1. Semiconductor Physics Institute, A. Goštauto 11, Vilnius, Lithuania
2. Vilnius Gediminas Technical University, Saulėtekio 11, Vilnius, Lithuania
3. French-German Research Institute of Saint Louis (ISL), 5, rue Général Cassagnou, F-68301 Saint-Louis, France
4. Gelsenkirchen University of Applied Sciences, Neidenburger Str. 10, D-45877 Gelsenkirchen, Germany
5. Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania