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Title: Low temperature silicon dioxide by thermal atomic layer deposition: Investigation of material properties
Authors: Hiller, D ×
Zierold, R
Bachmann, J
Alexe, M
Yang, Y
Gerlach, J. W
Stesmans, Andre
Jivanescu, Mihaela
Mueller, U
Vogt, J
Hilmer, H
Loeper, P
Kuenle, M
Munnik, F
Nielsch, K
Zacharias, M #
Issue Date: Mar-2010
Publisher: American Institute of Physics
Series Title: Journal of Applied Physics vol:107 issue:6 pages:1-10
Article number: 064314
Abstract: SiO2 is the most widely used dielectric material but its growth or deposition involves high thermal budgets or suffers from shadowing effects. The low-temperature method presented here (150 degrees C) for the preparation of SiO2 by thermal atomic layer deposition (ALD) provides perfect uniformity and surface coverage even into nanoscale pores, which may well suit recent demands in nanoelectronics and nanotechnology. The ALD reaction based on 3-aminopropyltriethoxysilane, water, and ozone provides outstanding SiO2 quality and is free of catalysts or corrosive by-products. A variety of optical, structural, and electrical properties are investigated by means of infrared spectroscopy, UV-Vis spectroscopy, secondary ion mass spectrometry, capacitance-voltage and current-voltage measurements, electron spin resonance, Rutherford backscattering, elastic recoil detection analysis, atomic force microscopy, and variable angle spectroscopic ellipsometry. Many features, such as the optical constants (n, k) and optical transmission and surface roughness (1.5 A degrees), are found to be similar to thermal oxide quality. Rapid thermal annealing (RTA) at 1000 degrees C is demonstrated to significantly improve certain properties, in particular by reducing the etch rate in hydrofluoric acid, oxide charges, and interface defects. Besides a small amount of OH groups and a few atomic per mille of nitrogen in the oxide remaining from the growth and curable by RTA no impurities could be traced. Altogether, the data point to a first reliable low temperature ALD-growth process for silicon dioxide.
ISSN: 0021-8979
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Semiconductor Physics Section
× corresponding author
# (joint) last author

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