Nitrogen Effects on Optical and Electrical Properties of Amorphous Carbon
Optical and electrical properties amorphous carbon nitride (a-CN) has been investigated on films deposited by reactive R.F. sputtering source with a graphite target. The amorphous carbon nitride samples were prepared under a gas mixture of nitrogen (N2) and /or Argon (Ar).The optical transitions are governed by the and * electronic state distributions, related to sp2- and sp1-hybridized C and N atoms. Specific lonepair electronic states arise from groups (CN) with sp1-hybridized C atoms, which may form C≡N triple bonds or —N=C=N— longer chains. Photoluminescence spectra show a maximum around 650 nm. Two conduction regimes at high and low temperature are found in a-CN samples. The corresponding activation energies decrease with the increase of target voltage.
Luís Guerra ROSA and Fernanda MARGARIDO
M. Fathallah et al., "Nitrogen Effects on Optical and Electrical Properties of Amorphous Carbon", Materials Science Forum, Vols. 636-637, pp. 423-429, 2010