Please note: the date of this seminar has changed since it was first posted.
Carsten Ronning
Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena
Semiconductor nanowires are of major importance within the area of nanotechnology, and are usually synthesized using the vapor-liquid-solid (VLS) mechanism. They serve as both functional units as well as the wires that access them; therefore, they are ideal building blocks for functional nanoscale devices. Applications and proto-type devices based on semiconductor nanowires have been realized in various areas: in electronics, photonics, mechanics, and sensors. I will summarize and focus my presentation on the use of semconductor nanowires for photonic applications: this will include waveguiding, light emitting diodes, and lasers. I will finish the seminar on controlled doping of semiconductor nanowires, which is a necessary issue in order to make full use of them as devices. However, this is an unsolved problem and an extremely difficult task if using the VLS growth mechanism. We use an alternative route for modifying the electrical, optical and magnetic properties of semiconductor nanowires: ion implantation. One example on doping of semiconductor nanowires will be presented.
Speaker biography
Prof. Dr. Carsten Ronning is full professor at the Institute of Solid State Physics at the Friedrich-Schiller-University of Jena, Germany. He studied physics at the Universities of Bremen and Konstanz, and completed his PhD thesis entitled “Diamond-like materials prepared via mass selected ion beam deposition” in 1996. After holding a post-doc position at the North-Carolina State University (USA), he performed intense research at the University of Göttingen on thin films, semiconductor physics as well as on semiconductor nanowires. His position today at the University Jena, which he took over in 2008, includes the heading of a photovoltaics group specialized on the preparation of CdTe and CIGS thin film solar cells.