Endurance beyond 10 billion cycles in wurtzite ferroelectrics by confining nitrogen vacancies

Le résumé fourni par la source

Wurtzite ferroelectrics could provide a route to wafer-scale integrated ferroelectric memories but are limited by endurance, typically failing at ~10 8 cycles. We identified nitrogen-vacancy ( V N ) clustering and long-range percolative migration as the defect-mediated pathways that drive leakage-current growth and dielectric breakdown. We combined a spatially engineered aluminum scandium nitride/aluminum nitride (AlScN/AlN) superlattice with a dynamic recovery protocol to spatially and energetically confine V N evolution that stabilized defect topology under cyclic electrical stress and suppressed hard breakdown and ferroelectric degradation. We demonstrated endurance beyond 10 10 cycles in wurtzite ferroelectrics under a complete-switching criterion (remnant polarization ≥ 100 microcoulombs per square centimeter). These findings establish V N confinement as a scalable defect-topology framework that couples atomic-scale defect stability to reliable ultradense ferroelectric memories and provide guidance for next-generation nonvolatile memory technologies.

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