Patent ID: 9570346
Date: 2017-02-14
CPC Classifications: H01L

Claim:
1. A method of manufacturing a semiconductor device, the method comprising: forming an insulating film on a first surface of a semiconductor substrate; forming a contact hole that penetrates the insulating film in a direction of depth and reaches the semiconductor substrate; forming a first metal film from titanium, from a surface of the insulating film to a surface of a semiconductor device region of the semiconductor substrate exposed in the contact hole; forming a second metal film from titanium nitride on a surface of the first metal film; converting the first metal film into a silicide by heat treatment; converting titanium atoms that remain unreacted inside the first metal film and the second metal film into a nitride by a plasma nitriding process; embedding a plug formed from tungsten at an inner side of the second metal film inside the contact hole after the heat treatment and the plasma nitriding process; and forming a surface electrode that includes aluminum as a principal constituent, from a surface of the second metal film on the insulating film to a surface of the plug, wherein converting the first metal film into the silicide by heat treatment is performed at a temperature at which the titanium atoms inside the first metal film and the second metal film do not react with oxygen atoms inside the insulating film.