1. Laboratory of Organic Electronics Department of Science and Technology (ITN) Linköping University Norrköping SE‐601 74 Sweden
2. Terahertz Materials Analysis Center (THeMAC) Department of Physics Chemistry and Biology (IFM) Linköping University Linköping SE‐581 83 Sweden
3. Center for III‐Nitride Technology C3NiT‐Janzèn Department of Physics Chemistry and Biology (IFM) Linköping University Linköping SE‐581 83 Sweden
4. RISE Research Institutes of Sweden Bio‐ and Organic Electronics Bredgatan 35 Norrköping SE‐602 21 Sweden