Patent ID: 7898014
Filing Date: 2011-03-01
Classification: H01L

Abstract:
1. A semiconductor device structure formed in a trench defined in a substrate of a semiconductor material by a sidewall extending from a top surface of the substrate to a base, the semiconductor device structure comprising: a first doped layer disposed in the trench, the first doped layer containing a dopant having a first conductivity type; a second doped layer disposed in the trench between the first doped layer and the top surface, the second doped layer containing a dopant having a second conductivity type opposite to the first conductivity type; a first doped region and a second doped region each defined in the semiconductor material of the substrate bordering the sidewall of the trench, the first and second doped regions having the first conductivity type, the first doped region positioned relative to the top surface at substantially the same depth as the first doped layer, and the second doped region positioned between the first doped region and the top surface; a third doped region defined in the semiconductor material of the substrate bordering the sidewall of the trench, the third doped region positioned relative to the top surface at substantially the same depth as the second doped layer so that at least a portion of the third doped region is disposed between the first doped region and the second doped region, and the third doped region having the second conductivity type; and an intervening region of the semiconductor material of the substrate bordering the sidewall of the trench and disposed relative to the top surface between the second doped region and the third doped region.