Patent ID: 7034398
Filing Date: 2006-04-25
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate; an active element structure formed on the semiconductor substrate, and having a connection region formed in the surface of the semiconductor substrate; a first insulating film provided on the semiconductor substrate; a contact hole extending from a surface of the first insulating film to the connection region; a contact plug provided in the contact hole; a buried conductive film filled in a clearance formed in the contact plug, consisting of a material different from the contact plug, having a continuous surface without forming a step with the surface of the contact plug, and having a first width in the surface of the buried conductive film and a second width larger than the first width in a deeper position than the surface of the buried conductive film; and a first intervention conductive film interposed between an inner surface of the contact hole and the contact plug, the first intervention conductive film and the buried conductive film consisting substantially of the same material.