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Disorder and Urbach energy in hydrogenated amorphous carbon: A phenomenological model
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Typical absorption coefficients measured by photothermal deflection spectroscopy (Refs. 9 and 10) and (b) the related , extracted by Eq. (1), for and polymer-like samples.

Image of FIG. 2.
FIG. 2.

Relationship between Tauc gap and disorder-measuring parameters in (a) Disorder-induced narrowing factor of the Tauc gap , also representing the inverse of the aspect ratio of the Gaussian . Data from Refs. 8–13. The dotted curve fits an exponential decay and we use it to compare Raman and optical data of different data sets (Refs. 8–15) at similar Tauc gaps, preparation conditions and hydrogen contents. We do not assign any physical meaning to such a curve. (b) Raman -peak linewidth recorded at , representing the structural disorder. The continuous line fits the model as in Eq. (5). The dotted line represents the model only considering structural disorder (suitable for polymer-like samples: ).

Image of FIG. 3.
FIG. 3.

Mutual relationship between conventional optical parameters in . (a) Tauc gaps and (b) Urbach energies vs . The continuous line in (b) represents the model for graphite-like and diamond-like samples at constant Gaussian width , given by Eq. (8a), the dotted line represents the model for polymer-like samples at slowly varying Gaussian intensity (i.e., slowly varying ), given by Eq. (8b). Data from Refs. 8–13.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Disorder and Urbach energy in hydrogenated amorphous carbon: A phenomenological model