Modelling of low energy ion sputtering from oxide surfaces
Résumé
The main aim with this work is to present a way to estimate values of the surface binding energy for oxides. This is done by fitting results from the binary collisions approximation code Tridyn, with data from the reactive sputtering processing curves, as well as the elemental composition obtained from X-ray photoelectron spectroscopy (XPS). Oxide targets of Al, Ti, V, Nb, and Ta are studied The obtained surface binding energies are then used to predict the partial sputtering yields. Anomalously high sputtering yield is observed for TiO 2 target. This is attributed to the high sputtering yield of Ti lower oxides. Such an effect is not observed for the other studied metals. XPS measurement of the oxide targets confirms the formation of suboxides during ion bombardment as well as an oxygen deficient surface in steady state. These effects are confirmed from the processing curves from the oxide targets showing an elevated sputtering rate in pure argon.
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