Ellipsometry study on refractive index profiles of the SiO 2/Si3N4/SiO2/Si structure

Tien-Sheng Chao*, Chung Len Lee, Tan Fu Lei

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

In this work, the refractive index profiles of SiO2/Si 3N4/SiO2/silicon (ONO) structures were measured and analyzed by ellipsometry. The ONO structures were obtained by oxidizing the Si3N4/SiO2/silicon structure in a wet O 2 ambient at the temperature range of 900-1050°C for different lengths of time. It was found that for a nitride film thickness less than 250 Å, oxygen not only oxidized the surface, but diffused through the nitride and oxidized the inner surface of the nitride. This result was confirmed by the Auger analysis. The kinetics of the wet O2 oxidation of nitride at the above temperature range was linear for an oxidation time of 30-120 min. The activation energy was 2.24 eV.

Original languageEnglish
Pages (from-to)1732-1736
Number of pages5
JournalJournal of Applied Physics
Volume73
Issue number4
DOIs
StatePublished - 1 Dec 1993

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