Plasma-grown oxides on silicon with midgap interface state densities l
ess than 10(10) cm(-2) eV(-1) have been obtained using low process tem
peratures )<120 degrees C). Slow and fast interface state densities we
re measured over a wide frequency range by two different techniques: t
he quasi-static (CV) and the conductance (G(p)/w) methods. Careful att
ention to system apparatus design, cleanliness and operation are thoug
ht to be the main factors responsible for the low interface trap densi
ties.