Öffnet in neuem Fenster Opens in a new window Öffnet externe Seite Opens an external site Öffnet externe Seite in neuem Fenster Opens an external site in a new window

Research

My research activities are concerned with characterization of fundamental loss mechanisms in solar cells and electronic properties of semiconductors and organic materials used for applications in solar cells. Lately, I have started to also conduct research on photon upconversion for 3rd generation photovoltaics. My working groups runs an EPR facility together with the Free University Berlin, the so-called Joint Berlin EPR Laboratory (BeJEL). At BeJEL we try to identify the performance limiting defects of solar cell materials. The main methods that we use for such studies are

  • Continuous-wave electron paramagnetic resonance (cw EPR) and time-domain EPR
  • Electrically and optically detected magnetic resonance (EDMR and ODMR)
    Detection in both continuous-wave and time-domain
  • Photoluminescence
  • Hall effect
  • Scanning electron microscopy
  • Synchrotron-based methods such as THz-EPR and HAXPES

Since 2011 I am the leading manager of the EMIL project at HZB, which is a unique laboratory dedicated to solar cell preparation and in-situ/in-system characterization using X-ray spectroscopy. EMIL will be directly placed at the BESSY II light source and will operate a dedicated X-ray beamline in the energy range 80 eV - 10 keV. EMIL will be taken into operation in 2015.