Patent ID: 7355224
Filing Date: 2008-04-08
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate; a drain region in said semiconductor substrate; a source region in said semiconductor substrate laterally spaced from said drain region; a drift region in said semiconductor substrate between said drain region and said source region; wherein said drift region includes first, second, and third layers laying in parallel planes and of a first conductivity type, a fourth layer intermediate said first and second layers, said fourth layer including a first set of alternating pillars laying in a plane substantially orthogonal to said parallel planes, said first set of alternating pillars of said first conductivity type and of a second conductivity type extending between said source and drain regions; and wherein said drift region includes a fifth layer intermediate said second and third layers, said fifth layer including a second set of alternating pillars laying in a plane substantially orthogonal to said parallel planes, said second set of alternating pillars of said first conductivity type and of said second conductivity type extending between said source and drain regions.