1. Biomolecular and Organic Electronics; IFM, and Center of Organic Electronics; Linköping University; SE-581 83 Linköping Sweden
2. Laboratory of Photonics and Interfaces; Swiss Federal Institute of Technology (EPFL); Station 6 Lausanne CH 1015 Switzerland
3. Surface Physics and Chemistry, IFM; Linköping University; SE-581 83 Linköping Sweden