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Term (Index) Definition
lattice mismatch  term refers to the situation where two materials featuring different lattice constants are brought together by deposition of one material on top of another; in general, lattice mismatch will prevent growth of defect-free epitaxial film unless thickness of the film is below certain critical thickness; in this last case lattice mismatch is compensated by the strain in the film.
pseudomorphic material  term concerns lattice-mismatched heterostructures; psuedomorphic film is a layer of single-crystal material on single-crystal substrate featuring slightly different chemical composition, and hence, slightly different lattice constant; lattice mismatch is accommodated by strain in the film; thinner than certain critical thickness (hc)above which stress in the film is released by formation of dislocation.
strained layer supperlattice, SLS  a structure comprising of several epitaxial layers of lattice mismatched materials thin enough to avoid formation of dislocation (pseudomorphic films); strain affects electronic properties of materials involved; by controlling thickness of each film and its chemical composition the SLS structures can be designed to perform several unusual electronic and photonic functions in various device configurations.
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