Can we calculate the direct and indirect band gaps (Urbach energy too) for the amorphous materials e.g. transparent glasses according to Mott-Davis?

03 April 2013 1 4K Report

References:

1) N.F. Mott, E.A. Davis, Philos. Mag. 28 (1970) 903.

2) F. Urbach, Phys. Rev. 92 (1953) 1324.

Of course there are many published papers based on this method. But the question is, are they really reliable/reasonable for non-semiconducting glasses?

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