Patent ID: 8298884
Filing Date: 2012-10-30
Classification: H01L

Abstract:
1. A method of forming a semiconductor device comprising: forming an isolation region through a semiconductor layer of a substrate, wherein the isolation region defines a device region of the substrate; forming a gate conductor having a first portion over a channel portion of the semiconductor layer in the device region of the substrate and a second portion over the isolation regions, wherein a first upper surface of the first portion of the gate conductor is separated from the upper surface of the channel portion of the semiconductor layer by a first distance, and a second upper surface of the second portion of the gate conductor is separated from the upper surface of the isolation regions by a second distance, the first distance being greater than the second distance; implanting a first dopant through the gate conductor into the channel portion of the semiconductor layer, wherein the peak concentration of the first dopant is in a first channel implant region that extends from a lower portion of the gate conductor to an upper portion of the semiconductor layer; and implanting a second dopant through the gate conductor into the channel portion of the semiconductor layer, wherein the peak concentration of the second dopant is in a second channel implant region that is present in the lower portion of the semiconductor layer.