porous titanium dioxide is deposited, which is impregnated with perovskite. This film is covered by an organic hole transporting material (HTM) and gold contact. Credit: EPFL</span></p>21.01.2014

    Understanding a new type of solar cell

    Perovskite based solar cells are a hot topic in energy research and Science Magazine has put it on the list of Breakthroughs in 2013. In only a few years their efficiency has increased from 3 % to more than 16 %. However, a detailed explanation of the mechanisms of operation within this photovoltaic system is still lacking.  Scientists from Ecole polytechnique fédérale in Lausanne (EPFL) and of HZB-Institute for Solar Fuels have now uncovered the mechanism by which these novel light-absorbing semiconductors transfer electrons along their surface. They examined perovskite based solar cells with different architectures with time resolved spectroscopy techniques. Their results, which are now published online in Nature photonics, open the way to the design of photovoltaic converters with improved efficiency. [...].

  • <p>The image shows the three-dimensional reconstruction of an atom probe measurement. The &gamma; matrix (purple) can be seen surrounding the cuboidal &gamma;&rsquo; precipitates (green). Only a few nanometre-sized &gamma; platelets can be seen in the &gamma;&rsquo; precipitates. Atom probe tomography allows a site specific analysis of the structure at the atomic scale and reveals the chemical composition in measurements of individual areas. Image: HZB</p>14.01.2014

    What makes superalloys super - hierarchical microstructure of a superalloy

    Researchers have observed for the first time in detail how a hierarchical microstructure develops during heat treatment of a superalloy

    Materials in high-performance turbines have to withstand not only powerful mechanical forces, they also have to maintain their chemical and mechanical properties almost up to their melting points. For this reason, turbine manufacturers have employed special nickel-based high-performance alloys for decades. New work from Helmholtz-Zentrum Berlin für Materialien and Energie (HZB) now shows in detail how new phases in a nickel-based alloy form and evolve, providing clues to how high-performance alloys could be improved. Doctoral student Florian Vogel and Dr. Nelia Wanderka from the HZB Institute of Applied Materials have elegantly combined two methods to accomplish this: transmission electron microscopy (TEM) and atom probe tomography (APT), which they carried out in collaboration with colleagues from the University of Münster. [...].

  • <p>The outline of the lizard serves as a test object, as well as the conventional test pattern, a section of a so called Siemens star. The lizard&rsquo;s tail and the converging rays of the Siemens star can be used to measure how well narrow lines will be reproduced in an image. With a diameter of six thousandths of a millimetre, the entire test object is about the size of a red blood cell. The smallest resolved structure has a width of 46 nanometres. Credit: J. Geilhufe/HZB</p>07.01.2014

    New holographic process uses image-stabilised X-ray camera

    A team headed by Stefan Eisebitt has developed a new X-ray holography method that will enable snap-shots of dynamic processes at highest spatial resolution. The efficiency of the new method is based on a X-ray focussing optics being firmly fixed to the object to be imaged. While this approach initially provides a blurry image, this can be focussed in the computer based on the hologram information. At the same time, the rigid connection between the object and the focussing optics elegantly solves the problem of vibration induced jitter that plays an enormous role at the nanometre scale.

    Prof. Stefan Eisebitt, who heads the division Nanometre and X-Ray Optics at Technische Universität Berlin  and  the joint research group Functional Nanostructures at Helmholtz-Zentrum Berlin (HZB), explains: “Just as a fast objective lens on a camera enables you to get a sharp image even under conditions of weak lighting, our optical element here enables the X-ray light to be used more efficiently as well. At the same time, we have firmly coupled this X-ray lens with the object to be imaged so that vibrations no longer have any detrimental influence and the image is stabilised.” As a consequence, low-contrast or moving nanoobjects can be imaged notably better. [...].