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Pateau, A., Rhallabi, A., Fernandez, M.-C., Boufnichel, M. & Roqueta, F. (2014) Modeling of inductively coupled plasma SF6/O-2/Ar plasma discharge: Effect of O-2 on the plasma kinetic properties. J. Vac. Sci. Technol. A, 32 021303.
Added by: Florent Boucher (2016-04-29 09:26:44) |
| Type de référence: Article DOI: 10.1116/1.4853675 Numéro d'identification (ISBN etc.): 0734-2101 Clé BibTeX: Pateau2014 Voir tous les détails bibliographiques  |
Catégories: PCM Mots-clés: bosch process, cross-section measurements, deep, electron-impact-ionization, etching process, global-model, low-pressure, oxygen discharge, rf discharge, silicon Créateurs: Boufnichel, Fernandez, Pateau, Rhallabi, Roqueta Collection: J. Vac. Sci. Technol. A |
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A global model has been developed for low-pressure, inductively coupled plasma (ICP) SF6/O-2/Ar mixtures. This model is based on a set of mass balance equations for all the considered species, coupled with the discharge power balance equation and the charge neutrality condition. The present study is an extension of the kinetic global model previously developed for SF6/Ar ICP plasma discharges [Lallement et al., Plasma Sources Sci. Technol. 18, 025001 (2009)]. It is focused on the study of the impact of the O-2 addition to the SF6/Ar gas mixture on the plasma kinetic properties. The simulation results show that the electron density increases with the %O-2, which is due to the decrease of the plasma electronegativity, while the electron temperature is almost constant in our pressure range. The density evolutions of atomic fluorine and oxygen versus %O-2 have been analyzed. Those atomic radicals play an important role in the silicon etching process. The atomic fluorine density increases from 0 up to 40% O-2 where it reaches a maximum. This is due to the enhancement of the SF6 dissociation processes and the production of fluorine through the reactions between SFx and O. This trend is experimentally confirmed. On the other hand, the simulation results show that O(3p) is the preponderant atomic oxygen. Its density increases with % O-2 until reaching a maximum at almost 40% O-2. Over this value, its diminution with O-2% can be justified by the high increase in the loss frequency of O(3p) by electronic impact in comparison to its production frequency by electronic impact with O-2. (C) 2014 American Vacuum Society.
Added by: Florent Boucher |