1. Laboratory of Organic Electronics; Department of Science and Technology; Linköping University; SE-601 74 Norrköping Sweden
2. Innventia AB; Box 5604, SE- 114 86 Stockholm Sweden
3. Department of Energy Conversion and Storage; Technical University of Denmark; DK-4000 Roskilde Denmark
4. Department of Physics; Chemistry and Biology; Linköping University; SE-581 83 Linköping Sweden
5. Department of Physics and Astronomy; University of Kentucky; Lexington KY 40506-0055 USA
6. KTH Royal Institute of Technology; School of Chemical Science and Engineering (CHE); Fibre and Polymer Technology and Wallenberg Wood Science Center; SE-100 44 Stockholm Sweden