STEM study of interfacial reaction at HfxAl1-xOy/Si interfaces

Jiyan Dai, K. Li, P. F. Lee, X. Zhao, S. Redkar

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)


Hfx(Al1-xOythin films were deposited by pulsed-laser deposition (PLD) on p-type (001) Si substrates. Interfacial reaction at HfxAl1-xOy/Si interfaces was studied by scanning transmission electron microscopy (STEM) using high-angle annular dark field imaging technique and the energy dispersive X-ray (EDX) line scan analysis. The results showed that the interfacial reaction is due to Hf diffusion into the Si substrate forming Hf suicide. The presence of Al in the HfxAl1-xOyfilms was found to be responsible for the Hf suicide formation and it showed that increasing of Al content in the films reduced the interfacial reaction. Therefore, high-quality HfxAl1-xOyfilms possessing a reaction-free interface with Si may be obtained by optimizing the growth condition.
Original languageEnglish
Pages (from-to)114-117
Number of pages4
JournalThin Solid Films
Issue numberSPEC. ISS.
Publication statusPublished - 1 Sept 2004


  • Hf Al O x 1-x y
  • High-k gate dielectric
  • Interfacial structure
  • STEM

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry


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