Gaussian interpretation of the optical absorption edge tail in amorphous hydrogenated carbon a-C:H

Optical, electronic, and microstructural properties of mixed phase RF magnetron sputtered vanadium oxide thin films on quartz and aluminized quartz

“…It is observed that for the polymer materials, the optical absorption edge tail is directly proportional to the density-of-state distributions below the band gap. 35 Thus, the following modified Urbach equation is introduced by taking into consideration the above perception to simulate the optical absorption data.…”

Mg:TiO2 alloy thin films based MOS capacitors grown on GaAs substrates

“…P. Mikulski et al [37] reported that for amorphous hydrogenated carbon films a Gaussian plot instead of Urbaeh law was found to be useful for the interpretation of lower part of the optical edge. Such a characteristic of the optical absorption edge tail is directly proportional to the density-of-state distributions below the band-edge [37] as observed for the polymer materials.…”

The optical absorption edge of diamond-like carbon: A quantum well model

“…Finally, Mikulski and co-workers developed a formulation based on transitions between bonding and antibonding states within the graphitic clusters, consistent with the Robertson model. 7 However, they, too, use a cluster size distribution that is based more on convenience than on physical reality. All three models, in other words, begin with certain aspects of the Robertson model, but then introduce ad hoc assumptions.…”