Abstract
Abstract In this work, we investigated different hydrogenated amorphous carbon (a-C:H) films grown by radio frequency (RF) magnetron sputtering covering a large variety of films from polymer-like carbon (PLC) to diamond-like carbon (DLC). Photothermal deflection spectroscopy (PDS), transmission spectroscopy in the visible and near infrared (IR) region were combined with electron spin resonance (ESR) measurements. The optical absorption spectra were analysed assuming a distribution of two overlapping Gaussian bands near the Fermi level in order to deduce the density of states (DOS) at the Fermi level. From the DOS and the density of paramagnetic states a correlation energy for midgap states is derived.
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