Patent ID: 7192862
Filing Date: 2007-03-20
Classification: H01L

Abstract:
1. A manufacturing method of a semiconductor device comprising the steps of: forming a first impurity diffusion layer and a second impurity diffusion layer in a semiconductor substrate in a first region; forming a third impurity diffusion layer in the semiconductor substrate in a second region; forming a first insulating film that covers the first impurity diffusion layer, the second impurity diffusion layer, and the third impurity diffusion layer over the semiconductor substrate; forming a first hole and a second hole over the first impurity diffusion layer and the second impurity diffusion layer respectively by patterning the first insulating film in the first region; forming a first conductive plug and a second conductive plug in the first hole and the second hole respectively; forming a wiring, which is connected electrically to the first conductive plug, on the first insulating film; forming a third hole, which have a depth to reach the third impurity diffusion layer, by patterning the first insulating film in the second region; forming a third conductive plug in the third hole; forming a second insulating film over the third conductive plug, the wiring, and the first insulating film; forming a third insulating film, which is made of material different from the second insulating film, over the second insulating film; forming a fourth hole, at least a part of which overlaps with the third conductive plug, in the second region by patterning the third insulating film while using the second insulating film as an etching stopper layer; exposing an upper surface of the third conductive plug by etching selectively the second insulating film through the fourth holes; and forming a fourth conductive plug, which is connected to the upper surface of the third conductive plug, in the fourth hole.