1. Department of Chemistry and Chemical Engineering, Chalmers University of Technology, 412 96 Göteborg, Sweden
2. Wallenberg Wood Science Center, Chalmers University of Technology, 412 96 Göteborg, Sweden
3. Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, 602 21 Norrköping, Sweden
4. Wallenberg Wood Science Center, Linköping University, 602 21 Norrköping, Sweden