Correlation of the optical gaps and Raman spectra of hydrogenated amorphous carbon films

Tamor, M. A.; Haire, J. A.; Wu, C. H.; Hass, K. C.
January 1989
Applied Physics Letters;1/9/1989, Vol. 54 Issue 2, p123
Academic Journal
The Raman and infrared absorption spectra, optical gaps, and electron spin densities of amorphous carbon films deposited from hydrocarbon plasmas have been systematically studied as a function of deposition conditions and Raman probe wavelength. Although all other probes are consistent with a monotonic increase in intermediate-range order with substrate bias voltage Vb, the optical gap decreases with increasing Vb (consistent with increasing graphitic domain size) only up to the onset of sputtering, where the gap sharply increases. We propose a simple structural model for a-C:H which is consistent with these results and requires no sp3 bonding.


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