Patent ID: 7745317
Filing Date: 2010-06-29
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: a first film forming step for forming a metal layer on a first surface of a silicon carbide semiconductor substrate; a second film forming step for forming a second metal layer on a second surface of the silicon carbide semiconductor substrate opposing the first surface, the second metal layer composed of a same metal material as that composing the first metal layer, the metal material comprising molybdenum; and a heat-treating step for simultaneously subjecting the first and second metal layers to a heat treatment in a temperature range of 350° C. to 450° C. after the first and second film forming steps, to form an ohmic junction between the first metal layer and the first surface of the silicon carbide semiconductor substrate as well as to form a Schottky junction between the second metal layer and the second surface of the silicon carbide semiconductor substrate, the first and second film forming steps including the steps of respectively forming the first and second metal layers brought into contact with the silicon carbide semiconductor substrate using a metal material whose silicide formation free energy and carbide formation free energy at the temperature of the silicon carbide semiconductor substrate in the heat-treating step respectively take negative values.