Patent ID: 7098497
Filing Date: 2006-08-29
Classification: H01L

Abstract:
1. A semiconductor device comprising: a MOS transistor formed on a semiconductor substrate; an interlayer dielectric film formed on the semiconductor substrate so as to cover the MOS transistor; a contact plug which includes a first conductive film and a buried film, the first conductive film being formed on a side surface and bottom surface of a contact hole made in the interlayer dielectric film, the buried film being formed in a region surrounded by the first conductive film in the contact hole and formed from a material different from that of the first conductive film; a second conductive film formed on the interlayer dielectric film and electrically connected to the first conductive film, the second conductive film burying a part of the region surrounded by the first conductive film in the contact hole, a lower surface of the second conductive film being lower than an upper surface of the first conductive film; a first high-dielectric-constant film formed on the second conductive film; and a third conductive film formed on the first high-dielectric-constant film.