1. Laboratory of Organic ElectronicsDepartment of Science and TechnologyLinköping University Norrköping SE‐60174 Sweden
2. Wallenberg Wood Science CenterLinköping University Norrköping SE‐60174 Sweden
3. Department of Fibre and Polymer TechnologyKTH Royal Institute of Technology Teknikringen 56 Stockholm 10044 Sweden
4. Wallenberg Wood Science CentreDepartment of Fibre and Polymer TechnologyKTH Royal Institute of Technology Teknikringen 56 Stockholm 10044 Sweden