Kubo-greenwood Formula For The Exponential Absorption Region Of Amorphous Semiconductors And Distribution Of The Density Of Electronic States In The Tail Of The Conduction Band

Abstract

The region of exponential absorption of the spectra of amorphous semiconductors is theoretically investigated using the Davis-Mott approximation method from the Kubo-Greenwood formula. Analytical expressions for the partial absorption spectra for the exponential region are derived from two different types of the KuboGreenwood formula. A new method is presented for calculating the distribution density of electronic states in the tails of the conduction band of amorphous semiconductors based on the analytical expression for experimental exponential absorption spectra. The density of electronic states in the tail of the conduction band of an amorphous solid selenium-sulfur alloy is determined from the experimental exponential absorption spectrum of this material.

Keywords

• exponential region of absorption spectra
• partial absorption spectra
• tail of the conduction band
• distribution of the density of electronic states