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Sear results - Rubric: Science Highlight
When vibrations increase on cooling: Anti-freezing observed An international team has observed an amazing phenomenon in a nickel oxide material during cooling: Instead of freezing, certain fluctuations actually increase as the temperature drops. This is interesting also for high Tc-Superconductor research.
Lead-free perovskite solar cells - How fluoride additives improve quality Using a clever combination of measurement methods at BESSY II and with NMR at the Humboldt-University Berlin, they were able to show that fluoride prevents the oxidation of tin and leads to a more homogeneous film formation with fewer defects.
Future information technologies: Topological materials for ultrafast spintronics Using time- and spin-resolved methods at BESSY II, the physicists explored how, after optical excitation, the complex interplay in the behavior of excited electrons in the bulk and on the surface results in unusual spin dynamics.
Accelerator physics: Experiment reveals new options for synchrotron light... Using this method, specialised synchrotron radiation sources would potentially be able to fill a gap in the arsenal of available light sources and offer a prototype for industrial applications. The work was published in Nature.
Perovskite/silicon tandem solar cells on the threshold of 30% efficiency The tandem cell provided stable performance for 300 hours – even without encapsulation. To accomplish this, the group headed by Prof. Steve Albrecht investigated physical processes at the interfaces to improve the transport of the charge carriers.
Future Information Technologies: Germanium telluride's hidden properties at the... Germanium Telluride is an interesting candidate material for spintronic devices. At BESSY II, a Helmholtz-RSF Joint Research Group has revealed how the spin texture switches by ferroelectric polarization within individual nanodomains.
Order in the disorder: density fluctuations in amorphous silicon discovered Such a-Si:H thin films have been used for decades in solar cells, TFT displays, and detectors. The results show that three different phases form within the amorphous matrix, which influences the quality and lifetime of the semiconductor layer.