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

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Predicting solar cell performance from terahertz and microwave spectroscopy

Reliably determine the mobility and lifetime of the charge carriers in new semiconducting materials

08-Mar-2022

Many semiconducting materials are possible candidates for solar cells. In recent years, perovskite semiconductors in particular have attracted attention, as they are both inexpensive and easy to process and enable high efficiencies. Now a study with 15 participating research institutions shows ...

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An electronic rainbow – perovskite spectrometer by inkjet printing

04-Jan-2022

Researchers from Innovation Lab HySPRINT at Helmholtz-Zentrum Berlin (HZB) and Humboldt Universität zu Berlin (HU) have used an advanced inkjet printing technique to produce a large range of photodetector devices based on a hybrid perovskite semiconductor. By mixing of only three inks, the ...

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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"

29-Sep-2021

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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When vibrations increase on cooling: Anti-freezing observed

Completely unusual and never observed like this before

10-Aug-2021

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

02-Aug-2021

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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Perovskite Solar Cells: Insights into early stages of structure formation

Colloidal chemistry of perovskite precursor solutions investigated

25-Jun-2021

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

03-Jun-2021

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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Solar cells: Losses made visible on the nanoscale

19-Mar-2021

Solar cells made of crystalline silicon achieve peak efficiencies, especially in combination with selective contacts made of amorphous silicon (a-Si:H). However, their efficiency is limited by losses in these contact layers. Now, for the first time, a team at Helmholtz-Zentrum Berlin (HZB) and ...

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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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Nanopatterns of proteins detected by cryo-electron microscopy

Nanostructures for electronics, catalysis, medicine

22-Oct-2020

A team from Helmholtz-Zentrum Berlin (HZB) used cryo electron microscopy to detect regular, two-dimensional structures in the form of Pascal triangles in a shock frozen protein material. The samples have been synthesized by a Chinese research group. The method of cryo electron microscopy has the ...

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