1. Department of Chemistry & IRIS Adlershof, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, D-12489 Berlin, Germany
2. Institute of Organic Chemistry II and Advanced Materials, Ulm University, Albert-Einstein-Allee 11, D-89081 Ulm, Germany
3. Bundesanstalt für Materialforschung und -prüfung (BAM), 12205 Berlin, Germany
4. Institute of Organic Chemistry, University of Freiburg, Albertstr. 21, 79104 Freiburg, Germany
5. Helmholtz Institute Ulm (HIU), Helmholtzstrasse 11, 89081 Ulm, Germany
6. Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany