1. Thin Film Physics Division; Department of Physics, Chemistry, and Biology (IFM); Linköping University; SE-581 83 Linköping Sweden
2. Department of Energy Conversion and Storage; Technical University of Denmark, Risø Campus; Frederiksborgvej 399, Building 779 4000 Roskilde Denmark
3. Helmholtz-Zentrum Geesthacht; Centre for Materials and Coastal Research; Institute for Materials Research; Max-Planck-Straße 1 21502 Geesthacht Germany