1. Department of Physics; Chemistry and Biology (IFM); Linköping University; SE-58183 Linköping Sweden
2. State Key Laboratory of Polymer Physics and Chemistry; Beijing National Laboratory for Molecular Sciences; CAS Research/Education Center for Excellence in Molecular Sciences; Institute of Chemistry; Chinese Academy of Sciences; 100190 Beijing China
3. Instituut voor Materiaalonderzoek (IMO-IMOMEC); Hasselt University; Wetenschapspark 1 BE-3590 Diepenbeek Belgium
4. IEK5-Photovoltaik; Forschungszentrum Jülich; 52425 Jülich Germany
5. Faculty of Engineering and CENIDE; University of Duisburg-Essen; Carl-Benz-Str. 199 47057 Duisburg Germany