Patent ID: 7479444
Filing Date: 2009-01-20
Classification: H01L

Abstract:
1. A method for forming an ohmic contact and a Schottky diode in an integrated circuit, comprising: providing a semiconductor substrate; forming first and second diffusion regions in the semiconductor substrate; forming an insulating layer on the semiconductor substrate; forming a first contact opening in the insulating layer to expose the semiconductor substrate, the first contact opening being formed over the first diffusion region; forming a barrier metal layer on the insulating layer and in the first contact opening; forming a second contact opening in the barrier metal layer and the insulating layer to expose the semiconductor substrate, the second contact opening being formed over the second diffusion region; forming a metal layer of a first type on the barrier metal layer and the insulating layer and in the first and second contact openings, the metal layer comprising a metal that forms a Schottky barrier junction with the semiconductor substrate; and patterning the metal layer to form the ohmic contact over the first diffusion region and the Schottky diode over the second diffusion region.