The improvement in ferroelectric performance of (Bi3.15Nd0.85)4Ti3O12 films by the addition of hydrogen peroxide in a spin-coating solution

Chemically synthesized (Bi3.15Nd0.85)Ti3O12 (BNT) films annealed at 650 °C for 15 min were prepared by different approaches to improve their fatigue problem. These approaches involved the selection of substrates with different overlayers, the addition of hydrogen peroxide (H2O2) to a spin-coating solution, and annealing in different atmospheres. BNT films on Ti-overlayered substrates had performed badly if processed at oxidation environments. BNT films on TiO2-overlayered substrates displayed stable and unchanged fatigue endurance if the spin-coating solution was modified by drops of the H2O2 solution to lesson the formation of oxygen vacancies in crystalline films. They were also fatigue-free in ferroelectricity after 1010 switching cycles and had remanent polarization of 24 μm/cm2, coercive field of 52 kV/cm, nonvolatile charge density of 13 μC/cm2 during relaxed fatigue tests, and leakage current of 10− 6 A at 3 V.