Patent ID: 8963296
Filing Date: 2015-02-24
Classification: H01L

Abstract:
1. A trench rectifier comprising: a semiconductor substrate, wherein the substrate has a first surface and a second surface substantially parallel to the first surface; a plurality of first trenches formed in the first surface of the substrate, each of the first trenches having side walls substantially perpendicular to the first surface and a bottom wall substantially parallel to the first surface; a plurality of second trenches formed in the second surface of the substrate, each of the second trenches having side walls substantially perpendicular to the first surface and a bottom wall substantially parallel to the second surface; wherein each of the first trenches comprises a P-type doped region formed in substantially a whole inner surface of each first trench, the P-typed doped regions having a depth adjacent the bottom wall of each of the first trenches extending in a direction perpendicular to the first surface and extending beyond the bottom walls of each of the second trenches; and wherein each of the second trenches comprises an N-type doped region formed in substantially a whole inner surface of each second trench, the N-type doped regions having a depth adjacent the bottom wall of each of the second trenches extending in a direction perpendicular to the second surface and extending beyond the bottom walls of each of the first trenches.