Relationship between the lateral length and thickness of the platelets in naturally occurring strained layer superlattice structures

Ian T. Ferguson, Andrew G. Norman, Tae Yeon Seong

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The molecular beam epitaxial growth of InAs0.5Sb0.5 onto (001) surfaces below 430°C results in the formation of a "natural" strained layer superlattice (n-SLS). Transmission electron micrographs of 〈110〉 cross sections showed the existence of two different alloy compositions that formed a tetragonally distorted interleaved platelet structure in which the interfaces were highly regular and ran approximately parallel to the growing surface. It is found that the structure of the n-SLS can be changed systematically by carefully controlling the InAs0.5Sb0.5 growth conditions. A simple relationship is derived relating the lateral size of the platelet to its thickness that is found to hold experimentally for n-SLS structures. It is suggested that the n-SLS structure occurs because it corresponds to the minimum free energy configuration of the growing crystal. A similar formalization has been applied to periodic modulations in other material systems.

Original languageEnglish
Pages (from-to)5733-5736
Number of pages4
JournalJournal of Applied Physics
Issue number10
Publication statusPublished - 2000 Nov 15


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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