1. Institute for Analytical Sciences, Department Berlin, Albert-Einstein-Strasse 9, 12489 Berlin, Germany, Deutsches Elektronen-Synchrotron, Notkestrasse 85, 22607 Hamburg, Germany, Hahn-Meitner-Institut Berlin GmbH, Abteilung Silizium-Photovoltaik, Kekuléstrasse 5, 12489 Berlin, Germany, and Institute of Material Science, TU Darmstadt, Petersenstrasse 23, 64287 Darmstadt, Germany