1. National Institute for Research and Development in Electrical Engineering ICPE—CA Bucharest, 030168 Bucharest, Romania
2. Department of Electrical Measurements and Materials, Gheorghe Asachi Technical University, 700050 Iasi, Romania
3. National Research and Development Institute for Optoelectronics INOE 2000—IHP Bucharest, 077125 Măgurele, Romania
4. Department of Inorganic Chemistry, Physical Chemistry and Electrochemistry, National University of Science and Technology—Politehnica Bucharest, Splaiul Independentei No. 313, 060042 Bucharest, Romania