Frank dislocation loops in HgTe/CdTe superlattices on CdTe/Si(211) B substrates

The defect structures in HgTe/CdTe superlattices (SLs) on CdTe/Si(211) B substrates grown by molecular-beam epitaxy have been investigated using (scanning) transmission electron microscopy and electron energy loss spectroscopy. Straight Hg-rich defects perpendicular to the SLs have been observed near the substrate while Frank dislocation loops (FDLs) are seen far from the substrate. The Hg-rich defects exhibit only a compositional variation with no significant atomic shift, and can be considered to be a remnant of a FDL which has climbed by thermal diffusion during the growth. © 2008 American Institute of Physics.

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Author Miaofang Chi Thomas Lord Department of Mechanical Engineering and Materia ...