Roles of strain and carrier in silicon oxidation

Shuichi Ogawa, Akitaka Yoshigoe, Jaiyi Tang, Yuki Sekihata, Yuji Takakuwa

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper we review the study of the unified Si oxidation reaction model mediated by point defect generation, in which O2 dissociative adsorption occurs at dangling bonds of point defects (emitted Si atoms and vacancies) at the SiO2/Si interface, and the point defect generation rate is given by a combination of oxidation-induced strain, thermal strain due to the difference in thermal expansion coefficient between Si and SiO2, thermal excitation of Si emission rate, and heat of adsorption. The band bending of the SiO2/Si interface is caused by the electron and hole trapping at the vacancy for n-and p-Si substrates, respectively, leading to the charged states with unpaired electrons that is responsible for the dissociative adsorption of O2 molecule. Since P b0 and P b1 centers with unpaired electron are not concerned with the charge transfer of band bending, they are also the active sites for O2 dissociative adsorption.

Original languageEnglish
Article numberSM0801
JournalJapanese journal of applied physics
Volume59
Issue numberSM
DOIs
Publication statusPublished - 2020 Jul 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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