Patent ID: 6531747
Filing Date: 2003-03-11
Classification: H01L

Abstract:
A semiconductor device comprising:a first conductivity type region formed on the main surface of a semiconductor substrate; an element forming region separated on the main surface of said semiconductor substrate by an element isolation film and formed on the surface of said first conductivity type region; a prescribed semiconductor element formed on said element forming region; an insulator film formed on said semiconductor substrate to cover said semiconductor element; and a first contact hole formed in said insulator film for exposing the surface of said element forming region; said semiconductor element having: an electrode part formed across said element forming region, a pair of second conductivity type first impurity regions formed on one side and another side of said element forming region through said electrode part and having a first impurity concentration, and a second conductivity type second impurity region formed on at least one of said first impurity regions to include a contact part of said first contact hole and having a second impurity concentration higher than said first impurity concentration; an etching prevention film different in etching property from said insulator layer is formed between said insulator film and said semiconductor element to cover said electrode part in direct contact with both side surfaces of said electrode part; a second contact hole formed in said insulator film and arranged not to planarly overlap with said electrode part; a second conductivity type third impurity region including a contact part of said second contact hole, formed on another one of said first impurity regions and having a second impurity concentration higher than said first impurity concentration; a third contact hole formed in said insulator film and arranged to planarly overlap with said electrode part; and a second conductivity type fourth impurity region including a contact part of said third contact hole, formed on another one of said first impurity regions and having a second impurity concentration higher than said first impurity concentration, wherein said semiconductor element includes: a first transistor having said electrode part, said pair of first impurity regions, said second impurity region and said third impurity region, and a second transistor having said electrode part, said pair of first impurity regions, said second impurity region and said fourth impurity region, the distance between said third impurity region and a portion immediately under the side surface of said electrode part on the side where said third impurity region is located on the main surface of said semiconductor substrate is longer than the distance between said second impurity region and a portion immediately under the side surface of said electrode part on the side where said second impurity region is located on the main surface of said semiconductor substrate, and the distance between said fourth impurity region and a portion immediately under the side surface of said electrode part on the side where said fourth impurity region is located on the main surface of said semiconductor substrate is substantially identical to the distance between said second impurity region and a portion immediately under the side surface of said electrode part on the side where said second impurity region is located on the main surface of said semiconductor substrate, said first contact hole is arranged to planarly overlap with said electrode part.