Patent ID: 6538294
Filing Date: 2003-03-25
Classification: H01L

Abstract:
A semiconductor structure for high voltage semiconductor components, comprising:a substrate doped at a first concentration level with a first type of dopant; a sub-layer on the substrate doped at a second concentration level with a second type of dopant opposite to the first type of dopant, the second concentration level being greater than the first concentration level; a highly-doped layer on the sub-layer and doped with the second type of dopant at a third concentration level higher than the second concentration level; an epitaxial layer covering the highly-doped layer and doped with the second type of dopant; and at least one trench extending from the surface of the semiconductor structure through the highly-doped layer to delimit the semiconductor structure into plural components, wherein the sub-layer creates an even electrical field distribution in the plural components thereby increasing a breakdown voltage associated with each of the plural components, and wherein a top concentration of the dopant in the sub-layer is in the range of 5Â·1015 ions/cm3-1017 ions/cm3.