Patent ID: 6667513
Filing Date: 2003-12-23
Classification: H01L

Abstract:
A semiconductor device, comprising:a semiconductor substrate having a predetermined concentration, Ns, of a dopant of a first conductivity type; a source region and a drain region doped with a dopant of a second conductivity type; junctions, wherein the junctions delimit a channel region of a predetermined length, LN, in the substrate, wherein the junctions are defined by the source region and the drain region; first pockets located adjacent to each of the junctions, wherein the pockets have a predetermined length, Lp, wherein the first pockets are doped with a dopant of the first conductivity type with a dopant concentration, Np, which locally increases a net concentration in the substrate above Ns; second pockets located adjacent to each of the junctions and stacked against each of the first pockets, wherein the second pockets have a length, Ln, such that Ln is greater than Lp, and wherein the second pockets are doped with a dopant of the second conductivity type with a dopant concentration, Nn, such that Nn is less than Np, which locally decreases a net concentration without changing a conductivity type, and wherein Nn is less than Ns; and wherein an overall length of the first pockets and the second pockets is less than the length, LN, of the channel region.