Effect of Chemical Passivation of GaAs(001) Surface on Anisotropy and Orientation of Gold Nanoclusters Formed on It and Their Plasmons

The principal role of chemical passivation of GaAs surface in the formation on it of oriented anisotropic nanoclusters of gold is discussed. The nanoclusters are fabricated by thermal annealing of a gold film deposited onto GaAs(001) surface passivated as a preliminary by a monolayer of nitrogen or...

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Bibliographic Details
Published in:Semiconductors (Woodbury, N.Y.) N.Y.), 2023-04, Vol.57 (4), p.216-220
Main Authors: Berkovits, V. L., Kosobukin, V. A., Ulin, V. P., Alekseev, P. A., Soldatenkov, F. Yu, Levitskii, V. A.
Format: Article
Language:English
Subjects:
Anisotropy
Annealing
Chemical bonds
Crystal lattices
Crystal surfaces
Gallium arsenide
Gold
Magnetic Materials
Magnetism
Nanoclusters
Nitrogen
Optical properties
Passivity
Physics
Physics and Astronomy
Plasmons
Reflectance anisotropy spectroscopy
Reflection
Spectrum analysis
Sulfur compounds
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Summary:The principal role of chemical passivation of GaAs surface in the formation on it of oriented anisotropic nanoclusters of gold is discussed. The nanoclusters are fabricated by thermal annealing of a gold film deposited onto GaAs(001) surface passivated as a preliminary by a monolayer of nitrogen or sulfur atoms. These atoms, bonded chemically to gallium atoms of the crystal surface, form a crystal lattice and prevent the chemical interaction of Au with GaAs. As a result of annealing, the arrays of anisotropic (elongated) nanoclusters of chemically pure Au oriented preferably in crystal direction are formed on passivated GaAs(001) surface. The presence of strong anisotropy and orientation of Au clusters on passivated GaAs surfaces is established by the methods of probe diagnostics and of optical reflectance anisotropy spectroscopy and polarized reflection spectroscopy. Using an optical model of plasmonic polarizability of elongated Au spheroids, it is shown that the spectral features observed in polarized reflection originate from anisotropic plasmons of Au nanoclusters polarized mainly in direction of crystal.
ISSN:1063-7826
1090-6479
DOI:10.1134/S1063782623070060