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113 Current news of Helmholtz-Zentrum Berlin für Materialien und Energie

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Printed perovskite LEDs

An innovative technique towards a new standard process of electronics manufacturing

15-Jun-2020

A team of researchers from the Helmholtz-Zentrum Berlin (HZB) and Humboldt-Universität zu Berlin has succeeded for the first time in producing light-emitting diodes (LEDs) from a hybrid perovskite semiconductor material using inkjet printing.This opens the door to broad application of these ...

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Experiment shows for the first time in detail how electrolytes become metallic

The transition to the state is shown by a change of colour from blue to gold

08-Jun-2020

An international team has developed a sophisticated experimental technique at BESSY II to observe the formation of a metallic conduction band in electrolytes. To accomplish this, the team first prepared cryogenic solutions of liquid ammonia containing different concentrations of alkali metals. ...

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On the road to non-toxic and stable perovskite solar cells

Tin instead of lead

13-May-2020

The promising halide perovskite materials for solar energy conversion show high efficiencies, but this comes at a cost: The best perovskite materials incorporate toxic lead which poses a hazard to the environment. To replace lead by less toxic elements is not easy since lead-free perovskites show ...

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3D Quantum Spin Liquid revealed

12-May-2020

Quantum Spin Liquids are candidates for potential use in future information technologies. So far, Quantum Spin Liquids have usually only been found in one or two dimensional magnetic systems only. Now an international team led by HZB scientists has investigated crystals of PbCuTe2O6 with neutron ...

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How new materials increase the efficiency of direct ethanol fuel cells

Composite membrane consists of Nafion with embedded nanoparticles

06-May-2020

A group from Brazil and an HZB team have investigated a novel composite membrane for ethanol fuel cells. It consists of the polymer Nafion, in which nanoparticles of a titanium compound are embedded by the rarely explored melt extrusion process. At BESSY II they were able to observe in detail, ...

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Ultra-fast switching of helicity of circularly polarized light pulses

The ultra-fast change of light helicity is particularly interesting to observe processes in magnetic materials

03-Apr-2020

At the BESSY II storage ring, a joint team of accelerator physicists, undulator experts and experimenters has shown how the helicity of circularly polarized synchrotron radiation can be switched faster - up to a million times faster than before. They used an elliptical double-undulator developed ...

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Fast and furious: New class of 2D materials stores electrical energy

04-Mar-2020

Two dimensional titanium carbides, so-called MXenes, are being discussed as candidates for the rapid storage of electrical energy. Like a battery,MXenes can store large amounts of electrical energy through electrochemical reactions- but unlike batteries,can be charged and discharged in a matter ...

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Not everything is ferromagnetic in high magnetic fields

12-Feb-2020

High magnetic fields have a potential to modify the microscopic arrangement of magnetic moments because they overcome interactions existing in zero field. Usually, high fields exceeding a certain critical value force the moments to align in the same direction as the field leading to ferromagnetic ...

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Using neutrons and X-rays to analyse the ageing of lithium batteries

11-Feb-2020

An international team has used neutron and X-ray tomography to investigate the dynamic processes that lead to capacity degradation at the electrodes in lithium batteries. Using a new mathematical method, it was possible to virtually unwind electrodes that had been wound into the form of a compact ...

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Dynamic pattern of Skyrmions observed

18-Oct-2019

Tiny magnetic vortices known as skyrmions form in certain magnetic materials, such as Cu2OSeO3. These skyrmions can be controlled by low-level electrical currents – which could facilitate more energy-efficient data processing. Now a team has succeeded in developing a new technique at the VEKMAG ...

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