Technical Chemistry, Department of Chemistry, Chemical-Biological Centre, Ume(a)University, 5E-901 87 Ume(a), Sweden;
Department of Physics, Ume(a)University, SE-901 87 Ume(a), Sweden;
Department of Physics, Ume(a)University, SE-901 87 Ume(a), Sweden;
Technical Chemistry, Department of Chemistry, Chemical-Biological Centre, Ume(a)University, 5E-901 87 Ume(a), Sweden;
Microelectronics and Materials Physics Laboratories, Department of Electrical Engineering, University of Oulu, P.O.Box 4500, Oulu FI-90014, Finland;
Microelectronics and Materials Physics Laboratories, Department of Electrical Engineering, University of Oulu, P.O.Box 4500, Oulu FI-90014, Finland;
Microelectronics and Materials Physics Laboratories, Department of Electrical Engineering, University of Oulu, P.O.Box 4500, Oulu FI-90014, Finland;