Dry ex situ cleaning processes for (0001)Si 6H-SiC surfaces

Sean W. King, Robert J. Nemanich, Robert F. Davis

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

A completely dry ex situ cleaning process based on UV/O3 oxidation and HF vapor exposure for removal of residual C and oxide, respectively, from (0001)Si [the silicon-terminated surface of SiC] 6H-SiC surfaces to levels equivalent to or better than conventional wet chemical ex situ processing has been demonstrated. X-ray photoelectron spectroscopy (XPS) of surfaces exposed to UV-generated ozone revealed the formation of carbon and silicon oxides, as indicated by the broad Si-O Si 2p peak at 102.4 eV (full width at half-maximum = 2.1 eV) and a shift in the surface C 1s peak from 283.6 to 284.2 eV, respectively. Evidence for a reduction in the amount of surface C was shown by an increase in the ratio of the SiC C peak to the surface C peak from 0.8 to 2.7 after the UV/O3 treatment. Removal of the UV/O3 silicon oxide via exposure to the vapor from a 10:1 buffered HF solution was indicated by the absence (below the XPS detection limit) of the Si-O Si 2p peak at 102.4 eV. However, this last process results in a F-terminated surface.

Original languageEnglish (US)
Pages (from-to)2648-2651
Number of pages4
JournalJournal of the Electrochemical Society
Volume146
Issue number7
DOIs
StatePublished - Jul 1999

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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