Patent ID: 6380054
Filing Date: 2002-04-30
Classification: H01L

Abstract:
A method for forming a Schottky diode in a wafer having:a semiconductor material having a first conductivity type and a first dopant concentration; a field oxide region formed in the semiconductor material; a first region formed in the semiconductor material, the first region having a second conductivity type and a second dopant concentration; a second region formed in the semiconductor material, the second region having the first conductivity type and a third dopant concentration, the third dopant concentration being substantially greater than the first dopant concentration; a third region defined in the semiconductor material below the field oxide region; and a layer of insulation material formed over the first region, the second region, and the field oxide region, the method comprising the steps of: removing the layer of insulation material to form a first opening that exposes the first region to form an exposed first region, and a second opening that exposes the second region to form an exposed second region, and the layer of insulation material and the field oxide region to form a third opening that exposes the third region to form an exposed third region; forming a layer of barrier material on the layer of insulation material, the exposed first region, the exposed second region, and the exposed third region; and forming a layer of metal over the layer of barrier material.