1. Department of Chemistry and Chemical Engineering Chalmers University of Technology Göteborg 412 96 Sweden
2. Wallenberg Wood Science Center Chalmers University of Technology Göteborg 412 96 Sweden
3. Laboratory of Organic Electronics Department of Science and Technology Linköping University Norrköping 60174 Sweden
4. n‐Ink AB Norrköping 60174 Sweden
5. College of Electrical Engineering Sichuan University Chengdu 610065 China
6. Department of Bioproducts and Biosystems Aalto University Espoo 02150 Finland
7. Wallenberg Wood Science Center Linköping University Norrköping 60174 Sweden