ELASTIC LATTICE DEFORMATION AND PIEZOELECTRIC FIELDS IN WURTZITE TYPEII-VI SEMICONDUCTOR HETEROSTRUCTURES

We theoretically investigate the strain and piezoelectric fields of la ttice mismatched semiconductor heterostructures made of materials with hexagonal crystallographic symmetry. Our model can be used in order t o determine the lattice deformation and the piezoelectric fields of ps eudomorphic as well as free-standing superlattices of wurtzite structu re. We consider and discuss the case of free-standing CdS/CdSe superla ttices with coherent heterointerfaces between the constituent superlat tice layers in detail. We show that our calculations correctly describ e the experimental evidences concerning the piezoelectric fields and a re in very good agreement with the measured data reported by M.P. Hals all et al. (C) 1997 Elsevier Science Ltd.