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We have successfully suppressed threshold voltage variations due to pattern effect problems and random dopant fluctuation (RDF) using an integrated FSP-FLA technology. The serious problem of the pattern effect in FLA can be solved by using a light-absorber carbon film process, together with FSP-FLA. We estimated the temperature range in our test chip was within 10°C, being the same level obtained with spike RTA. In addition, the diffusion-less feature of FLA reduces the RDF of NMOS down to the same level as with PMOS. By applying several optimized processes, including a high-k/metal gate stack, we achieved AVT as 1.3mVμm for NMOS and 1.2mVμm for PMOS.
VLSI Technology (VLSIT), 2010 Symposium on
Date of Conference: 15-17 June 2010