Working Group Device Physics

Head: Prof. Dr. Ralph Krupke

Our working group investigates the charge transport and light-matter interaction in carbon nanosystems. Molecular nanostructures such as carbon nanotubes and graphene have fascinating properties and are of great interest to science and technology. We integrate the material into complex device structures, perform fundamental science experiments, and explore the materials potential for electronics, optoelectronics and sensing applications.

Our current research focuses on:

  • Nanoscale light emission and detection
  • Graphene-based device structures
  • Carbon Nanotube based Solar Cells

Over the last decade we have reached the milestones:

  • Separation of metallic from semiconducting carbon nanotubes
  • Parallel assembling of carbon nanotube into high-density devices arrays
  • Light emission from single nanotube-molecule-nanotube junctions
  • Narrow-band thermal light emission from cavity-controlled graphene transistor
  • 153GHz semiconducting carbon nanotube transistor
  • Waveguide-integrated carbon nanotube emitters

Our research is funded by the Helmholtz Program Science and Technology of Nanosystems (STN) and we are part of the subtopic Carbon Nanosystems. Major external funding is provided by the VolkswagenStiftung and the German Science Foundation.

More information

Fig. 1: Schematic view of a waveguide with integrated semiconducting single-walled carbon nanotubes and two superconducting nanowire single-photon detectors, all biased electrically [1].
Fig. 2: Bilayer-graphene based heterostructure device [2]
a 3D Schematics of the device
b cross-sectional view


Current research interests:



Selected Publications


Members (in alphabetical order)
Name Tel
Bld.-Room E-Mail
romain danneauGgn9∂kit edu
ralph krupkeGgn9∂kit edu
min-ken liGgn9∂kit edu
devang parmarGgn9∂kit edu