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Spectroscopy of Metal Adsorbates on the GaAs(110) Surface Studied with the Scanning Tunneling Microscope

Published online by Cambridge University Press:  28 February 2011

R. M. Feenstra ,
P. MÅrtensson  and
R. Ludeke
R. M. Feenstra
Affiliation:
IBM Research Division, T. J. Watson Research Center, Yorktown Heights, New York 10598
P. MÅrtensson
Affiliation:
IBM Research Division, T. J. Watson Research Center, Yorktown Heights, New York 10598
R. Ludeke
Affiliation:
IBM Research Division, T. J. Watson Research Center, Yorktown Heights, New York 10598
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Abstract

The geometric and electronic structure of metal adsorbates on cleaved GaAs(l10) surfaces is studied with the scanning tunneling microscope. For the metals Sb and Bi, an ordered monolayer is formed, although in the case of Bi a series of misfit dislocations appear in the overlayer. In the case of Au, individual atoms are observed on the surface, forming clusters at higher metal coverage. Spectroscopic measurements reveal the presence of a state within the GaAs band gap. This state is observed near individual metal adsorbates (for Au and Sb), and near the edge of metal terraces (for Sb and Bi). The observed state is responsible for determining the position of the Fermi-level at the surface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 138: Symposium Q – Characterization of the Structure and Chemistry of Defects in Materials , 1988 , 305
Copyright
Copyright © Materials Research Society 1989

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