Patent ID: 8822291
Filing Date: 2014-09-02
Classification: H01L

Abstract:
1. A method of forming a device comprising: providing a substrate having a device region, wherein the device region comprises a source region, a gate and a drain region defined thereon; forming a drift well in the substrate adjacent to a second side of the gate, the drift well underlaps a portion of the gate with a first edge of the drift well beneath the gate, wherein the drift well comprises first polarity type dopants; forming a secondary portion in the drift well, the secondary portion underlaps a portion of the gate with a first edge of the secondary portion beneath the gate, wherein the first edge of the secondary portion is offset from the first edge of the drift well, and wherein the secondary portion comprises neutral dopants; and wherein a gate dielectric of the gate comprises a first portion having a first thickness and a second portion having a second thickness, wherein the second portion is over the secondary portion.