Electrical and optical properties of PbTiO3 thin films on p-Si grown by metalorganic chemical vapor deposition at low temperature

Metalorganic chemical vapor deposition of PbTiO3 using Pb (tmhd)2, Ti(OC3H7)4, and N2O via thermal pyrolysis at relatively low temperature (∼500 °C) was performed in order to produce PbTiO3 insulator gates with high quality PbTiO3/p-Si interfaces. Raman spectroscopy showed the several optical phonon modes of the PbTiO3/p-Si structure. The stoichiometry of the PbTiO3 films was observed by Auger electron spectroscopy. Room-temperature current-voltage and capacitance-voltage measurements clearly revealed metal-insulator-semiconductor behavior for the samples with a PbTiO3 insulator gate, and the interface state densities at the PbTiO3/p-Si were approximately 1011 eV−1 cm−2 at the middle of the Si energy gap.