Patent ID: 8278711

Claim:
A device comprising: a gate electrode; and a substrate including semiconductor material and having a surface that supports said gate electrode and defines a surface normal direction, said substrate including a drift region including a first dopant type so as to have a first conductivity type; a well region adjacent to said drift region and proximal to said surface, said well region including a second dopant type so as to have a second conductivity type, said well region including a channel region disposed proximal to said gate electrode; a termination extension region disposed adjacent to said well region and extending away from said gate electrode, said termination extension region having an effective concentration of second dopant type that is generally an effective concentration of second dopant type in said well region; and an adjust region disposed adjacent to said surface and between said surface and at least part of said termination extension region, wherein an effective concentration of second dopant type generally decreases when moving from said termination extension region into said adjust region along the surface normal direction.