1. Electron Microscopy Center, Empa––Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600, Dübendorf, Switzerland
2. Laboratory for Thin Films and Photovoltaics, Empa––Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600, Dübendorf, Switzerland
3. Department of Materials, ETHZ––Swiss Federal Institute of Technology Zürich, Leopold-Ruzicka-Weg 4, CH-8093, Zürich, Switzerland
4. Laboratory of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, Switzerland