Cobalt titanium nitride amorphous metal alloys by atomic layer deposition

Taewook Nam, Chang Wan Lee, Taehoon Cheon, Woo Jae Lee, Soo Hyun Kim, Se Hun Kwon, Han Bo Ram Lee, Hyungjun Kim

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4 Citations (Scopus)

Abstract

The formation of thin amorphous cobalt titanium nitride (CoTiN) layers was investigated using a supercycle method of atomic layer deposition (ALD). The stoichiometry of the resultant ALD CoTiN films was controlled by changing the ratio of Co and TiN thicknesses. X-ray diffraction analysis and transmission electron microscopy observations showed that the microstructure of the ALD Co and TiN was transformed from polycrystalline to amorphous CoTiN. The stoichiometry of the CoTiN layer was affected by the growth characteristics of ALD Co and TiN on each surface. The results revealed that ALD TiN undergoes nucleation incubation on the ALD Co surface, whereas ALD Co does not undergo nucleation incubation on the ALD TiN surface. The properties of the amorphous CoTiN layers were evaluated by diffusion experiments and mechanical tests. Because of the lack of grain boundaries, the CoTiN efficiently blocks the diffusion of Cu at elevated temperatures and exhibits higher hardness compared with ALD Co.

Original languageEnglish
Pages (from-to)684-692
Number of pages9
JournalJournal of Alloys and Compounds
Volume737
DOIs
Publication statusPublished - 2018 Mar 15

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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  • Cite this

    Nam, T., Lee, C. W., Cheon, T., Lee, W. J., Kim, S. H., Kwon, S. H., Lee, H. B. R., & Kim, H. (2018). Cobalt titanium nitride amorphous metal alloys by atomic layer deposition. Journal of Alloys and Compounds, 737, 684-692. https://doi.org/10.1016/j.jallcom.2017.12.023