ELECTRONIC-PROPERTIES OF (ZNSE)(M)(CD(1)-X)ZN(X)SE)(N) SUPERLATTICES

We present theoretical calculations on the electronic structures of (Z nSe)m(Cd1-xZnxSe)n superlattices. First-principle pseudopotential calc ulations are performed to obtain the valence-band offset for CdSe grow n on ZnSe. We then use an empirical nonlocal pseudopotential method, i ncluding the spin-orbit interaction to calculate the band structures a nd effective masses of (ZnSe)m(Cd1-xZnxSe)n superlattices grown on ZnS e. The empirical pseudopotentials are taken to be linear combinations of Gaussian functions with a few adjustable parameters. The parameters of ZnSe and CdSe are fitted to available experimental data. The effec ts of strain due to lattice mismatch have been properly taken into acc ount. We have also studied the band pp as a function of composition an d layer thicknesses of constituent materials in superlattices. The res ults are in agreement with recent experimental data.