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Mechanism for Breakage of Si-O Networks of SiO2 Films in HF Solutions

Published online by Cambridge University Press:  10 February 2011

Tomoki Oku ,
Ryo Hattori  and
Kazuhiko Sato
Tomoki Oku
Affiliation:
Mitsubishi Electric Corporation, Optoelectronic and Microwave Devices Laboratory, 4–1 Mizuhara, Itami City, Hyogo 664, Japan, oku@oml.melco.co.jp
Ryo Hattori
Affiliation:
Mitsubishi Electric Corporation, Optoelectronic and Microwave Devices Laboratory, 4–1 Mizuhara, Itami City, Hyogo 664, Japan, oku@oml.melco.co.jp
Kazuhiko Sato
Affiliation:
Mitsubishi Electric Corporation, Optoelectronic and Microwave Devices Laboratory, 4–1 Mizuhara, Itami City, Hyogo 664, Japan, oku@oml.melco.co.jp
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Abstract

An extended Hiickel calculation was employed to calculate the total electronic energy and the electron density during the breakage of the Si-O networks of a (F3SiO)2FSiOSiF(OSiF3)2 cluster modelled on the a-cristobalite structure. The Si-O networks are opened by the attack of F- ions on the silicon atoms, and the reaction is exthothermic by 2.7 eV through the attack of H+ ions on the oxygen atoms. Although the hydrogen termination of the oxygen atoms is an early reaction, the fluorine termination of the silicon atoms is a late reaction. The atomic bond population on the Si-O bonds decreases to zero by opening the Si-O networks. We conclude that the a-cristobalite and a-quartz SiO2 are dissolved in HF solutions since the Si-O networks are easily opened by the attack of F- ions. Our conclusion indicates that both cosite and stishovite SiO2, which are not dissolved in the HF solutions, are composed of Si-O networks that can be hardly opened by the attack of F- ions. Moreover, we propose the continual breakage of Si-O networks without the desorption of H2O molecules as an etching mechanism of SiO2 films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 492: Symposium S – Microscopic Simulation of Interfacial Phenomena in Solids… , 1997 , 213
Copyright
Copyright © Materials Research Society 1998

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References

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