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Atomic layer deposition of HfO2, Al2O3, and HfAlOx using O3 and metal(diethylamino) precursors

Published online by Cambridge University Press:  31 January 2011

Rajesh Katamreddy ,
Ronald Inman ,
Gregory Jursich ,
Axel Soulet  and
Christos Takoudis
Rajesh Katamreddy
Affiliation:
American Air Liquide, Chicago Research Center, Countryside, Illinois 60525; and Department of Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60607
Ronald Inman
Affiliation:
American Air Liquide, Chicago Research Center, Countryside, Illinois 60525
Gregory Jursich
Affiliation:
American Air Liquide, Chicago Research Center, Countryside, Illinois 60525
Axel Soulet
Affiliation:
American Air Liquide, Chicago Research Center, Countryside, Illinois 60525
Christos Takoudis*
Affiliation:
Departments of Chemical Engineering and Bioengineering, University of Illinois at Chicago, Chicago, Illinois 60607
*
a)Address all correspondence to this author. e-mail: takoudis@uic.edu
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Abstract

Tetrakis-diethylamino hafnium (TDEAH), tris-diethylamino aluminum (TDEAA), and ozone were used for the atomic layer deposition (ALD) of HfO2, Al2O3, and HfAlOx films. The ALD rates were measured to be 1.1 Å/cycle for HfO2 and 1.3 Å/cycle for Al2O3. The ALD temperature windows were found to be between 200 and 325 °C for TDEAA, and between 200 and 275 °C for TDEAH. The overlap of these ALD windows between 200 and 275 °C is critical for ALD of the composite film, HfAlOx. In addition to the overlapping ALD temperature windows, the two metal precursors have similar thermal characteristics, as shown by TGA and differential scanning calorimetry. As-deposited films and films postannealed at 600 and 800 °C films were analyzed using Fourier transformed infrared (FTIR) spectroscopy, x-ray photoelectron spectroscopy, and x-ray diffraction (XRD) techniques. FTIR spectra revealed interfacial oxide growth during deposition of both HfO2 and Al2O3 whose thickness increased with annealing temperature. The FTIR data also indicated hydroxyl and nitrate groups in the films; these species were removed after annealing in Ar at a temperature of ⩾600 °C. Both FTIR and XRD results indicated the crystallization of pure HfO2 after annealing at temperatures as low as 600 °C. On the other hand, pure Al2O3 remained amorphous after annealing at temperatures up to 800 °C. XRD data of the composite HfAlOx film show that films deposited by alternating five cycles of HfO2 and one cycle of Al2O3 remained amorphous after annealing at 600 °C. Rutherford backscattering analysis of HfAlOx deposited with a varied number of alternating HfO2 and Al2O3 cycles demonstrated a strong correlation between the cyclic dosage of TDEAA and TDEAH and the film composition.

Keywords

AnnealingAtomic layer depositionDielectric

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Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 12 , December 2007 , pp. 3455 - 3464
Copyright
Copyright © Materials Research Society 2007

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