1. Department of Organic Chemistry, Kaunas University of Technology, Radvilenu pl. 19, Kaunas, 50254, Lithuania
2. Institute of Solid State Physics, University of Latvia, Kengaraga st. 8, Riga, LV-1063, Latvia
3. Center for Physical Sciences and Technology, Sauletekio Ave. 3, 10257, Vilnius, Lithuania
4. Department of Material and Environmental Technology, Tallinn University of Technology, Ehitajate tee 5, Tallinn, 19086, Estonia
5. Department for Solar Energy, Institute for Energy Technology, PO BOX 40, 2027, Kjeller, Norway