Growth of epitaxial oxides on silicon using atomic layer deposition: Crystallization and annealing of TiO2 on SrTiO3-buffered Si(001)

Martin D. McDaniel, Agham Posadas, Thong Q. Ngo, Ajit Dhamdhere, David Smith, Alexander A. Demkov, John G. Ekerdt

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Epitaxial anatase titanium dioxide (TiO2) films have been grown by atomic layer deposition (ALD) on Si(001) substrates using a strontium titanate (STO) buffer layer without any amorphous SiOx layer at the STO-Si interface. Four unit cells of STO grown by molecular beam epitaxy (MBE) serve as the surface template for ALD growth. To preserve the quality of the MBE-grown STO, the samples were transferred in situ from the MBE chamber to the ALD chamber. The growth of TiO2 was achieved using titanium isopropoxide and water as the coreactants at a substrate temperature of 250 °C. In situ x-ray photoelectron spectroscopy analysis revealed that the ALD process did not induce Si-O bonding at the STO-Si interface. Slight improvement in crystallinity of the TiO2 film was achieved through in situ annealing under vacuum (10-9 Torr) at 450-600 °C. However, the amount of Si-O bonding increased following annealing at temperatures greater than 250 °C. X-ray diffraction revealed that TiO2 films annealed at a temperature of 250 °C in vacuum (10-9 Torr) for 1 h were the anatase phase and well crystallized. The results indicate that careful consideration of growth temperature and annealing conditions may allow epitaxial oxide films to be grown by ALD on STO-buffered Si(001) substrates without formation of an amorphous SiOx layer.

Original languageEnglish (US)
Article number04E111
JournalJournal of Vacuum Science and Technology B:Nanotechnology and Microelectronics
Volume30
Issue number4
DOIs
StatePublished - 2012

Fingerprint

Atomic layer deposition
Silicon
Strontium
atomic layer epitaxy
Crystallization
strontium
Oxides
Annealing
crystallization
annealing
oxides
silicon
Molecular beam epitaxy
Titanium dioxide
molecular beam epitaxy
anatase
Substrates
chambers
Vacuum
vacuum

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Growth of epitaxial oxides on silicon using atomic layer deposition : Crystallization and annealing of TiO2 on SrTiO3-buffered Si(001). / McDaniel, Martin D.; Posadas, Agham; Ngo, Thong Q.; Dhamdhere, Ajit; Smith, David; Demkov, Alexander A.; Ekerdt, John G.

In: Journal of Vacuum Science and Technology B:Nanotechnology and Microelectronics, Vol. 30, No. 4, 04E111, 2012.

Research output: Contribution to journalArticle

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