Endurance > 1011 Cycling of 3D GAA Nanosheet Ferroelectric FET with Stacked HfZrO2 to Homogenize Corner Field Toward Mitigate Dead Zone for High-Density eNVM

Abstract

After 1011 high endurance cycles with memory window (MW) =0.9 V is achieved for the 3D gate-all-around (GAA) nanosheet (NS) ferroelectric field-effect transistor (FeFET) based on double-HZO; the aim is to homogenize the corner field and mitigate dead zones. The interlayer Al2O3 or TiN in the double-HZO exhibits MW enhancement or low access voltage, respectively. The proposed MFMFS GAA-FeFET demonstrates a low VP/E = ±3.5 V (±2.3 MV/cm), large MW = 1.3 V, >1011 robust endurance cycles, and stable storage with data retention of >2×104 s; therefore, physical dimension scaling of the embedded nonvolatile memory (eNVM) is feasible for future generations.