Study of nanocrystalline TiN/Si3N4 thin films deposited using a dual ion beam method

J. S. Colligon, V. Vishnyakov, R. Valizadeh, S. E. Donnelly, S. Kumashiro

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

A dual ion beam system is used to produce hard nanocomposite TiN/Si 3N4 coatings on Si. Cross-sectional high resolution transmission electron microscopy analysis of the coatings shows that ion assistance causes microstructure to change from the non-assisted columnar form to one where there are small crystals present in an amorphous percolation network. For an unheated Si substrate, the microhardness increases with increasing ion-assist energy from 24 to 29 GPa, whereas for a deposition substrate at 400 °C, the microhardness values are 7-8 GPa or higher. The value of microhardness does not change even when coatings are annealed in vacuum at 1000 °C, showing that these coatings have high thermal stability. X-ray photoelectron spectroscopy data indicate that the -Ti-N-Si- bonds expected when the percolation network is formed are present only for substrate temperatures above 600 °C and that Ti-Si bonds form at lower temperature and during excess ion bombardment.

Original languageEnglish
Pages (from-to)148-154
Number of pages7
JournalThin Solid Films
Volume485
Issue number1-2
Early online date12 May 2005
DOIs
Publication statusPublished - 1 Aug 2005
Externally publishedYes

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