Unipolar and bipolar fatigue in antiferroelectric lead zirconate thin films and evidences for switching-induced charge injection inducing fatigue

摘要

We show that unipolar fatigue does occur in antiferroelectric capacitors, confirming the predictionsnof a previous work u0003Appl. Phys. Lett. 94, 072901 u00012009u0002u0004. We also show that unipolar fatigue innantiferroelectrics is less severe than bipolar fatigue if the driving field is of the same magnitude. Thisnphenomenon has been attributed to the switching-induced charge injection, the main cause fornpolarization fatigue in ferroelectric and antiferroelectric materials. Other evidences for polarizationnfatigue caused by the switching-induced charge injection from the nearby electrode rather than thencharge injection during the stable/quasistable leakage current stage are also discussed.