DPG Phi
Verhandlungen
Verhandlungen
DPG

Hamburg 2001 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

O: Oberflächenphysik

O 23: Oxide und Isolatoren (I)

O 23.4: Vortrag

Dienstag, 27. März 2001, 17:00–17:15, M

Oxidation of CoGa(100) Surface — •Feng-Ming Pan, Christian Pflitsch, Rudolf David, Laurens Verheij, and René Franchy — Institut für Grenzflächenforschung und Vakuumphysik, Forschungszentrum Jülich, D-52425 Jülich, Germany

The preparation of ordered β-Ga2O3 on the CoGa(100) surface by exposing the surface to oxygen has been studied by thermal energy helium atom scattering (TEAS), low energy electron diffraction (LEED) and Auger electron spectroscopy (AES). Upon oxidation at 300 K followed by subsequent annealing at 700 K, the β-Ga2O3 film is not continuous. Around 15% of the surface remains uncovered by the oxide after this preparation method. A continuous and well ordered β-Ga2O3 film with a uniform thickness is obtained after oxidation above 600 K. When the oxygen partial pressure is larger than 2×10−7 mbar, well ordered β-Ga2O3 is produced for oxidation at 900 K, which is higher than the desorption temperature (850 K) of oxygen from the CoGa(100) surface. Increasing the oxidation temperature from 600 K to 900 K results in an increase of the helium reflectivity, and the diffraction peak width decreases, indicating that the average size of the oxide domains increases and, consequently, that the step density decreases with the oxidation temperature.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2001 > Hamburg