Dr. Tim Hellmann

Fachgebiet Oberflächenforschung

Arbeitsgebiet(e)

Photovoltaik

Kontakt

work +49 6151 16-20762
fax +49 6151 16-20771

Work L2|01 057
Alarich-Weiss-Str. 2
64287 Darmstadt

In my PhD-project I am using PES measurements on surfaces and interfaces of perovskite solar cells to determine the energy band diagram of full perovskite solar cell devices. By performing these measurements not only in the dark but also under illumination, I identify at which interfaces a surface photovoltage and therefore the open-circuit voltage of the device appears.

  • Photoelectron Spectroscopy (XPS/UPS)
    • standard measurements on thin films and powders
    • surface photovoltage measurements
    • interface experiments to determine energy band diagrams
  • Additional material characterization
    • scanning electron microscopy
    • X-ray diffraction
    • ultraviolet–visible spectroscopy
    • J-V measurements
  • Thin film deposition
    • co-evaporation of halide perovskites
    • close space sublimation
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