TITLE

Nano-oxidation of silicon surfaces: Comparison of noncontact and contact atomic-force microscopy methods

AUTHOR(S)
Tello, Marta; Garcı´a, Ricardo
PUB. DATE
July 2001
SOURCE
Applied Physics Letters;7/16/2001, Vol. 79 Issue 3
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Local oxidation lithography by atomic-force microscopy is emerging as a powerful method for nanometer-scale patterning of surfaces. Here, we perform a comparative study of contact and noncontact atomic-force microscopy (AFM) oxidation experiments. The comparison of height and width dependencies on voltage and pulse duration allows establishing noncontact AFM as the optimum local oxidation method. For the same electrical conditions, noncontact AFM oxides exhibit higher aspect ratios (0.04 vs 0.02). The smallness of the liquid meniscus in noncontact AFM oxidation produces smaller oxide widths. We also report a slower oxidation rate in contact AFM oxidation. We explain this result by introducing an effective energy barrier (∼0.14 eV) that includes the mechanical work done by the growing oxide against the cantilever (∼0.01 eV). © 2001 American Institute of Physics.
ACCESSION #
4812748

 

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