[2] Robertson J. The electronic and atomic structure of hydrogenated amorphous Si-Nalloys. Philos. Mag. B, 1991, 63: 47
[5] Karcher R, Ley L et al. Electronic structure of hydrogenated and unhydrogenatedamorphous SiNx, a photoemission study. Phys. Rev., 1994, B30: 1896
[6] Meauder R et al. Conduction-band tail width and minimum metallic conductivity ina-SixN1-x: H films studied by photoconduction and opticalabsorption. Phil. May. B, 1984, 50: 63