Journal of Applied Spectroscopy

, Volume 78, Issue 2, pp 223-227

First online:

Urbach energy and the tails of the density of states in amorphous semiconductors

  • S. ZaynobidinovAffiliated withAndijan State University
  • , R. G. IkramovAffiliated withNamangan State University Email author 
  • , R. M. JalalovAffiliated withNamangan State University

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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.


amorphous semiconductors electron density of state distribution Kubo–Greenwood formula Davis–Mott approximation types of electronic optical transitions absorption spectrum Urbach energy