Patent ID: 7569429

Claim:
A method for fabricating an antifuse, said method comprising steps of: forming a contact and/or via hole in an insulating layer on an underlying conductive layer; forming a lower metal layer that contacts inner surfaces of the contact and/or via hole and a top surface of the insulating layer and that partially fills said contact and/or via hole; forming a filling layer on the lower metal layer, wherein the filling layer partially fills the contact and/or via hole such that a recess having a predetermined depth is formed in said contact and/or via hole; forming an antifuse material layer that contacts an upper surface of the filling layer and an inner surface of the lower metal layer in said contact and/or via hole, wherein the antifuse material layer contacts the lower metal layer at both an external region and an internal region of said contact and/or via hole; and forming an upper metal layer on the antifuse material layer.