Patent ID: 7656003
Filing Date: 2010-02-02
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a semiconductor substrate having a first surface and a second surface; an electrical stress protection device, wherein the electrical stress protection device comprises: a doped region having a first surface over the first surface of the semiconductor substrate; and a dielectric structure, wherein at least a portion of the dielectric structure is in a region separated from the doped region and is below a plane that is substantially coplanar to the first surface of the doped region, wherein the portion of the dielectric structure below the plane has a height of at least about three microns and a width of at least about five microns; wherein the semiconductor device is an integrated circuit comprising the electrical stress protection device and a field effect transistor (FET), wherein the FET has a gate, a gate oxide layer under at least a portion of the gate, a source region, a drain region, and a channel region between the source region and the drain region and below the gate oxide layer and wherein the dielectric structure is between the doped region of the electrical stress protection device and the channel region of the FET; wherein the semiconductor substrate is a p-type semiconductor substrate and further comprising: a p-type epitaxial semiconductor material over the semiconductor substrate, wherein the doping concentration of the p-type epitaxial semiconductor material is less than the doping concentration of the p-type semiconductor substrate; a first n-type semiconductor material over the p-type epitaxial semiconductor material; a second n-type semiconductor material over the first n-type semiconductor material, wherein the doping concentration of the second n-type epitaxial semiconductor material is less than the doping concentration of the first n-type semiconductor material, wherein the first surface of the doped region is substantially coplanar to a first surface of the second n-type semiconductor material and wherein at least a portion of the dielectric structure extends from the plane into the semiconductor substrate.