Diffusion and Phonon Drag Thermopower of Two-Dimensional Hole Gas in an AlGaAs-GaAs Heterojunction

Abstract

A study of the thermoelectric power of the two-dimensional hole gas for both diffusion and phonon drag effects has been presented in this paper. Diffusion thermopower has been calculated using Boltzmann's transport equation and constant density of states function. The phonon drag thermopower has been estimated from a simple formula suggested by Smith and Butcher which is valid for piezoelectric as well as acoustic phonon scattering of non-degenerate hole gas at low temperatures. The effect of phonon mean free path on the phonon drag thermopower has also been studied.