1. Laboratory of Thin Film Chemical Technologies, Department of Materials and Environmental Technology, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia
2. Department of Organic Chemistry, Kaunas University of Technology, Kaunas LT-50254, Lithuania
3. Institute of Solid State Physics, University of Latvia, Kengaraga Str. 8, Riga, Latvia
4. Institute for Energy Technology (IFE), P. O Box 40, No 2027, Kjeller, Norway