TY - JOUR
T1 - Direct imaging of CdTe(001) surface reconstructions by high-resolution electron microscopy
AU - Lu, Ping
AU - Smith, David
N1 - Funding Information:
This work has been supported by National Science Foundation Grant No. DMR-8514583. We are grateful to Dr. A. Schwartzmann and Dr. R. Sinclair for providing the CdTe materials.
PY - 1991/8/2
Y1 - 1991/8/2
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0026205767&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0026205767&partnerID=8YFLogxK
U2 - 10.1016/0039-6028(91)90644-8
DO - 10.1016/0039-6028(91)90644-8
M3 - Article
AN - SCOPUS:0026205767
SN - 0039-6028
VL - 254
SP - 119
EP - 124
JO - Surface Science
JF - Surface Science
IS - 1-3
ER -