ИСТИНА

The modern molecular beam epitaxy technology with the use of computer control makes to design low-dimensional structures with a wide range of potential profiles. In this work, we study the thermoelectrically power of a nondegenerate two-dimensional electron gas in a complex shape quantum well for scattering of conduction electrons by acoustic and nonpolar optical phonons. The influence of the quantum well parameters, namely, the potential and width of the well, as well as the temperature and charge carriers concentration on the thermoelectric power is studied. It is shown that the thermopower of a nondegenerate two-dimensional electron gas nonmonotonically depends on the quantum well width: for narrow quantum wells (up to 10 nm) it magnitude sharply decreases, and for wide quantum wells, it increases, reaching saturation. The increasing of the quantum well potential leads to the thermopower sharply decreases, which is associated with localization of electrons in the quantum well. In the temperature range 100-400 K, the absolute value of the thermopower increases with increasing temperature (up 15%), while with increasing concentration, it significantly decreases.