Ferroelectricity in HfO2 enables nonvolatile data storage in 28 nm HKMG

We report on the most aggressively scaled ferroelectric field effect transistor so far. These were successfully fabricated using ferroelectric Si:HfO
₂
in a 28 nm HKMG stack (TiN/Si:HfO
₂
/SiO
₂
/Si). For a ± 5 V program/erase operation with pulses as short as 20 ns, reliable threshold voltage shifts were observed resulting in a memory window of about 0.9 V. We further demonstrate endurance characteristics matching demands of current nonvolatile memories utilizing wear leveling. Low retention loss was observed and extrapolated 10-year data storage can be expected.