Patent ID: 8138073

Claim:
A method for forming a metal-semiconductor Schottky contact in a well region, the method comprising: forming shallow trench isolation in the well region to form a first well region separated from a second well region by the shallow trench isolation; forming a first insulating layer overlying the shallow trench isolation, the first well region, and the second well region; removing a portion of the first insulating layer such that only the first well region and a portion of the shallow trench isolation is covered by a remaining portion of the first insulating layer; forming a highly doped region in the second well region; siliciding a top portion of the highly doped region to form a silicide layer; forming a second insulating layer overlying the remaining portion of the first insulating layer and the silicide layer; using a contact mask, forming a contact opening in the second insulating layer and the remaining portion of the first insulating layer to expose a portion of the first well region; and forming the metal-semiconductor Schottky contact in the exposed portion of the first well region by forming a metal layer in at least a portion of the contact opening and annealing the metal layer.