Patent ID: 9614039
Date: 2017-04-04
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising: a plurality of first trench gates provided abreast on a semiconductor substrate; a plurality of second trench gates provided in a direction intersecting with the first trench gates; an interlayer insulation film provided on a front surface of the semiconductor substrate, the interlayer insulation film having an opening from which a part of the front surface of the semiconductor substrate is exposed; and a contact plug provided in the opening, wherein the interlayer insulation film comprises a plurality of first portions each of which is provided along a front surface of a corresponding one of the first trench gates to cover the corresponding first trench gate, and lateral portion provided between adjacent first portions and along a direction intersecting with the first portions, the lateral portion comprises a second portion which is provided along the front surface of the semiconductor substrate so as not to cover the first trench gates and the second trench gates, and a plurality of third portions, each of which is provided along a front surface of a corresponding one of the second trench gates to cover the corresponding second trench gate, and the opening is provided at an area surrounded by the first portions and the lateral portion, a length of the opening in a direction along the first portions is shorter than a length of the opening in a direction along the lateral portion intersecting with the first portions and shorter than a length that is twice a film thickness of the lateral portion.