Diffusion thermopower of the two-dimensional electron gas in GaN single quantum wells

Diffusion thermopower ( S d ) of the two-dimensional (2D) electron gas in GaN single quantum wells is calculated in the temperature range 1 K–12 K using the Fermi–Dirac distribution function. Scattering of carriers through acoustic phonons via deformation potential and piezoelectric couplings, and through background and remote ionized impurities is included. S d is found to decrease with temperature and the 2D electron concentration, and is primarily controlled by deformation potential acoustic scattering. The dependence of S d on the well width and the ionized impurity concentration is found to be quite weak.