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 semiconductorselectron density of state distributionKubo–Greenwood formulaDavis–Mott approximationtypes of electronic optical transitionsabsorption spectrumUrbach energy

Copyright information

© Springer Science+Business Media, Inc. 2011