Removal of fluorine from a Si (100) surface by a remote RF hydrogen plasma

J. P. Barnak, S. King, J. Montgomery, Ja Hum Ku, Robert Nemanich

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Fluorine contamination was removed from a Si(100) surface by an atomic H flux. The surface was intentionally contaminated to approximate the residual fluorine concentration remaining after a concentrated HF last process. By dipping the wafers in concentrated HF the thin oxide was removed and replaced with a hydrogen and fluorine terminated surface. This surface was then either vacuum annealed or exposed to a 20 Watt rf excited H-plasma at 50 mTorr, in order to achieve an atomically clean surface. The substrate temperature during the H-plasma exposure and vacuum anneal was 450°C. The surface chemistry was characterized with x-ray photoemission spectroscopy (XPS), auger electron spectroscopy (AES), and angle-resolved UV photoemission spectroscopy (ARUPS). The surface symmetry was characterized with low energy electron diffraction (LEED). Before the H-plasma exposure, the XPS spectra indicated Si-F bonding, and a 1×1 LEED diffraction pattern was observed. Immediately following the H-plasma exposure, the fluorine concentration was reduced below detection limits of XPS, and the surface showed a 2×1 reconstruction. A mechanism is proposed by which molecular HF results from atomic hydrogen interactions with fluorine on the surface.

Original languageEnglish (US)
Title of host publicationMaterials Research Society Symposium - Proceedings
PublisherMaterials Research Society
Pages357-362
Number of pages6
Volume386
StatePublished - 1995
Externally publishedYes
EventProceedings of the 1995 MRS Spring Meeting - San Francisco, CA, USA
Duration: Apr 17 1995Apr 21 1995

Other

OtherProceedings of the 1995 MRS Spring Meeting
CitySan Francisco, CA, USA
Period4/17/954/21/95

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Barnak, J. P., King, S., Montgomery, J., Ku, J. H., & Nemanich, R. (1995). Removal of fluorine from a Si (100) surface by a remote RF hydrogen plasma. In Materials Research Society Symposium - Proceedings (Vol. 386, pp. 357-362). Materials Research Society.