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TitleDevelopment of tantalum oxynitride thin films produced by PVD: study of structural stability
Author(s)Cristea, D.
Crisan, A.
Barradas, N. P.
Alves, E.
Moura, C.
Vaz, F.
Cunha, L.
KeywordsTantalum oxynitride
Structural stability
Issue date25-Jun-2013
JournalApplied Surface Science
CitationApplied Surface Science 285P (2013) 19– 26
Abstract(s)The purpose of this work is to study the evolution of the structure and of the thermal stability of a group of tantalum oxynitride thin films, prepared by magnetron sputtering, under the influence of vacuum annealing, up to a temperature of 800 ºC. When varying the partial pressure of the reactive gases (PO2+N2), during the deposition process, the films change from a structure with a combination of poorly developed crystallites of the tetragonal beta-Ta and of the face centred cubic (fcc) Ta(O,N) phases, for the films deposited with low PO2+N2, to a quasi-amorphous structure, for the films deposited with highest pressures. For intermediate pressures, the films reveal the presence of the fcc-Ta(O,N) structure. This structure corresponds to O atoms substituting some of the N atoms on the fcc-TaN structure and/or N atoms substituting O atoms of the fcc-γ-TaO structure. When subjected to the thermal annealing at 700 ºC or higher, the film produced with lowest partial pressure revealed a remarkable structural change. New diffraction peaks appear and can only be attributed to a sub-stoichiometric hexagonal tantalum nitride structure. The film did not reveal any signs of delamination or cracks after all annealing temperatures. The two films produced with highest partial pressure proved to be the most stable. Structurally, they maintain the amorphous structure after all the annealing treatments and, in addition, no cracks or delamination were detected.
DescriptionSectoral Operation Programme Human Resources Development (SOP HRD), ID76945 financed from the European Social Fund and by the Romanian Government.
Publisher version
AccessRestricted access (UMinho)
Appears in Collections:CDF - GRF - Artigos/Papers (with refereeing)

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