1. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH Hahn-Meitner-Platz 1 Berlin 14109 Germany
2. Stuttgart Center for Electron Microscopy Max Planck Institute for Solid State Research Heisenbergstr. 1 Stuttgart 70569 Germany
3. Research Center for Photovoltaics National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Baraki 305-8568 Japan
4. Renewable Energy Research Center National Institute of Advanced Industrial Science and Technology (AIST) Koriyama Fukushima 903-0298 Japan