Patent ID: 6238989
Filing Date: 2001-05-29
Classification: H01L

Abstract:
A salicide process, comprising:forming lightly doped source/drain regions in a silicon substrate below a gate having sidewalls, to define a channel region in the substrate beneath the gate, wherein the lightly doped source/drain regions have a first dose concentration;forming spacers on the sidewalls of the gate;implanting ions into the substrate by using the gate and the spacers as a mask, thereby forming heavy doped source/drain regions in the substrate, the heavy doped source/drain regions having a second dose concentration higher than the first dose concentration;selectively growing an epitaxial film of silicon on the heavy doped source/drain regions and the gate, wherein the epitaxial film near the spacers has a portion substantially thinner than other portion of the epitaxial film, and wherein the portion of the epitaxial film has facets thereon; andperforming a silicide reacting step, thereby reacting the epitaxial film with a metal film until the thinner portion of the epitaxial film is wholly consumed, to selectively form silicides on the gate and the source/drain regions.