1. Institute
of Solid State Physics, Friedrich Schiller University, Helmholtzweg
5, 07743 Jena, Germany
2. Institute
of Condensed Matter Theory and Solid State Optics, Friedrich Schiller University, Fröbelstieg 1, 07743 Jena, Germany
3. Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
4. Center
for Advancing Electronics, University of Technology Dresden, Würzburger
Strasse 46, 01187 Dresden, Germany
5. Graduate
School of Science and Institute for Academic Initiatives, Department
of Chemistry, Osaka University, 1-1 Machikaneyama, Toyonaka 560-0043, Osaka, Japan