Answer to Question #163097 in Electrical Engineering for Mital sosa

Question

What is meant by lattice mis-fit? How this parameter is important for the deposition of epitaxy layer of a desired semiconductor thin film? Answer with suitable example.

Answer 1

Lattice mis-fit is a situation where two materials featuring different lattice constants are brought together by deposition of one material on top of another.

Lattice mismatch is important as it will prevent growth of defect-free epitaxial film unless thickness of the film is below certain critical thickness.

An example of lattice mis-fit is that of lattice mismatch at the interface of a InAs epi-layer and a GaAs substrate.