1980–1991
Various R&D positions at Siemens in Munich.

1979–1980
Scientist at the IBM T. J. Watson Res. Lab. in Yorktown Heights.

1977–1978
Post Doc, Cornell University, NY, USA.

1976
PhD (Dr. rer.nat), University of Stuttgart and Max-Planck-Inst. Metal Physics.

1973
Diploma in Physics, University of Stuttgart.

Since 1991
Chairholder ‘Materials Science’, Founding Dean and elected Dean of the Faculty of Engineering from 1991 to 1998. University of Kiel.

Since 1991
Si and non-Si Solar cells, electrochemistry of semiconductors, MEMS and ME processes, analytics, and process integration, Si materials science, advanced photonics, nanomaterials.

1980-1991
Si solar cells, electrochemistry of Si, microelectronic processes and analytics, Si materials science.

1973-1980
Experiment & Theory of TEM, defects in crystals, solar silicon, silicides.

2008
Leisner, M., Carstensen, J., Föll, H.: FFT impedance spectroscopy analysis of the growth of anodic oxides on (100) p-Si for various solvents. J. Electroanal. Chem. 615/2: 124.

2008
Carstensen, J., Foca, E., Keipert, S., Föll, H., Leisner, M., Cojocaru, A.: New modes of FFT impedance spectroscopy applied to semiconductor pore etching and materials characterization. Phys. Stat. Sol. (a) 205/11: 2485.

2007
Sergentu, V. V., Ursaki, V. V., Tiginyanu, I. M., Foca, E., Föll, H., Boyd, R. W.: Design of negative-refractive-index on the basis of rods with a gradient of the dielectric constant. Appl. Phys. Lett. 91: 081103.

In progress
Petri, I.: Comparative investigations about extracting and working of metals in the west Slavonic area particularly researched in the case of the earthwork Starigard/Oldenburg (Schleswig-Holstein).

In progress
Warnat, S.: Through Silicon Vias in MEMS Packages.

In progress
Kaden, D.: Herstellung piezoelektrischer Bauelemente.

In progress
Leisner, M.: Untersuchungen zur Porenbildung und anodischen Oxidation in Halbleitern.

In progress
Schütt, A.: Optimierung der CELLO-Technik für neuartige Solarzellenkonzepte und schnelle Diagnostik dieser Solarzellen.

In progress
Oldsen, M.: Ein neuartiger Prozess zur Herstellung vakuumgekapselter MEMS-Mikroscannerspiegel auf Waferebene.

2007
Foca, E. :Macropores in Si: fundamental study and prospective applications; summa cum laude.

2007
Jacobsen, H.: Integration von piezoelektrischen Dünnschichten in einen MEMS kompatiblen Prozessablauf auf Waferebene; magna cum laude.

2007
Kochergin, V.Y.: Optical Properties of Metamaterials Based on Porous Semiconductors and Nanocomposites – Theoretical Considerations and Experiments; summa cum laude.

2005
Hasse, G.: Untersuchungen der kinetischen Prozesse an Silizium-Elektroden mit Stromtransienten- und Impedanzmessungen; magna cum laude.

2005
Frey, S. : Novel formation regimes for macropores and porous anodic oxides in silicon; magna cum laude.

2005
Shakhray, M.: Design and Investigation of Microelectromechanical (MEMS) Varactors; magna cum laude.

2004
Langa, S.: Electrochemical pore etching of porous III-V compounds; summa cum laude. Hejjo Al Rifai, M. (2003): Passivierung und Charakterisierung von Defekten in Siliziumsolarzellen; magna cum laude.

2002
Merz, P. : Herstellung von mikrostrukturierten Oberflächen in Glas und Polymer durch replikative Verfahrenstechnologien; magna cum laude.

2002
Christophersen, M.: Untersuchungen zur Makroporenbildung in Silizium und deren technologischen Nutzung; summa cum laude.