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Pulsed laser deposition of nanocrystalline SiC films

Authors
Journal
Applied Surface Science
0169-4332
Publisher
Elsevier
Volume
306
Identifiers
DOI: 10.1016/j.apsusc.2014.01.201
Keywords
  • Sic
  • Hard Coatings
  • Pulsed Laser Deposition

Abstract

Abstract Thin SiC films were grown on (100) Si substrates at temperatures from 400 to 1000°C under various CH4 pressures by the pulsed laser deposition (PLD) technique using a KrF excimer laser. After deposition, films were in situ annealed at their deposition temperature under 500mbar of CH4 for 1.0–1.5h. X-ray reflectivity investigations showed that films exhibited mass densities similar to SiC single crystal samples, while symmetrical and grazing incidence X-ray diffraction investigations found that films deposited at 800°C or higher substrate temperatures were nanocrystalline. Modeling of spectroscopic ellipsometry measurements indicated that the refractive index values were similar to those reported for bulk SiC, while X-ray photoelectron spectroscopy investigations found that films contained in bulk a relatively low oxygen concentration of around 1.0at.%. Nanoindentation results showed that the deposited SiC films were very hard, with hardness values above 40GPa for films deposited at temperatures higher than 800°C.

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