Abstract
The exciton binding energy in Cd0.11Zn0.89S/Mg0.22Zn0.78S single quantum wells (SQWs) is calculated to study their exciton properties in detail. The heavy-hole exciton binding energy is larger than the light-hole exciton binding energy in narrow wells, because the degree of confinement of heavy-hole excitons is larger than that of light-hole excitons in these SQWs. The heavy- and light-hole exciton binding energies are found to increase owing to the image-charge effect when the well width is less than 5 nm.
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