Abstract
We have used the empirical tight-binding method within the antibonding orbital model to compute the self-consistent potential profile and Fermi level position in -type -doped . This model describes the six valleys in the conduction band adequately. We include exchange-correlation effects under the local density approximation. The comparison of our results to empirical pseudopotential calculations shows very good agreement, while effective mass approximation calculations agree only in the low doping regime. At ultra high densities, an oscillatory behavior of the Fermi-level position as a function of the doping concentration is predicted.
- Received 2 May 2005
DOI:https://doi.org/10.1103/PhysRevB.72.125330
©2005 American Physical Society