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High performance sub-35 nm bulk CMOS with hybrid gate structures of NMOS ; Dopant Confinement Layer (DCL) / PMOS ; Ni-FUSI by using Flash Lamp Anneal (FLA) in Ni-silicidation

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10 Author(s)

We applied flash lamp annealing (FLA) in Ni-silicidation to our developed dopant confinement layer (DCL) structure for the first time. DCL technique is a novel stress memorization technique (SMT). We successfully improved the short channel effect (SCE) with keeping a high drive current by FLA in Ni-silicidation. For pMOSFET, 2 layers Ni fully-silicide (Ni-FUSI) was selectively formed on gates, and both effective work function (WF) control and thinner Teff are improved. On the other hand, unlike pMOS, Ni-FUSI process is not performed in nMOS. Both higher activation of halo and reduction of parasitic resistance in nMOSFET are improved by the combination of DCL structure and FLA in Ni-silicidation. Consequently, the higher drive currents of 1255 muA/mum and 759 muA/mum were obtained Ioff=122 nA/mum and 112 nA/mum at |Vdd|=1.0 V for nMOSFET and pMOSFET, respectively.

Published in:

VLSI Technology, 2008 Symposium on

Date of Conference:

17-19 June 2008