Orientation and electrode configuration dependence on ferroelectric, dielectric properties of BaTiO3 thin films

Abstract

BaTiO3 (BTO) thin films with an SrRuO3 buffer layer have been deposited on a range of lattice mismatched substrates, including single crystalline (111)-oriented LaAlO3 and (100)-, (110)-, and (111)- oriented SrTiO3 substrates by pulse laser deposition. The results show that the crystal structure of BTO film is affected by the type and orientation of the substrates. The BTO films exhibits strong ferroelectric and dielectric anisotropy. Different electrode configurations affect the voltage required for polarization, but do not affect the final polarization state. The (111)-oriented film exhibits a large polarization Ps=92.43μC/cm2, Pr=51.74μC/cm2, the (100) orientation has a smaller coercive field EC=19.52 kV/cm and a leakage current, and the (110) orientation has a larger dielectric constant.