We have analyzed MgTiO3 thin films grown on the Si substrate with/without S
iO2 using pulsed laser deposition (PLD). We find that MgTiO3 thin films sta
rt to crystallize at 600 degreesC, causing electrical instabilities in the
MIS capacitors above this temperature. Detailed analysis by XRD technique r
eveals that structural differences of MgTiO3 thin films were not obvious be
low 600 degreesC, whereas the electrical characteristics changes as a funct
ion of deposition temperature and the presence of thermally grown SiO2. We
observe that the decrease of deposition temperature results in the increase
of leakage current and anomalous positive charge (APC) density. These draw
backs were effectively suppressed by growing 100 Angstrom SiO2 layer on the
Si substrate prior to the deposition of MgTiO3 thin films.