1. Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, SE-60174 Norrköping, Sweden
2. Wallenberg Wood Science Center, Department of Science and Technology, Linköping University, SE-60174 Norrköping, Sweden
3. Wallenberg Initiative Materials Science for Sustainability, Department of Science and Technology, Linköping University, SE-60174 Norrköping, Sweden
4. Department of Chemistry, College of Science, Korea University, Seoul 136-713, Republic of Korea
5. n-Ink AB, Bredgatan 33, SE-60221 Norrköping, Sweden