Variational method study of quantum-confined Stark effect in the Zn_(1-x)Cd_xSe/ZnSe quantum well

The variation method was used to calculate the lowest eigenenergy of electrons and holes and the binding energy of excitons in Ⅱ Ⅵ quantum well Zn 0.8 Cd 0.2 Se/ZnSe for different well widths and different electric fields. The obtained data on E e, E h and E b were used to compute the Stark shift of the exciton absorption peak. The theoretical results showed that the Stark effect becomes more remarkable with the increase of the electric field and well width. Comparison of the calculated Stark shift with the experimental value obtained from the absorption line shape showed good agreement when well width was about 9 nm and the electric field was about 100 kV/cm.