Patent ID: 7557446
Filing Date: 2009-07-07
Classification: H01L

Abstract:
1. A semiconductor device having a contact structure, said contact structure comprising: a conductor body; an insulation film covering said conductor body; a contact hole penetrating through said insulation film and exposing said conductor body; and a contact plug filling said contact hole and contacting with said conductor body electrically at a bottom part of said contact hole, wherein said conductor body comprises a silicide film, said contact plug comprising a barrier metal film of tungsten nitride extending along a sidewall surface and a bottom surface of said contact hole and a tungsten plug formed over said barrier metal film to fill said contact hole, said barrier metal film having a concentration gradient that decreases a nitrogen concentration with increasing distance from said sidewall surface of said contact hole, and said barrier metal film contacting with said conductor body directly and intimately at a depressed part formed over a surface of said conductor body with a depth of 5-8 nm.