Enhanced electron density in two Si ?-doped Al0.33Ga0.67As/GaAs heterojunctions
We have investigated the electronic properties of the ?-doped Al0.33Ga0.67As/GaAs heterojunction such as the electron density. We have also examined the case where the ?- doping is placed in a thin AlxGa1?xAs quantum well embedded in the Al0.33Ga0.67As barrier. This is intended to reduce the DX centers effects. In this context, we have grown a series of silicon ?-doped Al0.33Ga0.67As/GaAs heterostructures having various alloy compositions in the AlxGa1?xAs quantum well (xAlwell). Hall measurements were performed on these samples in the temperature range 4300K. A self-consistent analysis (Schrdinger and Poisson equations) is made on these silicon ?-doping systems. Moreover, a comparison between the theoretical and experimental results shows an agreement between them.
quantum well dx center effect hall measurements