Investigation of evolution hydrocarbon species on a Si surface during methane plasma with and without substrate bias, using infrared spectroscopy in multiple internal reflection geometry

Masanori Shinohara, Hiromichi Shibata, Ken Cho, Tatsuyuki Nakatani, Keishi Okamoto, Yoshinobu Matsuda, Hiroshi Fujiyama

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

We investigated evolution of hydrocarbon species on a Si surface during methane plasma both with and without substrate bias, using infrared spectroscopy in multiple internal reflection geometry (MIR-IRAS). We found that the relative density of the sp 3 -CH or sp 3 -CH 2 species to the sp 3 -CH 3 species was low in the low exposure regions, but that the relative density of the sp 3 -CH or sp 3 -CH 2 species increased as the exposure was higher. Substrate temperatures rose as the plasma exposure was higher. The changes of ratios would be ascribed to the substrate heating effect by plasma exposure, which would enhance the etching and/or hydrogen abstraction effects. We also found the change of CH 1-2 /CH 3 ratios was enhanced when the high substrate bias was applied. The enhancement of the ratio was due to ion effects.

Original languageEnglish
Pages (from-to)6242-6247
Number of pages6
JournalApplied Surface Science
Volume253
Issue number14
DOIs
Publication statusPublished - 2007 May 15

Keywords

  • Hydrocarbon
  • Hydrogen
  • Infrared spectroscopy
  • Plasma processing

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Investigation of evolution hydrocarbon species on a Si surface during methane plasma with and without substrate bias, using infrared spectroscopy in multiple internal reflection geometry'. Together they form a unique fingerprint.

Cite this