TITLE

Thermal stability of hafnium–silicate and plasma-nitrided hafnium silicate films studied by Fourier transform infrared spectroscopy

AUTHOR(S)
Quevedo-Lopez, M. A.; Chambers, J. J.; Visokay, M. R.; Shanware, A.; Colombo, L.
PUB. DATE
July 2005
SOURCE
Applied Physics Letters;7/4/2005, Vol. 87 Issue 1, p012902
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Structure and bonding changes in ultrathin hafnium–silicate (HfSiO) and plasma-nitrided HfSiO (HfSiON) films as a result of thermal annealing are presented. To track these changes, attenuated total reflection Fourier transform infrared spectroscopy (FTIR) and high-resolution transmission electron microscopy were used. It is shown that for films with a given Si content, HfSiON films have superior thermal stability compared to the corresponding HfSiO films. It is also demonstrated that besides giving chemical state changes for the thin-film constituents, FTIR can also be used to track interfacial SiO2 growth as well as phase separation in ultrathin high-κ films resulting from thermal annealing.
ACCESSION #
18008428

 

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