Deutsche Gesellschaft für Materialkunde was a guest of HZB
Tour at BESSY II.
Tour through the experimental hall of BER II.
From 15 to 16 March, the Deutsche Gesellschaft für Materialkunde, DGM (German association of materials science), held its closed board meeting and Advisory Council meeting at HZB. The experts took the occasion to visit the synchrotron source BESSY II and the neutron source BER II, gaining an insight into important future projects of HZB.
“It was a great pleasure to be host to the Deutsche Gesellschaft für Materialkunde, where we had the opportunity to present Helmholtz-Zentrum Berlin’s strategies and research infrastructures, which external researchers are also very welcome to use,“ says Prof. Dr. Anke Kaysser-Pyzalla, scientific director of HZB.
The board members of the DGM visited the control room and experimental hall of BESSY II on 15 March. On 16 March, the DGM Advisory Council toured the neutron guide hall at BER II and the CoreLab “Correlative Microscopy and Spectroscopy”, which is home to latest generation ZEISS electron and ion microscopes for use by external users and employees of HZB.
The Deutsche Gesellschaft für Materialkunde is dedicated to promoting continual advancements in topics, structures and careers in the field of materials science and engineering. Its strategies include fostering cooperation between universities, research institutions, companies, and national and international partners, and promoting new collaborative projects. The DGM organises many symposia and congresses that are also important information exchange platforms for many scientists of HZB.
- Long-term stability for perovskite solar cells: a big step forwardPerovskite solar cells are inexpensive to produce and generate a high amount of electric power per surface area. However, they are not yet stable enough, losing efficiency more rapidly than the silicon market standard. Now, an international team led by Prof. Dr. Antonio Abate has dramatically increased their stability by applying a novel coating to the interface between the surface of the perovskite and the top contact layer. This has even boosted efficiency to almost 27%, which represents the state-of-the-art. After 1,200 hours of continuous operation under standard illumination, no decrease in efficiency was observed. The study involved research teams from China, Italy, Switzerland and Germany and has been published in Nature Photonics.
- BESSY II: Phosphorus chains – a 1D material with 1D electronic propertiesFor the first time, a team at BESSY II has succeeded in demonstrating the one-dimensional electronic properties in phosphorus. The samples consisted of short chains of phosphorus atoms that self-organise at specific angles on a silver substrate. Through sophisticated analysis, the team was able to disentangle the contributions of these differently aligned chains. This revealed that the electronic properties of each chain are indeed one-dimensional. Calculations predict an exciting phase transition to be expected as soon as these chains are more closely packed. While material consisting of individual chains with longer distances is semiconducting, a very dense chain structure would be metallic.
- Did marine life in the palaeocene use a compass?Some ancient marine organisms produced mysterious magnetic particles of unusually large size, which can now be found as fossils in marine sediments. An international team has succeeded in mapping the magnetic domains on one of such ‘giant magnetofossils’ using a sophisticated method at the Diamond X-ray source. Their analysis shows that these particles could have allowed these organisms to sense tiny variations in both the direction and intensity of the Earth’s magnetic field, enabling them to geolocate themselves and navigate across the ocean. The method offers a powerful tool for magnetically testing whether putative biological iron oxide particles in Mars samples have a biogenic origin.