Journal
JOURNAL OF APPLIED SPECTROSCOPY
Volume 78, Issue 2, Pages 223-227Publisher
SPRINGER
DOI: 10.1007/s10812-011-9450-9
Keywords
amorphous semiconductors; electron density of state distribution; Kubo-Greenwood formula; Davis-Mott approximation; types of electronic optical transitions; absorption spectrum; Urbach energy
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Formulas are derived for the Urbach energy as a function of the parameters controlling the slope of the exponential tails in the valence and conduction bands of amorphous semiconductors. It is shown that the Urbach energy remains constant, even if one of these parameters varies over a wide range.
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