Electrically Controlled Reversible Polarization Fatigue–Recovery in Ferroelectric Thin Film Capacitors Electrically Controlled Reversible Polarization Fatigue–Recovery in Ferroelectric Thin Film Capacitors AITranslate

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DOI：https://doi.org/10.1021/acsaelm.1c01347

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Spontaneous polarization switchable by the externally applied electric field in ferroelectrics is a crucial feature for its technological applications; however, the reduction in switchable polarization due to bipolar electric cycling primarily hampers its potential application in nonvolatile memory. Among others, electric-field-controlled polarization recovery would be highly desirable from fundamental and technological viewpoints. In spite of recent progress in electrically controlled polarization recovery, polarization reversal behavior in fatigued and recovered states, associated device resistance change, and repeatability and reproducibility of fatigue–recovery cycles remain poorly understood. This study provides an in-depth insight into the recovery of fatigued polarization by an electric field for epitaxially grown Pb(Zr0.3Ti0.7)O3 thin film capacitor with oxide electrodes. Systematic analysis of time- and field-dependent polarization switching kinetics in pristine, fatigued, and recovered states using a suitable statistical model enabled the precise extraction of microscopic switching parameters such as mean characteristic switching times and effective activation fields. Our results demonstrate that fatigue and recovery are possibly mediated by domain pinning–depinning because of defect redistribution and trapping–detrapping of charges at nonelectroneutral domain walls. In addition, the consecutive fatigue–recovery cycles elucidate the repeatability and applicability of electric field controlled polarization recovery in ferroelectric capacitors.