Formation of SiC nanoparticles of two-layer C/Si films on the Si substrate using thermal annealing

C. K. Chung, C. W. Lai, C. C. Peng, B. H. Wu

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Ion beam sputtering system under ultra high vacuum was used to deposit two-layer C/a-Si thin films on the Si(100) substrates at room temperature (RT). Carbon (C) layer thickness was fixed at 100 nm and amorphous silicon (a-Si) was varied at 5 nm and 50 nm. Rapid thermal annealing was performed to investigate the formation of SiC nanoparticles (np-SiCs) at 750-900 °C for 0.5 min. Field emission scanning electron microscope (FESEM), Raman spectroscopy and X-ray diffraction were used for the characterization of nanoparticle formation, evolution of bonding between Si and C reaction and phase formation, respectively. No particle appears on the surface of two-layer C/a-Si films deposited at RT and post annealed at 750 °C. Many np-SiCs were formed at 900 °C on the surface of films with thin underlying a-Si of 5 nm but not in the two-layer film with thick a-Si of 50 nm. The sample with thinner a-Si film on bulk Si(100) has lower activation energy for the diffusion of Si atoms in the film and bulk to react with C to form np-SiC at 900 °C compared to the sample with thicker a-Si film. A mechanism of np-SiCs formation on the surface of two-layer C/a-Si films using thermal annealing was proposed and discussed.

Original languageEnglish
Pages (from-to)1219-1224
Number of pages6
JournalThin Solid Films
Volume517
Issue number3
DOIs
Publication statusPublished - 2008 Dec 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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