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


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Perovskite solar cells: Defects trap charge carriers - and release them again

Results could help to further improve the properties of perovskite solar cells


A new study has investigated how charge carriers in so called MAPI-perovskite semiconductors interact with different defects. The results shows that a large proportion of defects quickly releases trapped charge carriers. These results could help to further improve the properties of perovskite ...


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New world record in materials research - X-ray microscopy with 1000 tomograms per second

"This method opens a door for the non-destructive study of fast processes in materials, which is what many research groups and also industry have been waiting for"


Tomoscopy is an imaging method in which three-dimensional images of the inside of materials are calculated in rapid succession. Now a team led by HZB physicist Francisco García Moreno has achieved a new world record at the TOMCAT beamline of the Swiss Light Source at the Paul Scherrer Institute: ...


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Green hydrogen: Why do certain catalysts improve in operation?

Interesting discovery


Crystalline cobalt arsenide is a catalyst that generates oxygen during electrolytic water splitting in the production of hydrogen. The material is considered to be a model system for an important group of catalysts whose performance increases under certain conditions in the course of ...


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When vibrations increase on cooling: Anti-freezing observed

Completely unusual and never observed like this before


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. Nickel oxide is a model system that is structurally similar to high-temperature superconductors. The experiment ...


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Water detected as a metal at BESSY II


Under normal conditions, pure water is an almost perfect insulator. Water only develops metallic properties under extreme pressure, such as exists at most in the interior of large planets. Now, an international collaboration has used a completely different approach to produce metallic water and ...


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Lead-free perovskite solar cells

How fluorine additives improve quality


Tin halide perovskites are currently considered the best alternative to lead-containing analogues, but are still significantly less efficient and stable compared to them. Now, a team led by Prof. Antonio Abate from HZB has analysed the chemical processes in the perovskite precursor solution and ...


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Perovskite Solar Cells: Insights into early stages of structure formation

Colloidal chemistry of perovskite precursor solutions investigated


Using small-angle scattering at the PTB X-ray beamline of BESSY II, an HZB team was able to experimentally investigate the colloidal chemistry of perovskite precursor solutions used for solar cell production. The results contribute to the targeted and systematic optimization of the manufacturing ...


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New insights into switchable MOF structures


Metal-organic framework compounds (MOFs) are widely used in gas storage, material separation, sensor technology or catalysis. A team led by Prof. Dr. Stefan Kaskel, TU Dresden, has now investigated a special class of these MOFs at the MX beamlines of BESSY II. These are "switchable" MOFs that can ...


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Direct observation of the ad- and desorption of guest atoms into a mesoporous host

New insights into energy materials


Battery electrodes, storage devices for gases, and some catalyst materials have tiny functional pores that can accommodate atoms, ions, and molecules. How these guest atoms are absorbed into or released from the pores is crucial to understanding the porous materials' functionality. However, ...


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Green hydrogen: "Rust" as a photoanode and its limits

“With this new approach, we have added a powerful tool to our arsenal that enables us to identify the realizable potential of photoelectrode materials"


Metal oxides such as rust are intriguing photoelectrode materials for the production of green hydrogen with sunlight. They are cheap and abundant, but in spite of decades of research, progress has been limited. A team at HZB, together with partners from Ben Gurion University and the Technion, ...


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