1. Institute of Electronic Structure and Laser, Foundation for Research and Technology - Hellas, 70013 Heraklion, Crete, Greece
2. Department of Materials Science and Technology, University of Crete, 70013 Heraklion, Crete, Greece
3. Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
4. Physics & Materials Science Research Unit, University of Luxembourg, 162a Avenue de la Faiencerie, Luxembourg L-1511, Luxembourg
5. Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
6. Max-Planck Institute for Polymer Research, 55128 Mainz, Germany