Journal of Applied Spectroscopy

, Volume 78, Issue 2, pp 223–227

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


  • S. Zaynobidinov
    • Andijan State University
    • Namangan State University
  • R. M. Jalalov
    • Namangan State University

DOI: 10.1007/s10812-011-9450-9

Cite this article as:
Zaynobidinov, S., Ikramov, R.G. & Jalalov, R.M. J Appl Spectrosc (2011) 78: 223. doi:10.1007/s10812-011-9450-9

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

Copyright information

© Springer Science+Business Media, Inc. 2011