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A 1.4 nm EOT stack film of HfSiON with interfacial oxide layer (IL) is demonstrated with excellent electrical characteristics and reliability for 45 nm node low-power technology. Mobility comparable to SiON is achieved along with adequate nMOS PBTI lifetime, TDDB lifetime, and breakdown voltage (VBD). For the first time, we report lower VBD for the HfSiON stack film despite of 3 orders gate leakage...
Positive bias and temperature (PBTI) stress induced drain current degradation in HfSiON gate dielectric nMOSFETs is investigated by using a transient measurement technique. The degradation exhibits two stages, featuring different degradation rate and stress temperature dependence. The drain current degradation in the first stage is attributed to the charging of pre-existing high-k dielectric traps...
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