Patent ID: 9577082
Date: 2017-02-21
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising: a semiconductor substrate; a plurality of trenches provided abreast on a front surface of the semiconductor substrate; a plurality of gate insulation films, each gate insulation film covering an inner surface of a corresponding one of the trenches; a plurality of gate electrodes, each gate electrode being provided in the corresponding trench and insulated from the semiconductor substrate by a corresponding one of the gate insulation films; a plurality of interlayer insulation films, each interlayer insulation film covering a front surface of a corresponding one of the gate electrodes and protruding from the front surface of the semiconductor substrate; a metal film covering the front surface of the semiconductor substrate and plurality of the interlayer insulation films; and a protective insulation film covering a part of the metal film, wherein in a cross-section traversing the plurality of trenches, an end of the protective insulation film is above one of the interlayer insulation films, and a width of the one of the interlayer insulation films that is below the end of the protective insulation film is wider than widths of other interlayer insulation films.