Effect of annealing on the surface characteristics of α-Al2O3(0001) probed by XPS

Ganga Babu Geetha; Carmel Dansou; Emanuela Carleschi; Bryan P. Doyle

doi:10.1116/1.5084239

Effect of annealing on the surface characteristics of α-Al₂O₃(0001) probed by XPS

Ganga Babu Geetha, Carmel Dansou, Emanuela Carleschi, Bryan P. Doyle

Physics

University of Johannesburg

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

α-Al₂O₃(0001) is a technologically important metal oxide substrate used in current solid state electronic devices. This report presents the effect of heat treatment on the surface electronic structure characteristics of α-Al₂O₃(0001) substrates examined by x-ray photoelectron spectroscopy. Survey spectra, O 1s, Al 2p, Al 2s core levels, and valence band spectra are presented for the as received, vacuum annealed, and oxygen annealed substrates. Annealing removes various contaminants such as C, Zn, and OH groups from the surface, and a sharp (1 × 1) low energy electron diffraction pattern confirms the ordered hexagonal periodicity of the surface. No substantial differences in the valence band spectra are observed due to annealing and suggest that the (1 × 1) surface characteristics of α-Al₂O₃(0001) are preserved during the surface cleaning procedures.

Original language	English
Article number	014014
Journal	Surface Science Spectra
Volume	26
Issue number	1
DOIs	https://doi.org/10.1116/1.5084239
Publication status	Published - 1 Jun 2019

ASJC Scopus subject areas

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films

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abstract = "α-Al2O3(0001) is a technologically important metal oxide substrate used in current solid state electronic devices. This report presents the effect of heat treatment on the surface electronic structure characteristics of α-Al2O3(0001) substrates examined by x-ray photoelectron spectroscopy. Survey spectra, O 1s, Al 2p, Al 2s core levels, and valence band spectra are presented for the as received, vacuum annealed, and oxygen annealed substrates. Annealing removes various contaminants such as C, Zn, and OH groups from the surface, and a sharp (1 × 1) low energy electron diffraction pattern confirms the ordered hexagonal periodicity of the surface. No substantial differences in the valence band spectra are observed due to annealing and suggest that the (1 × 1) surface characteristics of α-Al2O3(0001) are preserved during the surface cleaning procedures.",

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Effect of annealing on the surface characteristics of α-Al₂O₃(0001) probed by XPS

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