1. Department of Organic Chemistry; Kaunas University of Technology; Radvilenu pl. 19 Kaunas LT-50254 Lithuania
2. Institute for Silicon Photovoltaics; Helmholtz-Zentrum Berlin; Young Investigator Group for Perovskite Tandem Solar Cells; Kekuléstr. 5 Berlin D-12489 Germany
3. Department of Organic Chemistry; Center for Physical Sciences and Technology; Sauletekio Ave. 3 Vilnius LT-10257 Lithuania