An evaluation of super-steep-retrograde channel doping for deep-submicron MOSFET applications

Performance and reliability of deep-submicron MOSFET's employing super-steep-retrograde (SSR) channel doping configurations are examined using self-consistent Monte Carlo and drift-diffusion simulations. It is found that SSR channel doped MOSFET's provide increased current drive and reduced threshold voltage shift when compared with conventional MOSFET structures. However, they also display a relatively higher substrate current and interface state generation rate. The physical mechanisms of performance enhancement/degradation and design tradeoffs for SSR channel doped MOSFET's are discussed.<
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