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

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Blue phosphorus - mapped and measured for the first time

18-Oct-2018

Until recently, the existence of "blue" phosphorus was pure theory: Now an HZB team was able to examine samples of blue phosphorus at BESSY II for the first time and confirm via mapping of their electronic band structure that this is actually this exotic phosphorus modification. Blue phosphorus ...

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Researchers are used to boost the efficiency of silicon solar cells

09-Oct-2018

The efficiency of a solar cell is one of its most important parameters. It indicates what percentage of the solar energy radiated into the cell is converted into electrical energy. The theoretical limit for silicon solar cells is 29.3 percent due to physical material properties. In the journal ...

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Nanoscale heat transport under the microscope

27-Aug-2018

A team of researchers from the Helmholtz-Zentrum Berlin (HZB) and the University of Potsdam has investigated heat transport in a model system comprising nanometre-thin metallic and magnetic layers. Similar systems are candidates for future high-efficiency data storage devices that can be locally ...

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Fastest 3D tomographic images at BESSY II

10-Aug-2018

An HZB team has developed an ingenious precision rotary table at the EDDI beamline at BESSY II and combined it with particularly fast optics. This enabled them to document the formation of pores in grains of metal during foaming processes at 25 tomographic images per second - a world record. The ...

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Insight into loss processes in perovskite solar cells enables efficiency improvements

03-Aug-2018

In perovskite solar cells, charge carriers are mainly lost through recombination occurring at interface defect sites. In contrast, recombination at defect sites within the perovskite layer does not limit the performance of the solar cells at present. Teams from the University of Potsdam and the ...

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Insight into catalysis through novel study of X-ray absorption spectroscopy

02-Aug-2018

An international team has made a breakthrough at BESSY II. For the first time, they succeeded in investigating electronic states of a transition metal in detail and drawing reliable conclusions on their catalytic effect from the data. These results are helpful for the development of future ...

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New world record for direct solar water-splitting efficiency

06-Jul-2018

Hydrogen will play a central role as a storage medium in sustainable energy systems. An international team of researchers has now succeeded in raising the efficiency of producing hydrogen from direct solar water-splitting to a record 19 per cent. They did so by combining a tandem solar cell of ...

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Better kesterite solar cells with germanium

03-Apr-2018

Specific changes in the composition of kesterite-type semiconductors make it possible to improve their suitability as absorber layers in solar cells. As a team at the Helmholtz-Zentrum Berlin showed, this is particularly true for kesterites in which tin was replaced by germanium. The scientists ...

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Nanostructuring increases efficiency of metal-free photocatalysts by factor eleven

Solar–to-hydrogen conversion

02-Mar-2018

Polymeric carbon nitrides exhibit a catalytic effect in sunlight that can be used for the production of hydrogen from solar energy. However, the efficiency of these metal-free catalysts is extremely low. A team at the Tianjin University in China, in collaboration with a group at the ...

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Luminescent nano-architectures of gallium arsenide

23-Feb-2018

A team at the HZB has succeeded in growing nanocrystals of gallium arsenide on tiny columns of silicon and germanium. This enables extremely efficient optoelectronic components for important frequency ranges to be realised on silicon chips. Gallium arsenide semiconductors have better ...

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