Patent ID: 8435873

Claim:
An unguarded Schottky barrier diode comprising: a dielectric layer formed over a silicon cathode with a window opening formed in the dielectric layer through which a portion of the silicon cathode is exposed; a recessed region formed in the silicon cathode through the window opening having a central portion onto which the window opening opens, and having a peripheral etched undercut portion spaced below the window opening and extending laterally undercutting the dielectric layer; a silicide formed in substantial conformity within the recessed region including in the peripheral portion undercutting the dielectric layer; and an anode contact formed in electrical communication with the silicide formed within the central portion of the recessed region and separated by an undercut part of the dielectric layer from the silicide formed within the peripheral portion of the recessed region, wherein the sidewalls of the window are concave, wherein a tail of the dielectric layer which is also concave extends beyond an interface of the dielectric interface and the cathode, and wherein the tail is further sandwiched between the silicide layer and a diffusion metal layer to separate the diffusion metal layer from silicide within the peripheral portion of the recessed region; thereby preventing the formation of a metal-insulator-semiconductor diode, wherein no other layers are interposed between the cathode and dielectric layer and the tail of the dielectric layer.