Patent ID: 6790753
Filing Date: 2004-09-14
Classification: H01L

Abstract:
A method of fabricating a Schottky diode, comprising the steps of:forming a first layer of insulative material having a first etch rate over the surface of a semiconductor substrate; forming a second layer of insulative material having a second etch rate, the second etch rate being greater than the first etch rate, over the first layer of insulative material; etching, in a single etching step, a window through the first and second layers of insulative material to the semiconductor substrate, the window forming walls having a topology of stepped thickness of insulative material due to the etch rates differing; and depositing a metal in the etched window to form a metal-semiconductor substrate contact, the metal conforming to the topology of the walls of the etched first and second layers of insulative material in the window and the semiconductor substrate to form a stepped structure.