News Archive 2020

Am Markt verfügbare Halbleitersensoren weisen nur eine sehr begrenzte Ultraviolett (UV)-Empfindlichkeit auf. Selbst die besten konventionellen UV-Photodioden haben eine Quantenausbeute von unter 80 % im Spektralbereich zwischen 200 nm und 300 nm. Hierbei wird stets die externe...

A nanospectroscopic device platform has been developed for the thermoelectric detection of molecular fingerprints of soft materials at nanometer scale spatial resolution. The technique makes use of a locally generated thermal gradient converted into a thermoelectric voltage that is read out in the underlying device. The thermal gradient is generated by an illuminated atomic force microscope tip...

Wer schon einmal bei klirrender Kälte ohne Handschuhe unterwegs war, weiß wie wichtig die Kenntnis der Temperatur ist. Nicht nur im Alltag sondern auch in nahezu allen Bereichen von Wissenschaft und Technik ist sie von zentraler Bedeutung. Eine weit verbreitete Methode ...

The metrological support of the German and European industries in the development of EUV lithography for semiconductor manufacturing is a major activity of PTB at its Berlin-Adlershof site. The close cooperation with ZEISS since 1998 forms a significant basis for the continuous development of PTB's metrological capabilities in the extreme ultraviolet spectral range (EUV). Based on the use of...

Perovskite solar cells (CsPbI_3-xBr_x) with a low bandgap are an important ingredient in the development of highly efficient tandem solar cells, which layer a perovskite solar cell on top of a silicon solar cell to combine the light harvesting capabilities of both and reach high overall efficiency. The efficiency is vastly influenced by the crystal structure - phase composition and crystal...

A new algorithm allows the fast reconstruction of atom distributions in 3D nanostructured surfaces

Over the last years, PTB has developed a new method for atom-specific reconstruction of periodically nanostructured surfaces. Recent studies have shown experimentally that it is possible to reconstruct and identify the spatial distribution of different atomic species in nano-components using X-ray...

The DFG – project "Bayesian compressed sensing for nanoscale chemical mapping in the mid-infrared regime" has started at the beginning of this year. The project aims at the reduction of large amounts of data and measurement times in scanning probe-based spectroscopy with broadband infrared synchrotron radiation. Scanning probe techniques with their pixel-by-pixel data acquisition and conventional...

The Ioffe Institute of the Russian Academy of Sciences in St. Petersburg has appointed Prof. Dr. Mathias Richter, Head of PTB Division 7, as honorary member. Since 1992, this honour has also been bestowed annually on external scientists. The laureate lecture at the ceremony on January 24, 2020, ...