Direct imaging of CdTe(001) surface reconstructions by high-resolution electron microscopy

Ping Lu, David Smith

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

Novel reconstructions of the CdTe(001) surface have been directly observed using high-resolution electron microscopy in the profile-imaging geometry. The CdTe(001) surface, obtained by in situ annealing under ultrahigh vacuum conditions, is found to have a (2 × 1) structure at temperatures of less than about 200° C, but it transforms reversibly into a (3 × 1) structure at temperatures above 200 °C. Structural models for the reconstructions have been proposed and confirmed by extensive computer simulations. The (2 × 1) reconstruction, stabilized by Cd atoms, consists of a 1 2 monolayer of Cd vacancies and a large inward relaxation of the remaining surface Cd atoms, similar to the (2 × 1) reconstruction previously proposed for the GaAs(001) surface. The (3 × 1) reconstruction, stabilized by Te atoms, involves formation of surface dimers and the presence of vacancies. In both reconstructions, atomic displacements are observed that extend a few layers into the bulk and serve to reduce the strain energy.

Original languageEnglish (US)
Pages (from-to)119-124
Number of pages6
JournalSurface Science
Volume254
Issue number1-3
DOIs
StatePublished - Aug 2 1991

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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