Patent ID: 9224732
Filing Date: 2015-12-29
Classification: H01L

Abstract:
1. A method of forming a device, the method comprising: forming a buried well region of a first dopant type in a substrate; forming a well region of the first dopant type over the buried well region; forming a first well region of a second dopant type between the well region of the first dopant type and the buried well region of the first dopant type; forming a second well region of the second dopant type in the well region of the first dopant type; forming an isolation structure at least partially in the well region of the first dopant type; forming a first gate electrode over the isolation structure and the second well region of the second dopant type; forming a third well region of the second dopant type in the well region of the first dopant type, the third well region of the second dopant type being spaced from the second well region of the second dopant type; and forming a second gate electrode at least partially overlapping the second well region of the second dopant type and the third well region of the second dopant type.