1. DTU Nanolab, Technical University of Denmark, Fysikvej, 2800 Kgs Lyngby, Denmark
2. Thin Film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping SE-58183, Sweden
3. Department of Physics, Chalmers University of Technology, 412 96 Göteborg, Sweden
4. Department of Physics, Informatics and Mathematics, University of Modena and Reggio Emilia, 41121 Modena, Italy
5. Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej, 2800 Kgs. Lyngby, Denmark