1. Department of Electronic Engineering, Institute of Telecommunications, Radioelectronics and Electronic Engineering, Lviv Polytechnic National University, Stepan Bandera st. 12, Lviv 79013, Ukraine
2. Kaunas University of Technology, Baršausko 59, Kaunas 51423, Lithuania
3. Ivan Franko National University of Lviv, Kyryla i Mefodiya 6, Lviv 79000, Ukraine
4. Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Norrköping SE-60174, Sweden