1. Institute of Organic Chemistry III, Macromolecular Chemistry and Organic Materials, University of Ulm, Albert-Einstein-Allee 11, 89081 Ulm, Germany
2. Institute of Solid State Physics, University of Ulm, Albert-Einstein-Allee 11, 89081 Ulm, Germany
3. Transmission Electron Microscopy Group, University of Ulm, Albert-Einstein-Allee 11, 89081 Ulm, Germany
4. Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany