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Behaviour of surface states on a GaAs/AlGaAs heterostructure investigated by capacitance spectroscopy

✍ Scribed by K. Ali; E. Skuras; S. Vallis; A.R. Long; I.A. Larkin; J.H. Davies; M.C. Holland; A.Abd-El Mongy

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
42 KB
Volume
25
Category
Article
ISSN
0749-6036

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✦ Synopsis

Low temperature depletion capacitance-voltage data, taken from a novel open design of surface superlattice fabricated on a GaAs/AlGaAs heterostructure, are compared with two theoretical models. These assume either that the Fermi level on the free semiconductor surface is pinned, or that the surface charge state is unaltered (frozen) when the superlattices are biased. The data are in much better agreement with the frozen surface model.

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