Stabilization of higher-κ tetragonal HfO2 by SiO2 admixture enabling thermally stable metal-insulator-metal capacitors
作者:T. S. Böscke、S. Govindarajan、P. D. Kirsch、P. Y. Hung、C. Krug、B. H. Lee、J. Heitmann、U. Schröder、G. Pant、B. E. Gnade、W. H. Krautschneider
DOI:10.1063/1.2771376
日期:2007.8.13
The authors report the relationship between HfO2 crystalline phase and the resulting electrical properties. Crystallization of amorphous HfO2 into the monoclinic phase led to a significant increase in leakage current and formation of local defects. Admixture of 10% SiO2 avoided formation of these defects by stabilization of the tetragonal phase, and concurrently increased the permittivity to 35. This
A method of synthesizing a substantially pure homoleptic tetrakis secondary amine derivative of silicon, said derivative being substantially free of halogen and having the formula:
Si(NRR
1
)
4
wherein: R and R
1
are the same or different and are substituted or unsubstituted straight or branched chain alkyl, groups having from 1 to 6 carbon atoms, said method comprising reacting a silicon halide having the formula:
SiX
4
wherein: X is bromine or iodine, with an excess of a secondary amine having the formula:
HNRR
1
wherein: R and R
1
are as defined as above,
for a time and under conditions sufficient to produce a reaction product mixture containing the desired product, Si(NRR
1
)
4
.
Effect of thickness on the crystallization of ultrathin HfSiON gate dielectrics
作者:G. Pant、A. Gnade、M. J. Kim、R. M. Wallace、B. E. Gnade、M. A. Quevedo-Lopez、P. D. Kirsch
DOI:10.1063/1.2165182
日期:2006.1.16
The crystallization of ultrathin hafnium silicon oxynitride (HfSiON) gatedielectric is studied as a function of physical thickness. Grazing incidence x-ray diffraction (GI-XRD) was used to detect phase separation and crystallization of 1.5, 2.0, 2.5, and 4.0 nm HfSiON films after 1000°C10s dopant activation anneal. Crystallization peaks corresponding to monoclinic and tetragonal HfO2 were detected