Patent ID: 9263456
Filing Date: 2016-02-16
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a semiconductor substrate; a peripheral circuit region including a first transistor, the first transistor including a gate insulating film and a gate electrode on the semiconductor substrate; a memory cell region including a memory cell which includes a second transistor having a trench gate electrode, and a memory element comprising a capacitor electrically connected to the second transistor by a memory contact plug; a first sidewall on a side surface of the gate electrode of the first transistor, the first sidewall including a first insulating film and a second insulating film on the first insulating film and containing a metal oxide different from the first insulating film, the second insulating film not being present over a top of the gate electrode of the first transistor; an interlayer insulating film on the semiconductor substrate; and a contact plug which directly contacts the second insulating film at a top of said first sidewall and penetrates through the interlayer insulating film and reaches the semiconductor substrate, wherein the second insulating film is not present in the second transistor of the memory cell region, and the memory contact plug directly contacts the first insulating film which is present on a second sidewall on a side surface of the gate electrode of the second transistor.