1. Biomolecular and organic electronics; IFM, Linköping University; S-581 83 Linköping Sweden
2. Institute of Chemistry and Technical Electrochemistry; Poznan University of Technology; Piotrowo 3 60-965 Poznan Poland
3. Department of Physics; Chemistry and Biology, IFM, Linköping University; S-581 83 Linköping Sweden