Patent ID: 8076239
Filing Date: 2011-12-13
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: forming a silicide layer over a semiconductor substrate; forming an insulating film over the silicide layer; forming a hole reaching the silicide layer in the insulating film; forming a titanium layer over a bottom surface and an inner wall surface of the hole, wherein the titanium layer is formed by a chemical vapor deposition, wherein the titanium layer has a thickness of 2 nm to 8 nm over a side wall of the hole; cleaning the surface of the formed titanium layer by annealing the semiconductor substrate in a hydrogen atmosphere after forming the titanium layer without exposing the titanium layer to an atmosphere during a first process for the forming the titanium layer to a second process for the annealing in the hydrogen atmosphere; forming a barrier layer having a thickness of 1 nm to 20 nm by sputtering for preventing copper diffusion over the titanium layer in the hole, wherein the barrier layer is directly formed on the titanium layer after the cleaning; and burying a copper layer in the hole.