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This work reports that introducing lanthanide in the gate dielectric or in the gate electrode results, in both cases, in large effective work function (WF) modulation towards n-type band-edge for Ni-FUSI devices. This is done by: a) deposition of a Dy2O3 capping layer on the host dielectric (SiON or HfSiON), or b) simple Yb implantation of nMOS poly gates prior to FUSI. We show that: 1) both cases...
In this letter, we report that by using a thin dysprosium oxide (Dy2O3)cap layer (~1-nm thick) on top of SiON host dielectrics, the threshold voltage (Vt) of poly-Si/TaN gated n-FETs can be modulated to match that of the reference poly-Si/SiON devices, with a significantly scaled equivalent oxide thickness, a much reduced gate leakage, improved time-zero-break-down characteristics, and a minor degradation...
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