Patent ID: 7737468
Filing Date: 2010-06-15
Classification: H01L

Abstract:
1. A transistor, comprising: a workpiece; a channel region formed within the workpiece; a gate dielectric disposed over the channel region; a gate disposed over the gate dielectric; a source region disposed within the workpiece proximate a first side of the channel region; a drain region disposed within the workpiece proximate a second side of the channel region, the source region and the drain region comprising a first semiconductive material in a lower portion and in an upper portion at least adjacent to the channel region, the source region and the drain region further comprising a second semiconductive material disposed over the first semiconductive material in the lower portion, the second semiconductive material being different than the first semiconductive material, the first semiconductive material comprising a first thickness in a central region, the second semiconductive material comprising a second thickness, wherein the first thickness is equal to or greater than the second thickness; and a silicide disposed over and contacting the first and the second semiconductive material.