Mechanistic study of surface contamination of dielectric oxides using isotope labeling

Prashant Raghu, Chris Yim, Asad Iqbal, Farhang Shadman, Eric Shero, Mohith Verghese

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Surface molecular contamination of gate dielectrics in metal oxide semiconductor structures is a problem affecting the performance of integrated circuits. The impact depends strongly on the nature of the interactions between the contaminants and the dielectric surfaces. The mechanism of interactions of moisture and isopropyl alcohol (IPA) with SiO2 and ZrO2 films was studied using isotope labeling with deuterium oxide (D2O). The results revealed that H2O adsorbs in a random multilayer configuration with three distinct types of interactions (hydroxylation of oxide in the first layer, MOH-H2O interactions in the second layer, and nondissociative H2O-H2O interactions in the higher layers). On the basis of these findings, a multilayer multicomponent adsorption/desorption model was developed that agrees well with the experimental data. The adsorption of IPA also follows multilayer dynamics. The interaction with the bare dielectric surface is nondissociative and relatively weak. However, IPA chemisorbs on a hydroxylated oxide. The isotope labeling studies revealed an exchange mechanism in which IPA undergoes an esterification reaction with chemisorbed H2O.

Original languageEnglish (US)
Pages (from-to)2977-2985
Number of pages9
JournalIndustrial and Engineering Chemistry Research
Volume43
Issue number12
StatePublished - Jun 9 2004

Fingerprint

2-Propanol
Isotopes
Oxides
Labeling
alcohol
Alcohols
Contamination
oxide
isotope
Multilayers
Deuterium Oxide
adsorption
Adsorption
Heavy water
Hydroxylation
Gate dielectrics
Esterification
deuterium
Integrated circuits
Desorption

ASJC Scopus subject areas

  • Polymers and Plastics
  • Environmental Science(all)
  • Chemical Engineering (miscellaneous)

Cite this

Mechanistic study of surface contamination of dielectric oxides using isotope labeling. / Raghu, Prashant; Yim, Chris; Iqbal, Asad; Shadman, Farhang; Shero, Eric; Verghese, Mohith.

In: Industrial and Engineering Chemistry Research, Vol. 43, No. 12, 09.06.2004, p. 2977-2985.

Research output: Contribution to journalArticle

Raghu, Prashant ; Yim, Chris ; Iqbal, Asad ; Shadman, Farhang ; Shero, Eric ; Verghese, Mohith. / Mechanistic study of surface contamination of dielectric oxides using isotope labeling. In: Industrial and Engineering Chemistry Research. 2004 ; Vol. 43, No. 12. pp. 2977-2985.
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