Structure, ferroelectric, and enhanced fatigue properties of sol–gel-processed new Bi-based perovskite thin films of Bi(Cu_1/2Ti_1/2)O₃–PbTiO₃

Abstract

Bi-based perovskite ferroelectric thin films have aroused wide attentions in electronic devices due to their excellent ferroelectric properties. New Bi-based perovskite thin films Bi(Cu1/2Ti1/2)O3-PbTiO3 (BCT-PT) were deposited onto Pt(111)/Ti/SiO2/Si substrates in the present study by the traditional sol-gel approach. Thereafter, structure and related ferroelectric as well as fatigue characteristics were carefully studied. The BCT-PT thin films exhibited good crystallization within the phase-pure perovskite structure, besides, they had a predominant (100) orientation together with a dense and homogeneous microstructure. The remnant polarization (2P r) values at 30 μC/cm2 and 16 μC/cm2 were observed in 0.1BCT-0.9PT and 0.2BCT-0.8PT thin films, respectively. More intriguingly, although the polarization values are not so high, 0.2BCT-0.8PT thin films show outstanding polarization fatigue properties, with a high switchable polarization of 93.6% of the starting values after 108 cycles, indicating promising applications in ferroelectric memories.