1. Karlsruhe Institute of Technology (KIT), Institute for Applied Materials Materials Processing Technology, P.O. Box 3640, 76021 Karlsruhe, Germany
2. Forschungszentrum Jülich, Institute for Energy Research, 52452 Jülich, Germany
3. Karlsruhe Institute of Technology (KIT), Institute for Applied Materials Applied Materials Physics, P.O. Box 3640, 76021 Karlsruhe, Germany