A low gate leakage current and small equivalent oxide thickness MOSFET with Ti/HfO2 high-k gate dielectric
Annealing effects on electrical characteristics and reliability of MOS device with HfO2 or Ti/HfO2 high-k dielectric are studied in this work. For the sample with Ti/HfO2 higher-k dielectric after a post-metallization annealing (PMA) at 600C, its equivalent oxide thickness value is 7.6 and the leakage density is about 4.510?2A/cm2. As the PMA is above 700C, the electrical characteristics of MOS device would be severely degraded.
ti hfo2 gate dielectric higher-k eot