Radiometry with Synchrotron Radiation

Department 7.1

Tasks

Application of synchrotron radiation in the THz, IR, UV, EUV, VUV, and soft X-ray spectral range at the electron storage rings Metrology Light Source (MLS) and BESSY II for basic and applied metrological tasks:

Realisation of spectral responsivity scales in the UV, VUV, EUV, and soft X-ray ranges by means of cryogenic radiometers as primary detector standards
Calibration of radiation sources and detectors from the UV to soft X-rays
Photon diagnostics and materials research at X-ray lasers
Characterisation of space instrumentation
Reflectometry on optical components and materials from the UV to X-rays, in particular for EUV lithography
Investigation of nanolayers and nanostructure applying scattering techniques, soft X-ray reflectometry and IR-nearfieldmicroskopy
Quantitative characterization of surfaces and thin layers applying VUV ellipsometry, lectron spectroscopy and IR-spectrometry

News

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...

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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...

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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...

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