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

Ping Lu, David Smith

    Research output: Contribution to journalArticlepeer-review

    26 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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