Investigação do espalhamento dos electrões em L1 e ∆1 mínimos de germânio

Abstract

The investigation of the properties of electrons in the energetic minimums, relatively distant in the energy scale in relation to the absolute energetic minimums in the Brillouin band, has acquired a special interest due to the investigation of the warming phenomena of the charge carriers. The classic uniaxial deformation (DEU) of the crystals allows creating favorable experimental conditions for direct measurement of the properties of the electrons in these minima. In the presented work, it is theoretically considered L1 - Δ1 Germanium model. The DEU applied along the crystallographic direction [001] allows to consider the inversion of the minimum L1 and Δ1 of Germanium and thus allows investigating the electron scattering in minimum L1 and Δ1 separately. Based on the anisotropic scattering theory (TEA), the expressions for the electrical conductivity tensor, electrical resistivity tensor and electron mobility had been obtained and analyzed numerically, in the model considered (n-Ge) under the conditions of electron scattering by phenons acoustic and impurity ions (scattering misito), using the Pascal programs specially designed for this purpose. The comparison of the theoretical results and the experimental data allowed to determine the effective masses of the electrons, constant of the deformation potentials and the anisotropy parameter and Germanium minimums. (TRADUÇÃO NOSSA)