Patent ID: 7115999
Filing Date: 2006-10-03
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 a surface of the semiconductor substrate; an insulating film formed on the semiconductor substrate; a connection hole formed in the insulating film, having a bottom connected with the connection region, and including a first region and a second region formed over the first region; an interconnect trench formed in the insulating film, and having a bottom connected with the connection hole; a first conductive film filled in the first region of the connection hole, and consisting of an alloy containing CoW or NiW; a second conductive film filled in the interconnect trench and the second region of the connection hole, and contacting with the first conductive film; and a first diffusion prevention film formed between an inner surface of the interconnect trench and the second conductive film, between a side surface of the connection hole in the second region and the second conductive film and on the first conductive film.