1. Laboratory of Organic Electronics Department of Science and Technology (ITN) Linköping University Norrköping SE‐60174 Sweden
2. Ligna Energy AB Box 787 Norrköping 601 74 Sweden
3. Department of Physics Chemistry and Biology (IFM) Linköping University Linköping SE‐58183 Sweden
4. Wallenberg Wood Science Center Department of Science and Technology (ITN) Linköping University Norrköping SE‐60174 Sweden