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The impact of discrete random dopant fluctuations on 10-nm-long high-performance Schottky-barrier (SB) dopant-segregated (DS) nanowire MOSFETs is investigated through nonequilibrium Green's function quantum simulations. Using DS, nanoscale SB-FETs could outperform standard doped source and drain FETs in terms of ION/IOFF. By reintroducing dopants in SB, however, variability problems are unavoidable and will be strong, at least for thin-width SB-FETs, because of the dopant influence on the SB profile on which the tunneling current is quite sensitive.
Date of Publication: Sept. 2012