Patent ID: 7525155
Filing Date: 2009-04-28
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a substrate; a volume defined as being an active region, wherein at least part of the active region extends into the substrate; a gate electrode formed over the substrate, wherein at least part of the gate electrode is located in the active region; a spacer formed along edges of the gate electrode; a driven-in first doped region formed in the substrate, wherein boundaries of the first doped region are graded, and wherein a gate-side boundary of the first doped region extends laterally below part of the gate electrode; and a second doped region formed within the first doped region, wherein a gate-side boundary of the second doped region is spaced away from a closest edge of the gate electrode by a first spaced distance, wherein the gate-side boundary of the second doped region is spaced away from a closest edge of the spacer by a second spaced distance, and wherein the first spaced distance is greater than the second spaced distance.