Impurity binding energy in polar quantum dot with finite potential barriers

The impurity binding energy in the absence and in the presence of confined LO-phonon interaction in a cubic quantum dot for several values of the mass ratio A and for several heights of the barrier has been calculated using a variational approach. The quantum confinement is described by a finite pot ential well. The charge carrier (electron and ion)-phonon coupling is treat ed within the adiabatic approximation. The results show that this effect in creases, reaches a peak value and then decreases as the dot size increases and depends strongly on the impurity position. The confined LO-phonon effec t decreases by displacing the impurity from the center to the dot boundary.