Time evolution of interface roughness during thermal oxidation on Si(0 0 1)

Yuji Takakuwa, Fumiaki Ishida, Takuo Kawawa

Research output: Contribution to journalConference article

19 Citations (Scopus)

Abstract

The surface morphological change at an initial stage of thermal oxidation on Si(0 0 1) surface with O 2 was investigated as a function of oxide coverage by a real-time monitoring method of Auger electron spectroscopy (AES) combined with reflection high energy electron diffraction (RHEED). At 653 °C where oxide islands grow laterally, protrusions were observed to develop under the oxide islands as a consequence of concurrent etching of the surface. The rate of etching was measured from a periodic oscillation of RHEED half-order spot intensity I (1/2,0) and I (0,1/2) . At 549 °C where Langmuir-type adsorption proceeds, it was observed that both I (1/2,0) and I (0,1/2) decrease more rapidly in comparison with an increase of oxide coverage and the intensity ratio between them decreases gradually with O 2 exposure time. These suggest that Langmuir-type adsorption occurs at sites where O 2 adsorbs randomly, leading to subdivision of the 2 × 1 and 1 × 2 domains by oxidized regions, and that Si atoms are ejected due to volume expansion in oxidation to change the ratio between 2 × 1 and 1 × 2 domains.

Original languageEnglish
Pages (from-to)20-25
Number of pages6
JournalApplied Surface Science
Volume190
Issue number1-4
DOIs
Publication statusPublished - 2002 May 8
EventProceedings of the 8th International COnference on the form (ICFSI-8) - , Japan
Duration: 2001 Jun 102001 Jun 10

Keywords

  • AES
  • Oxide coverage
  • RHEED
  • Real-time monitoring
  • Si thermal oxidation
  • Surface morphology

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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