Features of the effect of heterointerface spreading on exciton states in Zn(Cd)Se/ZnMgSSe quantum wells

The exciton states in Zn(Cd)Se/ZnMgSSe quantum wells with various degrees of diffusive spreading of interfaces are studied by optical spectroscopy methods. Luminescence lines of free excitons are identified. It is shown that, in addition to exciton level shift, heterointerface spreading enhances exciton-phonon coupling and increases the energy shift between maxima of emission lines of free and bound excitons. The major causes of the observed phenomena are discussed.