1. Department of Physical Electronics Herzen State Pedagogical University of Russia 48 Moïka Emb. St Petersburg 191186 Russia
2. Nanoelectronics Research Institute National Institute of Advanced Industrial Science & Technology (AIST) Higashi 1-1-1 Tsukuba Central 5 Ibaraki 305-8565 Japan
3. Center of Materials and Nanotechnologies Faculty of Chemical Technology University of Pardubice Nam. Čs. Legii 565 530 02 Pardubice Czech Republic