Patent ID: 8410546
Filing Date: 2013-04-02
Classification: H01L,H02M,Y02B

Abstract:
1. A semiconductor device comprising: a semiconductor substrate of a first conductivity type; a semiconductor layer of a second conductivity type provided in part of an upper portion of the semiconductor substrate; a semiconductor region of the first conductivity type provided in part of an upper portion of the semiconductor layer; a first trench formed from an upper surface side of the semiconductor region, penetrating through the semiconductor region and the semiconductor layer, and reaching the semiconductor substrate; a second trench formed in the semiconductor substrate and outside the semiconductor layer from an upper surface side of the semiconductor substrate; a gate dielectric film formed on an inner surface of the first trench; a trench gate electrode provided on the gate dielectric film; a capacitive dielectric film formed on an inner surface of the second trench; a trench source electrode provided on the capacitive dielectric film; a dielectric film that overlaps an upper surface of a portion of the semiconductor substrate in which the second trench is formed; a drain electrode provided on a lower surface of the semiconductor substrate; and a source electrode provided on an upper surface of the semiconductor layer, the trench source electrode extending in a direction parallel to the upper surface of the semiconductor substrate and being connected to the source electrode through a portion of the trench source electrode extending in the parallel direction, wherein end portions of the trench source electrode in the parallel direction are connected to the source electrode.