1. Electron Microscopy Center, Empa─Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland
2. Materials for Energy Conversion, Empa─Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland
3. Departement of Information Technology and Electrical Engineering─ETH Zürich, Gloriastrasse 35, 8092 Zürich, Switzerland
4. Institute of Materials−EPFL, Station 12, 1015 Lausanne, Switzerland
5. Departement of Materials─ETH Zürich, Wolfgang-Pauli-Strasse 10, 8049 Zürich, Switzerland