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

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How light activates MoS2 layers to become catalysts

08-Mar-2021

Thin films of molybdenum and sulfur belong to a class of materials that can be considered for use as photocatalysts. Inexpensive catalysts such as these are needed to produce hydrogen as a fuel using solar energy. However, they are still not very efficient as catalysts. A new instrument at the ...

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New skills of Graphene: Tunable lattice vibrations

This is a real breakthrough in the field of phononics

02-Mar-2021

Technological innovation in the last century was mainly based on the control of electrons or photons. Now, in the emerging research field of phononics, phonons or vibrations of the crystal lattice attract attention. A team at Freie Universität Berlin and Helmholtz-Zentrum Berlin showed a ...

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The perfect recipe for efficient perovskite solar cells

23-Feb-2021

A long-cherished dream of materials researchers is a solar cell that converts sunlight into electrical energy as efficiently as silicon, but that can be easily and inexpensively fabricated from abundant materials. Scientists at the Helmholtz-Zentrum Berlin have now come a step closer to achieving ...

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An efficient tool to link X-ray experiments and ab initio theory

Results can even be calculated during the experiment

01-Feb-2021

The electronic structure of complex molecules and their chemical reactivity can be assessed by the method of resonant inelastic X-ray scattering (RIXS) at BESSY II. However, the evaluation of RIXS data has so far required very long computing times. A team at BESSY II has now developed a new ...

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Solar hydrogen: Photoanodes made of α-SnWO4 promise high efficiencies

28-Jan-2021

Photoanodes made of metal oxides are considered to be a viable solution for the production of hydrogen with sunlight. α-SnWO4 has optimal electronic properties for photoelectrochemical water splitting with sunlight, but corrodes easily. Protective layers of nickel oxide prevent corrosion, but ...

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Perovskite/silicon tandem solar cells on the threshold of 30% efficiency

Consistent performance over 300 hours

14-Dec-2020

An HZB team has published a report in the journal Science on the development of its current world record of 29.15% efficiency for a tandem solar cell made of perovskite and silicon. The tandem cell provided stable performance for 300 hours – even without encapsulation. To accomplish this, the ...

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Perovskite Solar Cells: paving the way for rational ink design for industrial-scale manufacturing

01-Dec-2020

For the production of high-quality metal-halide perovskite thin-films for large area photovoltaic modules often optimized inks are used which contain a mixture of solvents. An HZB team at BESSY II has now analysed the crystallisation processes within such mixtures. A model has also been developed ...

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Green hydrogen: buoyancy-driven convection in the electrolyte

For the first time investigated, how the liquid electrolyte throughout the cell behaves during electrolysis

23-Nov-2020

Hydrogen produced by using solar energy could contribute to a climate neutral energy system of the future. But there are hurdles on the way from laboratory scale to large-scale implementation. A team at HZB has now presented a method to visualise convection in the electrolyte and to reliably ...

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Germanium telluride's hidden properties at the nanoscale revealed

How the spin texture switches by ferroelectric polarization within individual nanodomains

10-Nov-2020

Germanium Telluride is an interesting candidate material for spintronic devices. In a comprehensive study at BESSY II, a Helmholtz-RSF Joint Research Group has now revealed how the spin texture switches by ferroelectric polarization within individual nanodomains. Germanium telluride (GeTe) is ...

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Order in the disorder: density fluctuations in amorphous silicon discovered

New study shows that three different phases form within the amorphous matrix, which influences the quality and lifetime of the semiconductor layer

02-Nov-2020

For the first time, a team at HZB has identified the atomic substructure of amorphous silicon with a resolution of 0.8 nanometres using X-ray and neutron scattering at BESSY II and BER II. Such a-Si:H thin films have been used for decades in solar cells, TFT displays, and detectors. The results ...

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