A composite comprises a substrate of monocrystalline structure which is either a hexagonal, cubic, rhombohedral or orthorhombic, and a monocrystalline layer on the substrate of a JQ compound formulation wherein J is at least one element selected from the group consisting of cadmium, zinc and mercury, and wherein Q is at least one element selected from the group consisting of sulfur, tellurium, selenium and/or oxygen. An alkyl or hydride type dopant may be used to provide a homogeneously doped layer. Processes for making the layer composition and for making the composite are described.