  A laser multicharged ion source was used to perform interfacial treatment of
the 4H-SiC/ SiO2 interface using B and Ba ions. A Q-switched Nd:YAG laser
(wavelength {\lambda} = 1064 nm, pulse width {\tau} = 7 ns, and fluence F = 135
J/cm2) was used to ablate B and Ba targets to generate multicharged ions. The
ions were deflected by an electrostatic field to separate them from the
neutrals. The multicharged ions were used for nanometer layer growth and
shallow ion implantation in 4H-SiC. Several metal-oxide-semiconductor
capacitors (MOSCAP) were fabricated with a combination of B and Ba at the
SiC/SiO2 interface. High-low C-V measurements were used to characterize the
MOSCAPs. The B interfacial layer reduced the MOSCAP flatband voltage from 4.5
to 0.04 V, while the Ba layer had a negligible effect.
