Defect structure at a CdTe(111) GaAs(001) interface

J. E. Angelo, William W Gerberich, G. Bratina, L. Sorba, A. Franciosi

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2 Scopus citations

Abstract

This paper addresses the defect structure, as observed by transmission electron microscopy, at a CdTe(111) GaAs(001) interface. When viewed along the [11̄0]CdTe direction, the overlayer exhibits a high density of microtwins parallel to the CdTe(111) growth direction. Meanwhile, when viewed along [112̄]CdTe, an array of misfit dislocations, exhibiting edge component of Burgers vector equal to a 4[ 1 ̄10], a = 6.48 A ̊, are observed at the interface between the CdTe and GaAs lattices. These misfit dislocations are of such a spacing as to be consistent with only partial relief of the misfit strain. The residual misfit strain is found to relax in a region extending about 200 Å from the interface, with the source of the strain relief being layer dislocations in the CdTe overlayer. The distance over which the misfit relaxes is consistent with the results of X-ray measurements of the misfit relaxation in thin overlayers. Furthermore, the distance over which the misfit relaxes is the same as that which the high density of microtwins are observed, suggesting that the microtwins act as nucleation sites for the observed layer dislocations.

Original languageEnglish (US)
Pages (from-to)117-121
Number of pages5
JournalThin Solid Films
Volume271
Issue number1-2
DOIs
StatePublished - Dec 15 1995

Keywords

  • Cadmium telluride
  • Gallium arsenide
  • Interfaces
  • Transmission electron microscopy

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