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Scanning Probe Microscopy of Semiconductor Nanostructures

Welcome to the research group of Bert Voigtländer

  • SPM with the Koala drive
    We have invented a new kind of nanopositioner(Koala drive) for scanning probe microscopy which is the heart of our multi tip STM instruments. … more

  • Germanium Silicon nanostructures
    We explore the controlled formation of Ge /Si nanostructures (wires, rings etc.) having single digit nanometer sizes, as well as the selective growth molecules and metals on these Ge/Si templates. … more

  • Charge transport through nanostructures
    We develop the multi tip scanning tunneling microscope technique as a tool to probe the charge transport properties of nanostructures. … more



Silicon Germanium nanostructures

Self-assembled growth of semiconductor nanostructures is a bottom-up approach to build nanostructures with the help of nature. Recently, nanowires have attracted a lot of interest because they are required to interconnect functional units in nano- and molecular electronics. We found a way of controlled fabrication of Si and Ge nanowires with a width down to 3 nm and a thickness of only one atomic layer (0.3 nm).
Phys. Rev. Lett. 98, 166104 (2007) More: Silicon Germanium nanostructures …


Nanoscopic functional cage clusters

This project aims at a wide-ranging characterization of nanometer-sized functional inorganic fullerene- and metal-oxo-based cluster molecules and their aggregates. The targeted molecules are in the focus of interest as molecular building blocks for nanoelectronics and spintronics due to their unique structural, supramolecular, redox, and magnetic properties. Moreover, these features can be synthetically tuned to a large extent.
Appl. Phys. A 87 (3), 475 (2007) More: Nanoscopic functional cage clusters …


Charge transport through Nanostructures

The controlled fabrication of self-organized nanostructures with dimensions in the single digit nanometer range is becoming possible. However, the measurement of charge transport through such nanostructures is still a challenge. The main problem is to provide contacts to the nanostructures. Our approach is to provide such a contact by a multi-tip STM in order to enable charge transport and scanning potentiometry measurements at self-assembled (surface-) nanostructures.
Rev. Sci. Instr. 77, 093701 (2006) More: Charge transport through Nanostructures …

Microscope films microscope

STM Movies

Image Gallery

Koala drive


Prof. Dr. Bert Voigtländer
Dr. Vasily Cherepanov
Dipl.-Ing. Peter Coenen
Helmut Stollwerk
Dipl.-Phys. Hubertus Junker
Dipl.-Phys. Stefan Korte
Dipl.-Phys. Marcus Blab