Effects of Nonparabolicity on Electron Thermopower of Size-Quantized Semiconductor Films


Bahsheli G., Akbar B. C. , Novruz B., Genber K.

CHINESE PHYSICS LETTERS, vol.32, no.7, 2015 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 32 Issue: 7
  • Publication Date: 2015
  • Doi Number: 10.1088/0256-307x/32/7/077204
  • Title of Journal : CHINESE PHYSICS LETTERS

Abstract

Effects of nonparabolicity of energy band on thermopower, in-plane effective mass and Fermi energy are investigated in size-quantized semiconductor films in a strong while non-quantized magnetic field. We obtain the expressions of these quantities as functions of thickness, concentration and nonparabolicity parameter. The influence of nonparabolicity is studied for degenerate and non-degenerate electron gases, and it is shown that nonparabolicity changes the character of thickness and the concentration dependence of thermopower, in-plane effective mass and Fermi energy. Moreover, the magnitudes of these quantities significantly increase with respect to the nonparabolicity parameter in the case of strong nonparabolicity in nano-films. The concentration dependence is also studied, and it is shown that thermopower increases when the concentration decreases. These results are in agreement with the experimental data.