Low-density oxide grown thermally on sidewall of Si nanopillars

Shujun Ye, Kikuo Yamabe, Tetsuo Endoh

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Diffusion inhibition of the oxidant in the oxide, developed from thermal oxidation of the two-dimensional Si planar surface, has been considered to be the mechanism of self-limiting oxidation of Si nanopillars by many groups over a long period. However, in this work, we found that oxide grown thermally on the sidewall of Si nanopillars has lower density compared to that on a two-dimensional planar bottom surface oxidized under the same conditions. The oxidant diffuses faster in lower density SiO2, which means that the oxidant diffusion inhibition model is insufficient for explaining the self-limiting oxidation of Si nanopillars. A simple model is proposed to explain the formation mechanism of low-density oxide grown thermally on the sidewall of Si nanopillars. This work contributes in intrinsically understanding and precisely controlling the oxidation of Si nanopillars for future device fabrications.

Original languageEnglish
Article number126780
JournalMaterials Letters
Volume258
DOIs
Publication statusPublished - 2020 Jan 1

Keywords

  • Oxidation
  • Oxide density
  • Self-limiting oxidation
  • Si nanopillar
  • Si nanowire

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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