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Thermal stability of copper nitride thin films: The role of nitrogen migration

AuthorsGonzález-Arrabal, Raquel ; Gordillo, Nuria; Martín-González, Marisol; Ruiz-Bustos, R.; Agulló-López, F.
Atomic force microscopy
Copper compounds
Crystal structure
Ion beam effects
Optical properties
Solid solutions
Thermal stability
X-ray diffraction
Issue Date20-May-2010
PublisherAmerican Institute of Physics
CitationJournal of Applied Physics 107, 103513 (2010)
AbstractThe atomic composition, structural, morphological, and optical properties of N-rich copper nitride thin films have been investigated prior to and after annealing them in vacuum at temperatures up to 300 °C. Films were characterized by means of ion-beam analysis (IBMA), X-ray diffraction (XRD), atomic force microscopy (AFM), and spectroscopic ellipsometry techniques (SE). The data reveal that even when the total (integrated over the whole thickness) atomic composition of the films remains constant, nitrogen starts to migrate from the bulk to the film surface, without out-diffusing, at temperatures as low as 100 °C. This migration leads to two chemical phases with different atomic concentration of nitrogen, lattice parameters, and crystallographic orientation but with the same crystal structure. XRD experimental and Rietveld refined data seem to confirm that nitrogen excess accommodates in interstitial locations within the anti-ReO3 crystal lattice forming a solid solution. The influence of nitrogen migration on the optical (electronic) properties of the films will be discussed.
Publisher version (URL)http://dx.doi.org/10.1063/1.3369450
Appears in Collections:(IMN-CNM) Artículos
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