Molecular beam epitaxial growth and optical properties of (001) HgTe/Hg1-xCdxTe superlattices

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Abstract
The experimental optical absorption coefficient of HgTe/Hg0.32Cd0.68Te superlattices with a wide range of well and barrier widths have been compared with theoretical calculations. There is good agreement with experiment if the Cd concentration profile across the as-grown interfaces is assumed to have the shape given by an error function together with an additional Cd concentration of 3% in the quantum wells. The latter concentration was experimentally confirmed. If diffusion is responsible for this concentration profile then a dependence on depth should be present, however, none was observed. Therefore the Cd concentration profile across the interfaces of an as-grown HgTe/Hg0.32Cd0.68Te superlattice does not result from interdiffusion of the interfaces during growth. In other words, growth mechanisms do not involve interdiffusion of the interfaces.

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