1. Laboratory of Organic Electronics Department of Science and Technology Linköping University Norrköping SE‐601 74 Sweden
2. Wallenberg Wood Science Center Department of Science and Technology Linköping University Norrköping SE‐601 74 Sweden
3. Wallenberg Wood Science Center Department of Chemistry and Chemical Engineering Chalmers University of Technology Göteborg SE‐412 06 Sweden
4. n‐Ink AB Teknikringen 7 Linköping SE‐583 30 Sweden