Abstract
Optical absorption (\ensuremath{\sim}1--5 eV) in rf-deposited hydrogenated (20--40 at. %) amorphous ``diamondlike'' carbon films has been studied as a function of heat treatment. For E\ensuremath{\gtrsim}2.5 eV a Tauc behavior is exhibited. Optical band gaps ${E}_{g}$ are \ensuremath{\lesssim}2.4 eV. At lower energies, band tailing with an Urbach focus is found. ${E}_{0}$, the width of the tail, is quantitatively explained in terms of the annealing temperature ${T}_{H}$. Increasing ${T}_{H}$ (<700 K) reduces the hydrogen content, lowers ${E}_{g}$, and appears to harden the films. ${E}_{g}$ is determined to be a linear function of ${E}_{0}$. Additional analysis was performed in terms of a divergence temperature, ${T}_{0}$; the results of this analysis are comparable to those observed in a-Si:H.
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