Patent ID: 7387953

Claim:
A method for forming a laminated layer structure that comprises: providing a substrate, growing a layer of a material comprising at least two compounds A x and B (1-x) with a gradient composition A xg B (1-xg) , such that the composition parameter (1-xg) gradually increases over the thickness of the layer, growing a subsequent layer of a material A xs B (1-xs) on the layer of a material A x B (1-x) having a gradient composition A xg B (1-xg) , and repeating the two preceding steps one or more times to build a stack of layers of the material A x B (1-x) , wherein compound A has a lattice parameter being sufficient to allow homo- or heteroepitaxial growth of compound A on the substrate, and wherein x is a composition parameter that is above 0 to less than 1 (o<x<1), choosing growth parameters at an interface between a layer having a gradient composition and a subsequent layer such that the composition parameter (1-xs) of the subsequent layer is smaller than the composition parameter (1-xg) of the layer having a gradient composition.