Characterization of interfacial reaction and chemical bonding features of LaOx/HfO2 stack structure formed on thermally-grown SiO2/Si(100)
A stack structure consisting of ?1.5nm-thick LaOx and ?4.0nm-thick HfO2 was formed on thermally grown SiO2 on Si(100) by MOCVD using dipivaloymethanato precursors, and the influence of N2 annealing on interfacial reaction for this stack structure was examined by using X-ray photoelectron spectroscopy and Fourier transform infrared attenuated total reflection. We found that compositional mixing between LaOx and HfO2 becomes significant from 600C upwards and that interfacial reaction between HfLayOz and SiO2 proceeds consistently at 1000C in N2 ambience.
interfacial reaction laox hfo2 x-ray photoelectron spectroscopy high-k dielectric