A new method for determining the density distribution of electronic states on the tail of the valence band of amorphous semiconductors Se$_{x}$S$_{1-x}$

The analytical expression and the experimental curve of the spectrum of the exponential absorption of amorphous selenium-sulfur solid solution (Se$_{0.5}$S$_{0.5}$ and Se$_{0.7}$S$_{0.3}$). Analytical parameters the expression for the exponential absorption spectrum, which determine the curvature of the exponential tails allowed bandes are found by approximating the experimental curve. Using the approximation Davis–Mott, using the Kubo–Greenwood formula for the exponential absorption spectrum, a new formula that determines the density of electronic states in the tail of the valence band. Using this formula and the experimentally determined spectrum of exponential absorption shows the possibility of determination of the density of electronic states in the tail of the valence band.