Enhanced oxygen exchange near the oxide/silicon interface during silicon thermal oxidation

Masashi Uematsu, Marika Gunji, Masaru Tsuchiya, Kohei M Itoh

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The effect of the SiO2/Si interface on oxygen exchange diffusion during oxidation was investigated using oxygen isotopes. A 40-nm thick Si18O2 layer was first grown in 18O2 and then the sample was reoxidized in 16O2 at 1100 °C. The 18O diffusion in Si16O2 during the 16O2 oxidation was investigated by secondary ion mass spectrometry measurements. A significant broadening of the 18O profile toward the newly grown Si16O2 was observed. The average oxygen diffusivity was initially about one order of magnitude larger than the reported thermal diffusivity in the SiO2 network. In addition, the 18O diffusion became slower with oxidation time and hence with increasing distance between 18O diffusion region and the interface. This distance-dependent 18O self-diffusion was simulated taking into account the effect of Si16O molecules generated at the interface upon oxidation and diffusing into SiO2 to enhance the oxygen exchange. The simulation fits the SIMS profiles and shows that the SiO diffusion is greatly retarded by the oxidation with O2 from the oxygen-containing atmosphere. Therefore, the Si16O concentration becomes smaller as the interface leaves the 18O region and the oxygen exchange becomes slower with time.

Original languageEnglish
Pages (from-to)6596-6600
Number of pages5
JournalThin Solid Films
Volume515
Issue number16 SPEC. ISS.
DOIs
Publication statusPublished - 2007 Jun 4

Fingerprint

Silicon oxides
Silicon
silicon oxides
Oxygen
Oxidation
oxidation
silicon
oxygen
secondary ion mass spectrometry
Secondary ion mass spectrometry
Oxygen Isotopes
oxygen isotopes
thermal diffusivity
profiles
leaves
diffusivity
Thermal diffusivity
Hot Temperature
atmospheres
Isotopes

Keywords

  • Interface
  • Self-diffusion
  • Silicon oxide
  • Thermal oxidation

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Enhanced oxygen exchange near the oxide/silicon interface during silicon thermal oxidation. / Uematsu, Masashi; Gunji, Marika; Tsuchiya, Masaru; Itoh, Kohei M.

In: Thin Solid Films, Vol. 515, No. 16 SPEC. ISS., 04.06.2007, p. 6596-6600.

Research output: Contribution to journalArticle

Uematsu, Masashi ; Gunji, Marika ; Tsuchiya, Masaru ; Itoh, Kohei M. / Enhanced oxygen exchange near the oxide/silicon interface during silicon thermal oxidation. In: Thin Solid Films. 2007 ; Vol. 515, No. 16 SPEC. ISS. pp. 6596-6600.
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