Patent ID: 7598517
Filing Date: 2009-10-06
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a superjunction structure having interleaved regions of first and second semiconductor materials of opposite conductivity type and first and second mobilities, wherein the first and second semiconductor materials are separated by substantially parallel PN junctions and terminated at a first end by a substrate region substantially perpendicular to the PN junctions, wherein the superjunction structure has a second end spaced apart from the first end and wherein the second mobility is higher than the first mobility for the same carrier type; a body regions of a third semiconductor material of a third mobility, coupled to the second end and having an outer surface opposed to the second end; a trench having sidewalls extending from the outer surface at least to the second end; and a fourth material of a fourth mobility higher than the third mobility for the same type of carrier at least on the sidewalls, and communicating with the superjunction structure.