Artículos de revistas
Chemical (dis)order In A-si1-xcx:h For X<0.6
Registro en:
Physical Review B - Condensed Matter And Materials Physics. , v. 55, n. 7, p. 4426 - 4434, 1997.
1631829
2-s2.0-0000313422
Autor
Rovira P.I.
Alvarez F.
Institución
Resumen
We studied the local bonding structure of the hydrogenated amorphous silicon-carbon alloy system (a-Si1-xCx:H). The chemistry of the carbon incorporation in the alloys for 0<x<0.6 was analyzed by infrared and visible spectroscopies. The material was deposited in a controlled atmosphere of argon and hydrogen by rf cosputtering of Si and C targets. We found that up to x≈0.2 the carbon atom prefers to bond in a chemically disordered configuration, i.e., homonuclear bonds are favored. Between 0.2<x<0.6 a tendency to chemical ordering is apparent. These results are consistent with the behavior of the optical gap, the Urbach energy, and the density of defects of the material as a function of x. 55 7 4426 4434 Bullot, J., Schmidt, M.P., (1987) Phys. Status Solidi B, 143, p. 345 Anderson, D.A., Spear, W.E., (1977) Philos. Mag., 35, p. 1 Sussmann, R.S., Ogden, R., (1981) Philos. Mag. B, 44, p. 137 McKenzie, D.R., (1985) J. Phys. 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