So-Li-AS

Solid Liquid Analysis System

Figure 1. SOLIAS

Figure 1. SOLIAS


Methods

NEXAFS, XPS, UPS

Remote access

not possible

Station data
Temperature range 77 - 700 K
Pressure range contact the responsible scientists for details
Detector SPECS Phoibos 150 with DLD Detector (energy range 15-3000 eV) SPECS ErLEED (three grids)
Manipulators Manufacturer: Vab Δz=600 mm (motorized) Δx=50 mm, Δy=50 mm (manually) rotation ΔΦ=360° (manually) azimuth Δϑ=180° (manually)
Sample holder compatibility contact the responsible scientists for details
Additional equipment
Heating and sputter station RT – 1000 K; SPECS Ar-sputter gun
Electrochemistry cell Ar or N purged glass vessel attached to the SoLiAS for in-situ investigations
Instrument responsible Prof. Dr. Jan Philipp Hofmann
Assigned to beamline(s)
U49-2_PGM-1 85 - 1600 eV
PM3 20 - 1900 eV
Figure 2. Electrochemistry cell.

Figure 2. Electrochemistry cell.

Figure 3. SOLIAS endstation layout

Figure 3. SOLIAS endstation layout


The Surface Science Laboratory at Technical University of Darmstadt operates a dedicated UHV system for photoemission spectroscopy (PES) experiments with synchrotron radiation as excitation at the Berlin synchrotron facility (BESSY II). The so called SOLIAS system (solid liquid analysis system - Figure 1) is especially designed for the investigation of the solid-liquid interface and offers the possibility to deposit volatile materials on surfaces of interest and freeze them (LN2) in order to perform PES or low energy electron diffraction (LEED) analysis. Furthermore, an electrochemical treatment of samples under inert atmosphere is possible in a dedicated electrochemistry cell which is attached to the SOLIAS - Figure 2. To keep a high degree of flexibility, it is mounted on a moveable frame to allow the attachment to various beamlines - Figure 3. At BESSY II, mainly the U49-2/PGM-1 beamline with photon energies of 90 … 2000 eV is used. Soft X-ray and resonant photoemission spectroscopy experiments with varying excitation energy are also possible. In addition to the mentioned PES experiments, also X-ray absorption (XAS) experiments can be carried out. At the moment the SOLIAS system is mainly used for fundamental research on Li-batteries, electrocatalysts, semiconductors for water splitting and absorber materials for thin film photovoltaics.

Instrument application

  • Investigation of solids (amorphous, crystalline), especially semiconductor and metals
  • Studying the interface and surface reactions after we-chemical treatment (e.g. chemical shift)
  • Varying the information depth by tuning the excitation energy
  • Measurement of the electronic properties of the surface (e.g. band line-up, valence band maximum, or work function)
  • X-ray absorption measurements (total electron yield)
  • Attachment of customer UHV systems for special scientific tasks (deposition or adsorption of new materials)
  • Electrochemistry in combination with PES and LEED with an in-situ approach