Polarization Switching Behaviour of Metallo-Organic Decomposition Processed (Pb_0.60Ca_0.40)TiO₃ Thin Film Capacitors

Abstract

Polarization switching behaviours of polycrystalline (Pb_0.60Ca_0.40)TiO₃ thin films deposited on Pt/Ti/SiO₂/Si substrate by metallo-organic decomposition technique have been studied in detail. The switching time dependence of the polarization demonstrates the effect of charge injection on the ferroelectric properties of the film. Typically, the upper limit of the polarization switching time of these films free from charge injection is ∼20 ms. The (Pb_0.60Ca_0.40)TiO₃ film with simple Pt top and bottom electrodes exhibits ferroelectric properties with spontaneous polarization P_s∼19 μc/cm², remanent polarization P_r∼11.8 μc/cm² and coercive field E_c∼167 kV/cm and fatigue free behavior up to ∼5.3 × 10⁵ read/write cycles. Although the observed value of E_c and fatigue free behavior up to 10⁵ read/write cycles of these (Pb_0.60Ca_0.40)TiO₃ films are not promising for their use in memory devices, no systematic study of the polarization switching properties of (Pb_0.60Ca_0.40)TiO₃ films has been discussed earlier in the literature.

Keywords:

• Polarization switching properties
• fatigue endurance
• lead calcium titanate