1. Institute of Electron Technology; Al. Lotników 32/46 02 668 Warszawa Poland
2. Department of Electronics Fundamentals; Rzeszów University of Technology; W. Pola 2 35 959 Rzeszów Poland
3. Faculty of Materials Science and Engineering; Warsaw University of Technology; Wołoska 141 02 507 Warszawa Poland
4. Compound Semiconductor Technologies; Glasgow G20 0SP Scotland