Patent ID: 6384441
Filing Date: 2002-05-07
Classification: H01L

Abstract:
A semiconductor device comprising:first gate electrodes formed on a first region of a semiconductor substrate via a first gate insulating film; first impurity diffusion layers formed between the first gate electrodes and both sides of the first gate electrodes, in the semiconductor substrate; a second gate electrode formed on a second region of the semiconductor substrate via a second gate insulating film; second impurity diffusion layers formed on both sides of the second gate electrode in the semiconductor substrate; a first insulating film for covering upper and side surfaces of the first gate electrodes and covering the semiconductor substrate in a region between the first gate electrodes; sidewalls formed on side faces of the second gate electrode and made of same material as the first insulating film; a second insulating film formed on the first insulating film in the first region and formed on the second gate electrode and the second impurity diffusion layers in the second region; a third insulating film formed on the second insulating film and made of material different from the first insulating film and the second insulating film; a first hole formed between the first gate electrodes and formed to have a depth reaching the first impurity diffusion layer via the first insulating film, the second insulating film, and the third insulating film; a first plug formed of impurity containing semiconductor buried in the first hole; a fourth insulating film formed on the first plug and the third insulating film; a second hole formed in the fourth insulating film, and at least a part of the second hole is formed at a position to overlap with the first plug; a third hole formed in the second, third and fourth insulating films in the second region to have a depth reaching one of the second impurity diffusion layers; a first metal pattern passed through in the second hole and connected electrically to the first plug in the first hole; and a second metal pattern connected to one of the second impurity diffusion layers via the third hole.